USAP-DC

{"dp_type": "Project", "free_text": "Gondwana"}

[{"awards": "2203487 Ben Mansour, Walid", "bounds_geometry": "POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))", "dataset_titles": null, "datasets": null, "date_created": "Mon, 06 Jun 2022 00:00:00 GMT", "description": "The thermochemical structure of the lithosphere beneath Antarctica is fundamental for understanding the geological evolution of the continent and its relationship to surrounding Gondwana continents. In addition, the thermal structure controls the solid earth response to glacial unloading, with important implications for ice sheet models and the future of the West Antarctic Ice Sheet. However, it is challenging to get an accurate picture of temperature and composition from only sparse petrological/geochemical analysis, and most previous attempts to solve this problem geophysically have relied on seismic or gravity data alone. Here, we propose to use a probabilistic joint inversion (high resolution regional seismic data, satellite gravity data, topography) and petrological modelling approach to determine the 3D thermochemical structure of the mantle. The inversion will be carried out using a Markov-chain Bayesian Monte Carlo methodology, providing quantitative estimates of uncertainties. Mapping the 3-D thermochemical structure (thermal and composition) will provide a comprehensive view of the horizontal (50-100 km resolution) and vertical (from the surface down to 380 km) variations. This new model will give us the temperature variation from the surface down to 380 km and the degree of depletion of the lithospheric mantle and the sub-lithospheric mantle. This new model will also be compared to recent models of Gondwana terranes 200 Myrs to build a new model of the thermochemical evolution of the cratonic mantle. The new thermal and chemical structures can be used to better understand the geothermal heat flux beneath the ice sheet as well as improve glacial isostatic adjustment and ice sheet models.", "east": 180.0, "geometry": "POINT(0 -89.999)", "instruments": null, "is_usap_dc": true, "keywords": "Antarctica; GRAVITY FIELD; AMD; COMPUTERS; GEOCHEMISTRY; PLATE BOUNDARIES; Amd/Us; SEISMIC SURFACE WAVES; USA/NSF; USAP-DC", "locations": "Antarctica", "north": -60.0, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Ben-Mansour, Walid; Wiens, Douglas", "platforms": "OTHER \u003e MODELS \u003e COMPUTERS", "repositories": null, "science_programs": null, "south": -90.0, "title": "Thermal and Compositional Structure of Antarctica from Probabilistic Joint Inversion of Seismic, Gravity, and Topography Data and Petrological Modelling", "uid": "p0010334", "west": -180.0}, {"awards": "1443557 Isbell, John", "bounds_geometry": "POLYGON((-180 -85,-177.1 -85,-174.2 -85,-171.3 -85,-168.4 -85,-165.5 -85,-162.6 -85,-159.7 -85,-156.8 -85,-153.9 -85,-151 -85,-151 -85.2,-151 -85.4,-151 -85.6,-151 -85.8,-151 -86,-151 -86.2,-151 -86.4,-151 -86.6,-151 -86.8,-151 -87,-153.9 -87,-156.8 -87,-159.7 -87,-162.6 -87,-165.5 -87,-168.4 -87,-171.3 -87,-174.2 -87,-177.1 -87,180 -87,179 -87,178 -87,177 -87,176 -87,175 -87,174 -87,173 -87,172 -87,171 -87,170 -87,170 -86.8,170 -86.6,170 -86.4,170 -86.2,170 -86,170 -85.8,170 -85.6,170 -85.4,170 -85.2,170 -85,171 -85,172 -85,173 -85,174 -85,175 -85,176 -85,177 -85,178 -85,179 -85,-180 -85))", "dataset_titles": "A LITHOFACIES ANALYSIS OF A SOUTH POLAR GLACIATION IN THE EARLY PERMIAN: PAGODA FORMATION, SHACKLETON GLACIER REGION, ANTARCTICA; A new stratigraphic framework built on U-Pb single-zircon TIMS agesand implications for the timing ofthe penultimate icehouse (Paran\u00e1 Basin, Brazil); Constraining late Paleozoic ice extent in the Paganzo Basin of western Argentina utilizing U-Pb detrital zircon geochronology for the lower Paganzo Group strata; Coupled stratigraphic and U-Pb zircon age constraints on the late Paleozoic icehouse-to-greenhouse turnover in south-central Gondwana; Isotopes to ice: Constraining provenance of glacial deposits and ice centers in west-central Gondwana; Late Permian soil-forming paleoenvironments on Gondwana: A review; Provenance of late Paleozoic glacial/post-glacial deposits in the eastern Chaco-Paran\u00e1 Basin, Uruguay and southernmost Paran\u00e1 Basin, Brazil; Supplemental material: Nitrogen-fixing symbiosis inferred from stable isotope analysis of fossil tree rings from the Oligocene of Ethiopia; When does large woody debris influence ancient rivers? Dendrochronology\r\napplications in the Permian and Triassic, Antarctica", "datasets": [{"dataset_uid": "200266", "doi": "10.2110/jsr.2021.004", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "A LITHOFACIES ANALYSIS OF A SOUTH POLAR GLACIATION IN THE EARLY PERMIAN: PAGODA FORMATION, SHACKLETON GLACIER REGION, ANTARCTICA", "url": "https://www.sepm.org/publications"}, {"dataset_uid": "200274", "doi": "10.1130/G39213.1", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "Supplemental material: Nitrogen-fixing symbiosis inferred from stable isotope analysis of fossil tree rings from the Oligocene of Ethiopia", "url": "https://pubs.geoscienceworld.org/gsa/geology/article-standard/45/8/687/207623/Nitrogen-fixing-symbiosis-inferred-from-stable"}, {"dataset_uid": "200273", "doi": "10.1016/j.palaeo.2018.04.020", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "Isotopes to ice: Constraining provenance of glacial deposits and ice centers in west-central Gondwana", "url": "https://www.sciencedirect.com/science/article/abs/pii/S0031018217309008?via%3Dihub"}, {"dataset_uid": "200272", "doi": "10.1016/j.jsames.2020.102899", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "Constraining late Paleozoic ice extent in the Paganzo Basin of western Argentina utilizing U-Pb detrital zircon geochronology for the lower Paganzo Group strata", "url": "https://www.sciencedirect.com/science/article/pii/S0895981120304429?via%3Dihub#mmc1"}, {"dataset_uid": "200271", "doi": "10.1016/j.palaeo.2019.109544", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "When does large woody debris influence ancient rivers? Dendrochronology\r\napplications in the Permian and Triassic, Antarctica", "url": "https://www.sciencedirect.com/science/article/abs/pii/S0031018219304006?via%3Dihub"}, {"dataset_uid": "200270", "doi": "10.1016/j.jsames.2020.102989", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "Provenance of late Paleozoic glacial/post-glacial deposits in the eastern Chaco-Paran\u00e1 Basin, Uruguay and southernmost Paran\u00e1 Basin, Brazil", "url": "https://www.sciencedirect.com/science/article/pii/S0895981120305320#mmc1"}, {"dataset_uid": "200269", "doi": "10.1130/G46740.1", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "Coupled stratigraphic and U-Pb zircon age constraints on the late Paleozoic icehouse-to-greenhouse turnover in south-central Gondwana", "url": "https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Coupled_stratigraphic_and_U-Pb_zircon_age_constraints_on_the_late_Paleozoic_icehouse-to-greenhouse_turnover_in_south-central_Gondwana/12542069"}, {"dataset_uid": "200268", "doi": "10.1130/B31775.1.", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "A new stratigraphic framework built on U-Pb single-zircon TIMS agesand implications for the timing ofthe penultimate icehouse (Paran\u00e1 Basin, Brazil)", "url": "https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_A_new_stratigraphic_framework_built_on_U-Pb_single-zircon_TIMS_ages_and_implications_for_the_timing_of_the_penultimate_icehouse_Paran_Basin_Brazil_/12535916"}, {"dataset_uid": "200267", "doi": "10.1016/j.palaeo.2021.110762", "keywords": null, "people": null, "repository": "Publication", "science_program": null, "title": "Late Permian soil-forming paleoenvironments on Gondwana: A review", "url": "https://www.sciencedirect.com/science/article/abs/pii/S0031018221005472?via%3Dihub"}], "date_created": "Fri, 31 Dec 2021 00:00:00 GMT", "description": "The research focus of this collaborative proposal was to collect fossil plants, fossil wood, stratigraphic, sedimentologic, paleosol, and geochemical data from plants and the rocks that contain them in order to reconstruct the extent of the Gondwana glaciation in the Shackleton Glacier (SHK) area, the invasion and subsequent flourishing of life following glacial retreat, changes to the physical environment, and the eventual recovery of plant life after the Late Permian biotic events. Only in Antarctica does a complete polar-to-near-polar succession occur across this climatic and biologic transition. The SHK is an important one as it is one of the few regions in the world where the Permian-Triassic boundary (PTB) is exposed within terrestrial rocks. In addition, outcrops in the SHK area extend from the glacigenic deposits of the Upper Carboniferous-Lower Permian through to the Upper Triassic and thus record ecosystems and the plants that inhabited them from the Gondwana icehouse into the Late Permian-Early Triassic greenhouse and into presumed \"full recovery\" of floras from the PTB extinctions in the Late Triassic.\r\n\r\nThe project encompassed a multidisciplinary plan that used various types of paleobotanical expertise, integrated with detailed sedimentology, stratigraphy, and geochemistry, in order to reconstruct Permian-Triassic plant communities and their paleoenvironments. This interdisciplinary approach is a powerful tool to uncover details of Antarctica\u2019s complex late Paleozoic and Mesozoic environmental, climatic, and biotic history which included: 1) glaciation/deglaciation, 2) development and evolution of a post-glacial landscape and biota, 3) environmental and biotic change associated with the end-Permian mass extinction events, 4) earliest ecosystems in the Triassic, 5) greenhouse conditions in the Triassic, 6) full \u2019recovery\u2019 of floras and ecosystems by the Late Triassic, and, through all of these events, 7) development and changes in a foreland basin system. Three interrelated focus areas, each delimited by distinct hypotheses and action strategies, provided the framework to trace floral diversity and environmental evolution after the retreat of glaciers through to the Late Triassic. Antarctica is the only place on Earth that includes extensive outcrops of high-paleolatitude terrestrial rocks, combined with widespread and well-preserved plant fossils, and that spans this crucial time.\r\n\r\nThe research and broader impacts of this proposal were integrated into action strategies that have been successful in the past. Compression floras were collected (constrained by stratigraphy) both quantitatively and qualitatively in order to obtain biodiversity and abundance data, and as a data source for paleoecological analysis. Even in formations where megafossils were unknown (e.g., Lower Permian), fossil wood is present so that anatomy and geochemistry of tree rings were examined. Standard sedimentologic and stratigraphic analyses were performed, as well as paleosol analyses, including mineralogic and major- and trace-element geochemistry. Collections will also be made for U-Pb zircon geochronology to better constrain geologic and biotic events.\r\n\r\nThe Broader Impacts of the project involved education and outreach initiatives that included women and under-represented groups in the excitement of Antarctic earth sciences: 1) Continuing successful public outreach, teaching, and mentoring of women and under-represented students in Antarctic research; 2) Participation in workshops for under-represented groups via the Expanding Your Horizons Program in Kansas, the TRIO program (KU), and the STELAR summer workshop (UWM) for high-school students. 3) Outreach via the KU Natural History Museum; 4) Exploring Antarctic geosciences through continued presentations to pre K-12 school groups, and field and lab activities at UWM, as well as links from McMurdo Station and satellite conferences from the field with K-12 science classes in Wisconsin and Illinois.", "east": 170.0, "geometry": "POINT(-170.5 -86)", "instruments": null, "is_usap_dc": true, "keywords": "Shackleton Glacier; SEDIMENTARY ROCKS; GLACIATION", "locations": "Shackleton Glacier", "north": -85.0, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Isbell, John", "platforms": null, "repo": "Publication", "repositories": "Publication", "science_programs": null, "south": -87.0, "title": "Collaborative Research: Permian and Triassic Icehouse to Greenhouse Paleoenvironments and Paleobotany in the Shackleton Glacier Area, Antarctica", "uid": "p0010287", "west": -151.0}, {"awards": "9615832 Blankenship, Donald; 9615704 Bell, Robin", "bounds_geometry": "POLYGON((-180 -74,-176 -74,-172 -74,-168 -74,-164 -74,-160 -74,-156 -74,-152 -74,-148 -74,-144 -74,-140 -74,-140 -75.6,-140 -77.2,-140 -78.8,-140 -80.4,-140 -82,-140 -83.6,-140 -85.2,-140 -86.8,-140 -88.4,-140 -90,-144 -90,-148 -90,-152 -90,-156 -90,-160 -90,-164 -90,-168 -90,-172 -90,-176 -90,180 -90,174 -90,168 -90,162 -90,156 -90,150 -90,144 -90,138 -90,132 -90,126 -90,120 -90,120 -88.4,120 -86.8,120 -85.2,120 -83.6,120 -82,120 -80.4,120 -78.8,120 -77.2,120 -75.6,120 -74,126 -74,132 -74,138 -74,144 -74,150 -74,156 -74,162 -74,168 -74,174 -74,-180 -74))", "dataset_titles": "SOAR-PPT Airborne gravity data; SOAR-WLK Airborne gravity data", "datasets": [{"dataset_uid": "601293", "doi": "10.15784/601293", "keywords": "Aerogeophysics; Airborne Gravity; Airplane; Antarctica; Free Air Gravity; Glaciers/ice Sheet; Glaciers/Ice Sheet; Gravimeter; Gravity; Gravity Data; Potential Field; Solid Earth; Transantarctic Mountains", "people": "Bell, Robin", "repository": "USAP-DC", "science_program": null, "title": "SOAR-WLK Airborne gravity data", "url": "https://www.usap-dc.org/view/dataset/601293"}, {"dataset_uid": "601292", "doi": "10.15784/601292", "keywords": "Aerogeophysics; Airborne Gravity; Airplane; Antarctica; Free Air Gravity; Glaciers/ice Sheet; Glaciers/Ice Sheet; Gravimeter; Gravity; Gravity Data; Potential Field; Solid Earth; Transantarctic Mountains", "people": "Bell, Robin", "repository": "USAP-DC", "science_program": null, "title": "SOAR-PPT Airborne gravity data", "url": "https://www.usap-dc.org/view/dataset/601292"}], "date_created": "Fri, 24 Apr 2020 00:00:00 GMT", "description": "Continental extension produces a great variety of structures from the linear narrow rifts of the East African Rift to the diffuse extension of the Basin and Range Province of the Western U.S. Rift shoulder uplift varies dramatically between rift flanks. The cause of variable rift width and crustal thinning is fairly well explained by variable initial heat flow and crustal thickness. Mechanical stretching of the lithosphere has been linked to rift shoulder uplift but the cause of variable rift flank uplift remains poorly understood. The Transantarctic Mountains (TAM) are an extreme example of rift flank uplift, extending over 3500 km across Antarctica and reaching elevations up to 4500 m and thus constitute a unique feature of EarthOs crust. The range was formed in the extensional environment associated with the Mesozoic and Cenozoic breakup of Gondwanaland. Geological and geophysical work has shown that the TAM developed along the long-lived lithospheric boundary between East and West Antarctica reactivated by a complex history of extensional and translational microplate motions. The TAM are not uniform along strike. Along the OWilkes FrontO, the northern segment of the rift extends from North Victoria Land to Byrd Glacier. The Wilkes Front architecture consists of (1) thin, extended crust forming the Victoria Land Basin in the Ross Sea, (2) the TAM rift shoulder, and (3) a long-wavelength down- ward forming the Wilkes Basin. Contrasting structures are mapped along the OPensacola/PoleO Front, the southern segment of the rift extending from the Nimrod Glacier to the Pensacola Mountains. Along this southern section no rift basin has been mapped to date and the down-ward along the East Antarctic, or ObacksideO, edge of the mountains is less pronounced. A flexural model linking the extension in the Ross Sea to the formation of both the mountains and the Wilkes Basin has been considered as a me chanism for uplift of the entire mountain range. The variability in fundamental architecture along the TAM indicates that neither a single event nor a sequence of identical events produced the rift flank uplift. The observation of variable architecture suggests complex mechanisms and possibly a fundamental limitation in maximum sustainable rift flank elevation. The motivation for studying the TAM is to try to understand the geodynamics of this extreme elevation rift flank. Are the geodynamics of the area unique, or does the history of glaciation and related erosion contribute to the extreme uplift? With the existing data sets it is difficult to confidently constrain the geological architecture across representative sections of the TAM. Any effort to refine geodynamic mechanisms requires this basic understanding of the TAM architecture. The goal of this project is to (1) constrain the architecture of the rift system as well as the distribution and structure of sedimentary basins, glacial erosion and mafic igneous rocks surrounding the rift flank by acquiring three long wavelength geophysical transects with integrated gravity, magnetics, ice- penetrating radar, and ice surface measurements, (2) quantify the contribution of various geodynamic mechanisms to understand the geological conditions which can lead to extreme rift flank uplift, and (3) use the improved understanding of architecture and geophysical data to test geodynamic models in order to improve our understanding both of the TAM geodynamics and the general problem of the geodynamics of rift flank uplift worldwide. This project will allow development of a generalized framework for understanding the development of rift flank uplift as well as address the question of the specific geodynamic evolution of the TAM.", "east": -140.0, "geometry": "POINT(170 -82)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e MAGNETIC/MOTION SENSORS \u003e GRAVIMETERS \u003e GRAVIMETERS", "is_usap_dc": true, "keywords": "USAP-DC; Transantarctic Mountains; GRAVITY FIELD; TECTONICS", "locations": "Transantarctic Mountains", "north": -74.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": null, "persons": "Bell, Robin; Buck, W. Roger; Blankenship, Donald D.", "platforms": null, "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Contrasting Architecture and Dynamics of the Transantarctic Mountains", "uid": "p0010095", "west": 120.0}, {"awards": "9615282 Siddoway, Christine; 9615281 Luyendyk, Bruce", "bounds_geometry": "POLYGON((-170 -76,-166.5 -76,-163 -76,-159.5 -76,-156 -76,-152.5 -76,-149 -76,-145.5 -76,-142 -76,-138.5 -76,-135 -76,-135 -76.8,-135 -77.6,-135 -78.4,-135 -79.2,-135 -80,-135 -80.8,-135 -81.6,-135 -82.4,-135 -83.2,-135 -84,-138.5 -84,-142 -84,-145.5 -84,-149 -84,-152.5 -84,-156 -84,-159.5 -84,-163 -84,-166.5 -84,-170 -84,-170 -83.2,-170 -82.4,-170 -81.6,-170 -80.8,-170 -80,-170 -79.2,-170 -78.4,-170 -77.6,-170 -76.8,-170 -76))", "dataset_titles": "Bedrock sample data, Ford Ranges region (Marie Byrd Land); SOAR-WMB Airborne gravity data", "datasets": [{"dataset_uid": "601294", "doi": "10.15784/601294", "keywords": "Aerogeophysics; Airborne Gravity; Airplane; Antarctica; Free Air Gravity; Glaciers/ice Sheet; Glaciers/Ice Sheet; Gravimeter; Gravity; Gravity Data; Marie Byrd Land; Potential Field; Ross Sea; Solid Earth", "people": "Bell, Robin", "repository": "USAP-DC", "science_program": null, "title": "SOAR-WMB Airborne gravity data", "url": "https://www.usap-dc.org/view/dataset/601294"}, {"dataset_uid": "601829", "doi": "10.15784/601829", "keywords": "Antarctica; Cryosphere; Gondwana; Marie Byrd Land; Migmatite", "people": "Siddoway, Christine", "repository": "USAP-DC", "science_program": null, "title": "Bedrock sample data, Ford Ranges region (Marie Byrd Land)", "url": "https://www.usap-dc.org/view/dataset/601829"}], "date_created": "Fri, 24 Apr 2020 00:00:00 GMT", "description": "This award supports a collaborative project that combines air and ground geological-geophysical investigations to understand the tectonic and geological development of the boundary between the Ross Sea Rift and the Marie Byrd Land (MBL) volcanic province. The project will determine the Cenozoic tectonic history of the region and whether Neogene structures that localized outlet glacier flow developed within the context of Cenozoic rifting on the eastern Ross Embayment margin, or within the volcanic province in MBL. The geological structure at the boundary between the Ross Embayment and western MBL may be a result of: 1) Cenozoic extension on the eastern shoulder of the Ross Sea rift; 2) uplift and crustal extension related to Neogene mantle plume activity in western MBL; or a combination of the two. Faulting and volcanism, mountain uplift, and glacier downcutting appear to now be active in western MBL, where generally East-to-West-flowing outlet glaciers incise Paleozoic and Mesozoic bedrock, and deglaciated summits indicate a previous North-South glacial flow direction. This study requires data collection using SOAR (Support Office for Aerogeophysical Research, a facility supported by Office of Polar Programs which utilizes high precision differential GPS to support a laser altimeter, ice-penetrating radar, a towed proton magnetometer, and a Bell BGM-3 gravimeter). This survey requires data for 37,000 square kilometers using 5.3 kilometer line spacing with 15.6 kilometer tie lines, and 86,000 square kilometers using a grid of 10.6 by 10.6 kilometer spacing. Data will be acquired over several key features in the region including, among other, the eastern edge of the Ross Sea rift, over ice stream OEO, the transition from the Edward VII Peninsula plateau to the Ford Ranges, the continuation to the east of a gravity high known from previous reconnaissance mapping over the Fosdick Metamorphic Complex, an d the extent of the high-amplitude magnetic anomalies (volcanic centers?) detected southeast of the northern Ford Ranges by other investigators. SOAR products will include glaciology data useful for studying driving stresses, glacial flow and mass balance in the West Antarctic Ice Sheet (WAIS). The ground program is centered on the southern Ford Ranges. Geologic field mapping will focus on small scale brittle structures for regional kinematic interpretation, on glaciated surfaces and deposits, and on datable volcanic rocks for geochronologic control. The relative significance of fault and joint sets, the timing relationships between them, and the probable context of their formation will also be determined. Exposure ages will be determined for erosion surfaces and moraines. Interpretation of potential field data will be aided by on ground sampling for magnetic properties and density as well as ground based gravity measurements. Oriented samples will be taken for paleomagnetic studies. Combined airborne and ground investigations will obtain basic data for describing the geology and structure at the eastern boundary of the Ross Embayment both in outcrop and ice covered areas, and may be used to distinguish between Ross Sea rift- related structural activity from uplift and faulting on the perimeter of the MBL dome and volcanic province. Outcrop geology and structure will be extrapolated with the aerogeophysical data to infer the geology that resides beneath the WAIS. The new knowledge of Neogene tectonics in western MBL will contribute to a comprehensive model for the Cenozoic Ross rift and to understanding of the extent of plume activity in MBL. Both are important for determining the influence of Neogene tectonics on the ice streams and WAIS.", "east": -135.0, "geometry": "POINT(-152.5 -80)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e MAGNETIC/MOTION SENSORS \u003e GRAVIMETERS \u003e LGS", "is_usap_dc": true, "keywords": "GRAVITY; USAP-DC; Ross Sea; TECTONICS; Marie Byrd Land", "locations": "Ross Sea; Marie Byrd Land", "north": -76.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": null, "persons": "Luyendyk, Bruce P.; Siddoway, Christine", "platforms": null, "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -84.0, "title": "Air-Ground Study of Tectonics at the Boundary Between the Eastern Ross Embayment and Western Marie Byrd Land, Antarctica: Basement Geology and Structure", "uid": "p0010096", "west": -170.0}, {"awards": "1142129 Lamanna, Matthew", "bounds_geometry": "POLYGON((-60 -63.5,-59.6 -63.5,-59.2 -63.5,-58.8 -63.5,-58.4 -63.5,-58 -63.5,-57.6 -63.5,-57.2 -63.5,-56.8 -63.5,-56.4 -63.5,-56 -63.5,-56 -63.7,-56 -63.9,-56 -64.1,-56 -64.3,-56 -64.5,-56 -64.7,-56 -64.9,-56 -65.1,-56 -65.3,-56 -65.5,-56.4 -65.5,-56.8 -65.5,-57.2 -65.5,-57.6 -65.5,-58 -65.5,-58.4 -65.5,-58.8 -65.5,-59.2 -65.5,-59.6 -65.5,-60 -65.5,-60 -65.3,-60 -65.1,-60 -64.9,-60 -64.7,-60 -64.5,-60 -64.3,-60 -64.1,-60 -63.9,-60 -63.7,-60 -63.5))", "dataset_titles": "2008-2016 AMNH accessioned vertebrate fossils from Seymour Island; 3D digital reconstructions of vocal organs of Antarctic Cretaceous bird Vegavis and Paleogene bird Presbyornis", "datasets": [{"dataset_uid": "601035", "doi": "10.15784/601035", "keywords": "Antarctica; Biota; Birds", "people": "Lamanna, Matthew; Salisbury, Steven; Clarke, Julia", "repository": "USAP-DC", "science_program": null, "title": "3D digital reconstructions of vocal organs of Antarctic Cretaceous bird Vegavis and Paleogene bird Presbyornis", "url": "https://www.usap-dc.org/view/dataset/601035"}, {"dataset_uid": "601112", "doi": "10.15784/601112", "keywords": "Antarctica; Biota; Penguin; Seymour Island; Vertebrates", "people": "MacPhee, Ross", "repository": "USAP-DC", "science_program": null, "title": "2008-2016 AMNH accessioned vertebrate fossils from Seymour Island", "url": "https://www.usap-dc.org/view/dataset/601112"}], "date_created": "Wed, 12 Jul 2017 00:00:00 GMT", "description": "Intellectual Merit: \u003cbr/\u003eThe role that Antarctica has played in vertebrate evolution and paleobiogeography during the Late Cretaceous and early Paleogene is largely unknown. Evidence indicates that Antarctica was home to a diverse flora during the Late Cretaceous and Paleogene, yet the vertebrates that must have existed on the continent remain virtually unknown. To fill this gap, the PIs have formed the Antarctic Vertebrate Paleontology Initiative (AVPI), whose goal is to search for and collect Late Cretaceous-Paleogene vertebrate fossils in Antarctica at localities that have never been properly surveyed, as well as in areas of proven potential. Two field seasons are proposed for the James Ross Island Group on the northeastern margin of the Antarctic Peninsula. Expected finds include chondrichthyan and osteichthyan fishes, marine reptiles, ornithischian and non-avian theropod dinosaurs, ornithurine birds, and therian and non-therian mammals. Hypotheses to be tested include: 1) multiple extant bird and/or therian mammal lineages originated during the Cretaceous and survived the K-Pg boundary extinction event; 2) the \"Scotia Portal\" permitted the dispersal of continental vertebrates between Antarctica and South America prior to the latest Cretaceous and through to the late Paleocene or early Eocene; 3) Late Cretaceous non-avian dinosaurs from Antarctica are closely related to coeval taxa from other Gondwanan landmasses; 4) terminal Cretaceous marine reptile faunas from southern Gondwana differed from contemporaneous but more northerly assemblages; and 5) the collapse of Antarctic ichthyofaunal diversity during the K-Pg transition was triggered by a catastrophic extinction.\u003cbr/\u003e\u003cbr/\u003eBroader impacts: \u003cbr/\u003eThe PIs will communicate discoveries to audiences through a variety of channels, such as the Dinosaurs in Their Time exhibition at Carnegie Museum of Natural History and the outreach programs of the Environmental Science Institute of the University of Texas at Austin. In addition, Carnegie Museum will launch a student-oriented programming initiative using AVPI research as a primary focus. This array of activities will help some 2,000 Pittsburgh-area undergraduates to explore the relevance of deep-time discoveries to critical modern issues. The AVPI will provide research opportunities for eight undergraduate and three graduate students, several of whom will receive field training in Antarctica. Fossils will be accessioned into the Carnegie Museum collection, and made accessible virtually through the NSF-funded Digital Morphology library at University of Texas.", "east": -56.0, "geometry": "POINT(-58 -64.5)", "instruments": null, "is_usap_dc": true, "keywords": "USAP-DC; Not provided", "locations": null, "north": -63.5, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Lamanna, Matthew", "platforms": "Not provided", "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -65.5, "title": "Collaborative Research: Late Cretaceous-Paleogene Vertebrates from Antarctica: Implications for Paleobiogeography, Paleoenvironment, and Extinction in Polar Gondwana", "uid": "p0000380", "west": -60.0}, {"awards": "0947821 Ashworth, Allan", "bounds_geometry": "POLYGON((-180 -85.095235,-145.3719418 -85.095235,-110.7438836 -85.095235,-76.1158254 -85.095235,-41.4877672 -85.095235,-6.859709 -85.095235,27.7683492 -85.095235,62.3964074 -85.095235,97.0244656 -85.095235,131.6525238 -85.095235,166.280582 -85.095235,166.280582 -85.0996451,166.280582 -85.1040552,166.280582 -85.1084653,166.280582 -85.1128754,166.280582 -85.1172855,166.280582 -85.1216956,166.280582 -85.1261057,166.280582 -85.1305158,166.280582 -85.1349259,166.280582 -85.139336,131.6525238 -85.139336,97.0244656 -85.139336,62.3964074 -85.139336,27.7683492 -85.139336,-6.859709 -85.139336,-41.4877672 -85.139336,-76.1158254 -85.139336,-110.7438836 -85.139336,-145.3719418 -85.139336,180 -85.139336,178.6280582 -85.139336,177.2561164 -85.139336,175.8841746 -85.139336,174.5122328 -85.139336,173.140291 -85.139336,171.7683492 -85.139336,170.3964074 -85.139336,169.0244656 -85.139336,167.6525238 -85.139336,166.280582 -85.139336,166.280582 -85.1349259,166.280582 -85.1305158,166.280582 -85.1261057,166.280582 -85.1216956,166.280582 -85.1172855,166.280582 -85.1128754,166.280582 -85.1084653,166.280582 -85.1040552,166.280582 -85.0996451,166.280582 -85.095235,167.6525238 -85.095235,169.0244656 -85.095235,170.3964074 -85.095235,171.7683492 -85.095235,173.140291 -85.095235,174.5122328 -85.095235,175.8841746 -85.095235,177.2561164 -85.095235,178.6280582 -85.095235,-180 -85.095235))", "dataset_titles": "Neogene Paleoecology of the Beardmore Glacier Region", "datasets": [{"dataset_uid": "600387", "doi": "10.15784/600387", "keywords": "Antarctica; Beardmore Glacier; Biota; Fossil; GPS; Oliver Bluffs; Paleoclimate; Sample/collection Description; Sample/Collection Description; Seeds; Solid Earth; Transantarctic Mountains", "people": "Ashworth, Allan", "repository": "USAP-DC", "science_program": null, "title": "Neogene Paleoecology of the Beardmore Glacier Region", "url": "https://www.usap-dc.org/view/dataset/600387"}], "date_created": "Thu, 12 Jan 2017 00:00:00 GMT", "description": "Intellectual Merit: \u003cbr/\u003eThe primary goal of this project is to sample two beds in the Meyer Desert Formation, which are known to be especially fossiliferous containing plants, insects, other arthropods, freshwater mollusks, and fish. There is a possibility that the teeth and bones of a small marsupial could also be found. Previous studies have demonstrated that these horizons contain unique fossil assemblages that provide information used to reconstruct paleoenvironments and paleoclimate. The fossils represent organisms previously not found in Antarctica and consequently their study will lead to the development of new hypotheses concerning southern hemisphere biogeography. The new discoveries will also increase knowledge of paleoenvironments and paleoclimates as well as biogeographic relationships of the biota of the southern hemisphere. For some organisms, such as Nothofagus (Southern Beech) or the trechine groundbeetle, fossils would confirm that Antarctica was inhabited as part of Gondwana. For other fossils, such as the cyclorrhaphan fly or freshwater mollusks not expected to have inhabited Antarctica, the discoveries will require a reassessment of phylogenetic interpretations and a reinvestigation of the role of Antarctica in the evolutionary history of those organisms. The new fossil-based knowledge will require integration with interpretations from cladistics and molecular genetics to develop more comprehensive phylogenetic hypotheses for a range of organisms.\u003cbr/\u003e\u003cbr/\u003eBroader impacts: \u003cbr/\u003eThe discovery of fossils in Antarctica and implications for climate change has proven to be popular with the media. This attention will help disseminate the results of this study. Before the field season, the PI will work with local media and with area schools to set up field interviews and web casts from Antarctica. The project will also involve the training of a graduate student in the field and in the follow up studies of the fossils in the laboratory.", "east": 166.280582, "geometry": "POINT(0 -89.999)", "instruments": null, "is_usap_dc": true, "keywords": "Not provided", "locations": null, "north": -85.095235, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Ashworth, Allan", "platforms": "Not provided", "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.139336, "title": "Neogene Paleoecology of the Beardmore Glacier Region", "uid": "p0000424", "west": 166.280582}, {"awards": "1142052 MacPhee, Ross", "bounds_geometry": null, "dataset_titles": "Expedition data of NBP1602", "datasets": [{"dataset_uid": "002666", "doi": null, "keywords": null, "people": null, "repository": "R2R", "science_program": null, "title": "Expedition data of NBP1602", "url": "https://www.rvdata.us/search/cruise/NBP1602"}], "date_created": "Tue, 26 Apr 2016 00:00:00 GMT", "description": "The role that Antarctica has played in vertebrate evolution and paleobiogeography during the Late Cretaceous and early Paleogene is largely unknown. Evidence indicates that Antarctica was home to a diverse flora during the Late Cretaceous and Paleogene, yet the vertebrates that must have existed on the continent remain virtually unknown. To fill this gap, the PIs have formed the Antarctic Vertebrate Paleontology Initiative (AVPI), whose goal is to search for and collect Late Cretaceous-Paleogene vertebrate fossils in Antarctica at localities that have never been properly surveyed, as well as in areas of proven potential. Two field seasons are proposed for the James Ross Island Group on the northeastern margin of the Antarctic Peninsula. Expected finds include chondrichthyan and osteichthyan fishes, marine reptiles, ornithischian and non-avian theropod dinosaurs, ornithurine birds, and therian and non-therian mammals. Hypotheses to be tested include: 1) multiple extant bird and/or therian mammal lineages originated during the Cretaceous and survived the K-Pg boundary extinction event; 2) the ?Scotia Portal? permitted the dispersal of continental vertebrates between Antarctica and South America prior to the latest Cretaceous and through to the late Paleocene or early Eocene; 3) Late Cretaceous non-avian dinosaurs from Antarctica are closely related to coeval taxa from other Gondwanan landmasses; 4) terminal Cretaceous marine reptile faunas from southern Gondwana differed from contemporaneous but more northerly assemblages; and 5) the collapse of Antarctic ichthyofaunal diversity during the K-Pg transition was triggered by a catastrophic extinction.\u003cbr/\u003e\u003cbr/\u003eBroader impacts: \u003cbr/\u003eThe PIs will communicate discoveries to audiences through a variety of channels, such as the Dinosaurs in Their Time exhibition at Carnegie Museum of Natural History and the outreach programs of the Environmental Science Institute of the University of Texas at Austin. In addition, Carnegie Museum will launch a student-oriented programming initiative using AVPI research as a primary focus. This array of activities will help some 2,000 Pittsburgh-area undergraduates to explore the relevance of deep-time discoveries to critical modern issues. The AVPI will provide research opportunities for eight undergraduate and three graduate students, several of whom will receive field training in Antarctica. Fossils will be accessioned into the Carnegie Museum collection, and made accessible virtually through the NSF-funded Digital Morphology library at University of Texas.", "east": null, "geometry": null, "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e CHEMICAL METERS/ANALYZERS \u003e FLUOROMETERS; IN SITU/LABORATORY INSTRUMENTS \u003e MAGNETIC/MOTION SENSORS \u003e GRAVIMETERS \u003e GRAVIMETERS; IN SITU/LABORATORY INSTRUMENTS \u003e RECORDERS/LOGGERS \u003e AWS; EARTH REMOTE SENSING INSTRUMENTS \u003e PASSIVE REMOTE SENSING \u003e POSITIONING/NAVIGATION \u003e GPS \u003e GPS; EARTH REMOTE SENSING INSTRUMENTS \u003e ACTIVE REMOTE SENSING \u003e PROFILERS/SOUNDERS \u003e ACOUSTIC SOUNDERS \u003e ECHO SOUNDERS; IN SITU/LABORATORY INSTRUMENTS \u003e PROFILERS/SOUNDERS \u003e THERMOSALINOGRAPHS", "is_usap_dc": false, "keywords": "R/V NBP", "locations": null, "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Lamanna, Matthew", "platforms": "WATER-BASED PLATFORMS \u003e VESSELS \u003e SURFACE \u003e R/V NBP", "repo": "R2R", "repositories": "R2R", "science_programs": null, "south": null, "title": "Collaborative Research: Late Cretaceous-Paleogene Vertebrates from Antarctica: Implications for Paleobiogeography, Paleoenvironment, and Extinction in Polar Gondwana", "uid": "p0000854", "west": null}, {"awards": "0944645 Goodge, John", "bounds_geometry": null, "dataset_titles": null, "datasets": null, "date_created": "Wed, 11 Feb 2015 00:00:00 GMT", "description": "Intellectual Merit: \u003cbr/\u003eBecause of extensive ice cover and sparse remote-sensing data, the geology of the Precambrian East Antarctic Shield (EAS) remains largely unexplored with information limited to coastal outcrops from the African, Indian and Australian sectors. The East Antarctic lithosphere is globally important: as one of the largest coherent Precambrian shields, including rocks as old as ~3.8 Ga, it played an important role in global crustal growth; it is a key piece in assembly of the Rodinia and Gondwana supercontinents; it is the substrate to Earth?s major ice cap, including numerous sub-glacial lakes, and influences its thermal state and mechanical stability; and its geotectonic association with formerly adjacent continental blocks in South Africa, India and Australia suggest that it might harbor important mineral resources. This project will increase understanding of the age and composition of the western EAS lithosphere underlying and adjacent to the Transantarctic Mountains (TAM) using U-Pb ages, and Hf- and O-isotope analysis of zircon in early Paleozoic granitoids and Pleistocene glacial tills. TAM granites of the early Paleozoic Ross Orogen represent an areally extensive continental-margin arc suite that can provide direct information about the EAS crust from which it melted and/or through which it passed. Large rock clasts of igneous and metamorphic lithologies entrained in glacial tills at the head of major outlet glaciers traversing the TAM provide eroded samples of the proximal EAS basement. Zircons in these materials will provide data about age and inheritance (U-Pb), crustal vs. mantle origin (O isotopes), and crustal sources and evolution (Hf isotopes). Integrated along a significant part of the TAM, these data will help define broader crustal provinces that can be correlated with geophysical data and used to test models of crustal assembly. \u003cbr/\u003e\u003cbr/\u003eBroader impacts: \u003cbr/\u003eThis project will provide a research opportunity for undergraduate and graduate students. Undergraduates will be involved as Research Assistants in sample preparation, imaging, and analytical procedures, and conducting their own independent research. The two main elements of this project will form the basis of MS thesis projects for two graduate students at UMD. Through this project they will gain a good understanding of petrology, isotope geochemistry, and analytical methods. The broader scientific impacts of this work are that it will help develop a better understanding of the origin and evolution of East Antarctic lithosphere underlying and adjacent to the TAM, which will be of value to the broader earth science and glaciological community. Furthermore, knowledge of East Antarctic geology is of continuing interest to the general public because of strong curiosity about past supercontinents, what?s under the ice, and the impact of global warming on ice-sheet stability.", "east": null, "geometry": null, "instruments": null, "is_usap_dc": false, "keywords": "Transantarctic Mountains; Not provided", "locations": "Transantarctic Mountains", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Goodge, John", "platforms": "Not provided", "repositories": null, "science_programs": null, "south": null, "title": "Age and Composition of the East Antarctic Shield by Isotopic Analysis of Granite and Glacial Till", "uid": "p0000258", "west": null}, {"awards": "0944600 Siddoway, Christine; 0944615 Brown, Michael", "bounds_geometry": "POLYGON((-146.5 -76,-145.95 -76,-145.4 -76,-144.85 -76,-144.3 -76,-143.75 -76,-143.2 -76,-142.65 -76,-142.1 -76,-141.55 -76,-141 -76,-141 -76.15,-141 -76.3,-141 -76.45,-141 -76.6,-141 -76.75,-141 -76.9,-141 -77.05,-141 -77.2,-141 -77.35,-141 -77.5,-141.55 -77.5,-142.1 -77.5,-142.65 -77.5,-143.2 -77.5,-143.75 -77.5,-144.3 -77.5,-144.85 -77.5,-145.4 -77.5,-145.95 -77.5,-146.5 -77.5,-146.5 -77.35,-146.5 -77.2,-146.5 -77.05,-146.5 -76.9,-146.5 -76.75,-146.5 -76.6,-146.5 -76.45,-146.5 -76.3,-146.5 -76.15,-146.5 -76))", "dataset_titles": "Rock Samples collected from bedrock exposures, Ford Ranges, MBL", "datasets": [{"dataset_uid": "200415", "doi": "", "keywords": null, "people": null, "repository": "Polar Rock Repository", "science_program": null, "title": "Rock Samples collected from bedrock exposures, Ford Ranges, MBL", "url": "http://bprc.osu.edu/rr/"}], "date_created": "Thu, 09 Oct 2014 00:00:00 GMT", "description": "Intellectual Merit: \u003cbr/\u003eThe northern Ford ranges in Marie Byrd Land, Antarctica, record events and processes that transformed a voluminous succession of Lower Paleozoic turbidites intruded by calc-alkaline plutonic rocks into differentiated continental crust along the margin of Gondwana. In this study the Fosdick migmatite?granite complex will be used to investigate crustal evolution through an integrated program of fieldwork, structural geology, petrology, mineral equilibria modeling, geochronology and geochemistry. The PIs propose detailed traverses at four sites within the complex to investigate Paleozoic and Mesozoic orogenic cycles. They will use petrological associations, structural geometry, and microstructures of host gneisses and leucogranites to distinguish the migration and coalescence patterns for remnant melt flow networks, and carry out detailed sampling for geochronology, geochemistry and isotope research. Mafic plutonic phases will be sampled to acquire information about mantle contributions at the source. Mineral equilibria modeling of source rocks and granite products, combined with in situ mineral dating, will be employed to resolve the P?T?t trajectories arising from thickening/thinning of crust during orogenic cycles and to investigate melting and melt loss history. \u003cbr/\u003e\u003cbr/\u003eBroader impacts: \u003cbr/\u003eThis work involves research and educational initiatives for an early career female scientist, as well as Ph.D. and undergraduate students. Educational programs for high school audiences and undergraduate courses on interdisciplinary Antarctic science will be developed.", "east": -141.0, "geometry": "POINT(-143.75 -76.75)", "instruments": null, "is_usap_dc": true, "keywords": "Tectonic; TECTONICS; Transcurrent Faults; MAJOR ELEMENTS; Migmatite; Structural Geology; Gneiss Dome; Geochronology; AGE DETERMINATIONS; Detachment Faults; Marie Byrd Land", "locations": "Marie Byrd Land", "north": -76.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": null, "persons": "Siddoway, Christine; Brown, Mike", "platforms": null, "repo": "Polar Rock Repository", "repositories": "Polar Rock Repository", "science_programs": null, "south": -77.5, "title": "Collaborative research: Polyphase Orogenesis and Crustal Differentiation in West Antarctica", "uid": "p0000259", "west": -146.5}, {"awards": "0943934 Taylor, Edith; 0943935 Isbell, John", "bounds_geometry": null, "dataset_titles": "Portal to search geologic sample collections, Polar Rock Repository, Byrd Polar Research Center, The Ohio State University; Portal to search paleobotanical collections, Biodiversity Institute, University of Kansas", "datasets": [{"dataset_uid": "001402", "doi": "", "keywords": null, "people": null, "repository": "PI website", "science_program": null, "title": "Portal to search paleobotanical collections, Biodiversity Institute, University of Kansas", "url": "http://biodiversity.ku.edu/paleobotany/collections/collections-search"}, {"dataset_uid": "001377", "doi": "", "keywords": null, "people": null, "repository": "PRR", "science_program": null, "title": "Portal to search geologic sample collections, Polar Rock Repository, Byrd Polar Research Center, The Ohio State University", "url": "http://research.bpcrc.osu.edu/rr/"}, {"dataset_uid": "002567", "doi": "", "keywords": null, "people": null, "repository": "PI website", "science_program": null, "title": "Portal to search paleobotanical collections, Biodiversity Institute, University of Kansas", "url": "http://biodiversity.ku.edu/paleobotany/collections/collections-search"}], "date_created": "Tue, 23 Sep 2014 00:00:00 GMT", "description": "Intellectual Merit:\u003cbr/\u003eThe focus of this proposal is to collect fossil plants and palynomorphs from Permian-Triassic (P-T) rocks of the central Transantarctic Mountains (CTM), together with detailed data on sedimentologic and paleoecologic depositional environments. Fossil plants are important climate proxies that offer a unique window into the past, and the CTM fossils are an important source of data on the ways that plants responded to a strongly seasonal, polar light regime during a time of global change. The proposed project uses paleobotanical expertise, integrated with detailed sedimentology and stratigraphy, to reconstruct Permian-Triassic plant communities and their paleoenvironments. This interdisciplinary approach could uncover details of Antarctica?s complex late Paleozoic and Mesozoic environmental and climatic history which included: 1) deglaciation, 2) development and evolution of a post-glacial landscape and biota, 3) environmental and biotic change associated with the end-Permian mass extinction, 4) environmental recovery in the earliest Triassic, 5) strong, possible runaway Triassic greenhouse, and 6) widespread orogenesis and development of a foreland basin system. The PIs will collect compression floras both quantitatively and qualitatively to obtain biodiversity and abundance data. Since silicified wood is also present, the PIs will analyze tree rings and growth in a warm, high-latitude environment for which there is no modern analogue. Fossil plants from the CTM can provide biological and environmental information to: 1) interpret paleoclimate when Gondwana moved from icehouse to greenhouse conditions; 2) trace floral evolution across the P-T boundary; 3) reconstruct Antarctic plant life; 4) further understanding of plant adaptations to high latitudes. The Intellectual Merit of the research includes: 1) tracing floral evolution after the retreat of glaciers; 2) examining floral composition and diversity across the PTB; and 3) obtaining data on the recovery of these ecosystems in the Early Triassic, as well as changes in floral cover and diversity in the Early-Middle Triassic. Antarctica is the only place on Earth that includes extensive outcrops of terrestrial rocks, combined with widespread and well-preserved plant fossils, which spans this crucial time period.\u003cbr/\u003e\u003cbr/\u003eBroader impacts:\u003cbr/\u003eThe broader impacts include public outreach; teaching, and mentoring of women and underrepresented students; mentoring graduate student, postdoctoral, and new faculty women; development of an inquiry-based workshop on Antarctic paleoclimate with the Division of Education, KU Natural History Museum; continuing support of workshops for middle school girls in science via the Expanding Your Horizons Program, Emporia State University, and the TRIO program, KU; exploring Antarctic geosciences through video/computer links from McMurdo Station and satellite phone conferences from the field with K-12 science classes in Wisconsin and Kansas, and through participation in the NSF Research Experiences for Teachers program at the University of Wisconsin.", "east": null, "geometry": null, "instruments": null, "is_usap_dc": false, "keywords": "FIELD SURVEYS; LABORATORY; Transanatarctic Basin; Paleobotany; Fossil Plants; FIELD INVESTIGATION; Sedimentology; Late Paleozoic Ice Age; Not provided; Central Transantarctic Mountains; Beardmore Glacier", "locations": "Transanatarctic Basin; Central Transantarctic Mountains; Beardmore Glacier", "north": null, "nsf_funding_programs": "Antarctic Instrumentation and Support; Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": "PHANEROZOIC \u003e PALEOZOIC \u003e PERMIAN; PHANEROZOIC \u003e MESOZOIC \u003e TRIASSIC; PHANEROZOIC \u003e PALEOZOIC \u003e PERMIAN; PHANEROZOIC \u003e MESOZOIC \u003e TRIASSIC", "persons": "Isbell, John", "platforms": "LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD INVESTIGATION; LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD SURVEYS; Not provided; OTHER \u003e PHYSICAL MODELS \u003e LABORATORY", "repo": "PI website", "repositories": "PI website; PRR", "science_programs": null, "south": null, "title": "Collaborative Research: Antarctic Ecosystems across the Permian-Triassic Boundary: Integrating Paleobotany, Sedimentology, and Paleoecology", "uid": "p0000372", "west": null}, {"awards": "0944532 Isbell, John; 0944662 Elliot, David", "bounds_geometry": "POLYGON((158.9 -83,159.583 -83,160.266 -83,160.949 -83,161.632 -83,162.315 -83,162.998 -83,163.681 -83,164.364 -83,165.047 -83,165.73 -83,165.73 -83.21,165.73 -83.42,165.73 -83.63,165.73 -83.84,165.73 -84.05,165.73 -84.26,165.73 -84.47,165.73 -84.68,165.73 -84.89,165.73 -85.1,165.047 -85.1,164.364 -85.1,163.681 -85.1,162.998 -85.1,162.315 -85.1,161.632 -85.1,160.949 -85.1,160.266 -85.1,159.583 -85.1,158.9 -85.1,158.9 -84.89,158.9 -84.68,158.9 -84.47,158.9 -84.26,158.9 -84.05,158.9 -83.84,158.9 -83.63,158.9 -83.42,158.9 -83.21,158.9 -83))", "dataset_titles": "Rock Samples (full data link not provided)", "datasets": [{"dataset_uid": "000171", "doi": "", "keywords": null, "people": null, "repository": "PRR", "science_program": null, "title": "Rock Samples (full data link not provided)", "url": "http://bprc.osu.edu/rr/"}], "date_created": "Thu, 05 Dec 2013 00:00:00 GMT", "description": "Intellectual Merit: \u003cbr/\u003eThe goal of this project is to address relationships between foreland basins and their tectonic settings by combining detrital zircon isotope characteristics and sedimentological data. To accomplish this goal the PIs will develop a detailed geochronology and analyze Hf- and O-isotopes of detrital zircons in sandstones of the Devonian Taylor Group and the Permian-Triassic Victoria Group. These data will allow them to better determine provenance and basin fill, and to understand the nature of the now ice covered source regions in East and West Antarctica. The PIs will document possible unexposed/unknown crustal terrains in West Antarctica, investigate sub-glacial terrains of East Antarctica that were exposed to erosion during Devonian to Triassic time, and determine the evolving provenance and tectonic history of the Devonian to Triassic Gondwana basins in the central Transantarctic Mountains. Detrital zircon data will be interpreted in the context of fluvial dispersal/drainage patterns, sandstone petrology, and sequence stratigraphy. This interpretation will identify source terrains and evolving sediment provenances. Paleocurrent analysis and sequence stratigraphy will determine the timing and nature of changing tectonic conditions associated with development of the depositional basins and document the tectonic history of the Antarctic sector of Gondwana. Results from this study will answer questions about the Panthalassan margin of Gondwana, the Antarctic craton, and the Beacon depositional basin and their respective roles in global tectonics and the geologic and biotic history of Antarctica. The Beacon basin and adjacent uplands played an important role in the development and demise of Gondwanan glaciation through modification of polar climates, development of peat-forming mires, colonization of the landscape by plants, and were a migration route for Mesozoic vertebrates into Antarctica. \u003cbr/\u003e\u003cbr/\u003eBroader impacts: \u003cbr/\u003eThis proposal includes support for two graduate students who will participate in the fieldwork, and also support for other students to participate in laboratory studies. Results of the research will be incorporated in classroom teaching at the undergraduate and graduate levels and will help train the next generation of field geologists. Interactions with K-12 science classes will be achieved by video/computer conferencing and satellite phone connections from Antarctica. Another outreach effort is the developing cooperation between the Byrd Polar Research Center and the Center of Science and Industry in Columbus.", "east": 165.73, "geometry": "POINT(162.315 -84.05)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e SPECTROMETERS/RADIOMETERS \u003e ICP-MS; IN SITU/LABORATORY INSTRUMENTS \u003e SPECTROMETERS/RADIOMETERS \u003e XRF", "is_usap_dc": true, "keywords": "Not provided; LABORATORY", "locations": null, "north": -83.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": null, "persons": "Elliot, David; Isbell, John", "platforms": "Not provided; OTHER \u003e PHYSICAL MODELS \u003e LABORATORY", "repo": "PRR", "repositories": "PRR", "science_programs": null, "south": -85.1, "title": "Collaborative Research:Application of Detrital Zircon Isotope Characteristics and Sandstone Analysis of Beacon Strata to the Tectonic Evolution of the Antarctic Sector of Gondwana", "uid": "p0000312", "west": 158.9}, {"awards": "0839007 Near, Thomas", "bounds_geometry": "POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))", "dataset_titles": "Genetic Sequence Data", "datasets": [{"dataset_uid": "000151", "doi": "", "keywords": null, "people": null, "repository": "NCBI GenBank", "science_program": null, "title": "Genetic Sequence Data", "url": "http://www.ncbi.nlm.nih.gov/genbank/"}], "date_created": "Fri, 22 Nov 2013 00:00:00 GMT", "description": "This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).\u003cbr/\u003e\u003cbr/\u003eThe teleost fish fauna in the waters surrounding Antarctica are completely dominated by a single clade of closely related species, the Notothenioidei. This clade offers an unprecedented opportunity to investigate the effects of deep time paleogeographic transformations and periods of global climate change on lineage diversification and facilitation of adaptive radiation. With over 100 species, the Antarctic notothenioid radiation has been the subject of intensive investigation of biochemical, physiological, and morphological adaptations associated with freezing avoidance in the subzero Southern Ocean marine habitats. However, broadly sampled time-calibrated phylogenetic hypotheses of notothenioids have not been used to examine patterns of adaptive radiation in this clade. The goals of this project are to develop an intensive phylogenomic scale dataset for 90 of the 124 recognized notothenioid species, and use this genomic resource to generate time-calibrated molecular phylogenetic trees. The results of pilot phylogenetic studies indicate a very exciting correlation of the initial diversification of notothenioids with the fragmentation of East Gondwana approximately 80 million years ago, and the origin of the Antarctic Clade adaptive radiation at a time of global cooling and formation of polar conditions in the Southern Ocean, approximately 35 million years ago. This project will provide research experiences for undergraduates, training for a graduate student, and support a post doctoral researcher. In addition the project will include three high school students from New Haven Public Schools for summer research internships.", "east": 180.0, "geometry": "POINT(0 -89.999)", "instruments": null, "is_usap_dc": true, "keywords": "Not provided", "locations": null, "north": -60.0, "nsf_funding_programs": "Antarctic Organisms and Ecosystems", "paleo_time": null, "persons": "Near, Thomas", "platforms": "Not provided", "repo": "NCBI GenBank", "repositories": "NCBI GenBank", "science_programs": null, "south": -90.0, "title": "Genomic Approaches to Resolving Phylogenies of Antarctic Notothenioid Fishes", "uid": "p0000497", "west": -180.0}, {"awards": "0739726 Bowring, Samuel; 0739732 Fleming, Thomas", "bounds_geometry": "POLYGON((-180 -70,-174.3 -70,-168.6 -70,-162.9 -70,-157.2 -70,-151.5 -70,-145.8 -70,-140.1 -70,-134.4 -70,-128.7 -70,-123 -70,-123 -71.8,-123 -73.6,-123 -75.4,-123 -77.2,-123 -79,-123 -80.8,-123 -82.6,-123 -84.4,-123 -86.2,-123 -88,-128.7 -88,-134.4 -88,-140.1 -88,-145.8 -88,-151.5 -88,-157.2 -88,-162.9 -88,-168.6 -88,-174.3 -88,180 -88,176.5 -88,173 -88,169.5 -88,166 -88,162.5 -88,159 -88,155.5 -88,152 -88,148.5 -88,145 -88,145 -86.2,145 -84.4,145 -82.6,145 -80.8,145 -79,145 -77.2,145 -75.4,145 -73.6,145 -71.8,145 -70,148.5 -70,152 -70,155.5 -70,159 -70,162.5 -70,166 -70,169.5 -70,173 -70,176.5 -70,-180 -70))", "dataset_titles": null, "datasets": null, "date_created": "Thu, 24 May 2012 00:00:00 GMT", "description": "Abstract\u003cbr/\u003e\u003cbr/\u003e\u003cbr/\u003e\u003cbr/\u003eThis project uses high-precision, U-Pb dating of zircons from the Ferrar igneous intrusion of Antarctica to determine when it formed and whether it caused a major extinction event. Amongst the world?s largest intrusions, the Ferrar is also associated with breakup of Gondwana, the last supercontinent. Data from this project will show how the Ferrar and similar intrusions form and their potential to cause mass extinctions. Intrusion of the Ferrar has been tentatively linked to the Toarcian extinction event of 183 million years ago, thought to have been caused by methane released when the Ferrar intersected subterranean coal beds. The broader impacts are undergraduate, graduate and postdoctoral involvement in research, new collaborations between a research and primarily undergraduate institution, and K12 outreach.", "east": -123.0, "geometry": "POINT(-169 -79)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e SPECTROMETERS/RADIOMETERS \u003e IRMS; IN SITU/LABORATORY INSTRUMENTS \u003e SPECTROMETERS/RADIOMETERS \u003e MASS SPECTROMETERS; IN SITU/LABORATORY INSTRUMENTS \u003e SPECTROMETERS/RADIOMETERS \u003e XRF", "is_usap_dc": false, "keywords": "Ferrar Supergroup; LABORATORY", "locations": "Ferrar Supergroup", "north": -70.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": "PHANEROZOIC \u003e MESOZOIC \u003e JURASSIC", "persons": "Burgess, Seth; Fleming, Thomas", "platforms": "OTHER \u003e PHYSICAL MODELS \u003e LABORATORY", "repositories": null, "science_programs": null, "south": -88.0, "title": "Collaborative Research: High Precision U-Pb Geochronology of the Jurassic Ferrar Large Igneous Province, Antarctica", "uid": "p0000502", "west": 145.0}, {"awards": "0537609 Gee, Jeffrey", "bounds_geometry": "POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))", "dataset_titles": "An Integrated Geomagnetic and Petrologic Study of the Dufek Complex", "datasets": [{"dataset_uid": "600053", "doi": "10.15784/600053", "keywords": "Antarctica; Dufek Complex; Geology/Geophysics - Other; Paleomagnetism; Solid Earth", "people": "Gee, Jeffrey", "repository": "USAP-DC", "science_program": null, "title": "An Integrated Geomagnetic and Petrologic Study of the Dufek Complex", "url": "https://www.usap-dc.org/view/dataset/600053"}], "date_created": "Tue, 20 Dec 2011 00:00:00 GMT", "description": "This project studies remnant magnetization in igneous rocks from the Dufek igneous complex, Antarctica. Its primary goal is to understand variations in the Earth\u0027s magnetic field during the Mesozoic Dipole Low (MDL), a period when the Earth\u0027s magnetic field underwent dramatic weakening and rapid reversals. This work will resolve the MDL\u0027s timing and nature, and assess connections between reversal rate, geomagnetic intensity and directional variability, and large-scale geodynamic processes. The project also includes petrologic studies to determine cooling rate effects on magnetic signatures, and understand assembly of the Dufek as an igneous body. Poorly studied, the Dufek is amongst the world\u0027s largest intrusions and its formation is connected to the break-up of Gondwana. \u003cbr/\u003e\u003cbr/\u003eThe broader impacts of this project include graduate and undergraduate education and international collaboration with a German and Chilean IPY project.", "east": 180.0, "geometry": "POINT(0 -89.999)", "instruments": null, "is_usap_dc": true, "keywords": "FIELD SURVEYS", "locations": null, "north": -60.0, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Gee, Jeffrey", "platforms": "LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD SURVEYS", "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Collaborative Research: An Integrated Geomagnetic and Petrologic Study of the Dufek Complex", "uid": "p0000510", "west": -180.0}, {"awards": "0835480 Paulsen, Timothy", "bounds_geometry": "POLYGON((160 -84,161.5 -84,163 -84,164.5 -84,166 -84,167.5 -84,169 -84,170.5 -84,172 -84,173.5 -84,175 -84,175 -84.15,175 -84.3,175 -84.45,175 -84.6,175 -84.75,175 -84.9,175 -85.05,175 -85.2,175 -85.35,175 -85.5,173.5 -85.5,172 -85.5,170.5 -85.5,169 -85.5,167.5 -85.5,166 -85.5,164.5 -85.5,163 -85.5,161.5 -85.5,160 -85.5,160 -85.35,160 -85.2,160 -85.05,160 -84.9,160 -84.75,160 -84.6,160 -84.45,160 -84.3,160 -84.15,160 -84))", "dataset_titles": null, "datasets": null, "date_created": "Wed, 18 Aug 2010 00:00:00 GMT", "description": "This Small Grant for Exploratory Research investigates the origin of the Queen Maud Mountains, Antarctica, to understand the geodynamic processes that shaped Gondwana. Ages of various rock units will be determined using LA-MC-ICPMS analyses of zircons and 40Ar-39Ar analyses of hornblende. The project?s goal is to time deformation , sedimentary unit deposition, magmatism, and regional cooling. Results will be correlated with related rock units in Australia. By constraining the length and time scales of processes, the outcomes will offer insight into the geodynamic processes that caused deformation, such as slab roll-back or extension. In addition, dating these sedimentary units may offer insight into the Cambrian explosion of life, since the sediment flux caused by erosion of these mountains is conjectured to have seeded the ocean with the nutrients required for organisms to develop hard body parts. The broader impacts include support for undergraduate research.", "east": 175.0, "geometry": "POINT(167.5 -84.75)", "instruments": null, "is_usap_dc": false, "keywords": "Not provided", "locations": null, "north": -84.0, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Paulsen, Timothy", "platforms": "Not provided", "repositories": null, "science_programs": null, "south": -85.5, "title": "SGER:Exploratory Research on the Timing of Early Paleozoic Orogenesis along Gonwana\u0027s Paleo-Pacific Margin, Queen Maud Mountains, Antarctica", "uid": "p0000336", "west": 160.0}, {"awards": "9814041 Austin, Jr., James", "bounds_geometry": "POLYGON((-70.90616 -52.35281,-69.390587 -52.35281,-67.875014 -52.35281,-66.359441 -52.35281,-64.843868 -52.35281,-63.328295 -52.35281,-61.812722 -52.35281,-60.297149 -52.35281,-58.781576 -52.35281,-57.266003 -52.35281,-55.75043 -52.35281,-55.75043 -53.463301,-55.75043 -54.573792,-55.75043 -55.684283,-55.75043 -56.794774,-55.75043 -57.905265,-55.75043 -59.015756,-55.75043 -60.126247,-55.75043 -61.236738,-55.75043 -62.347229,-55.75043 -63.45772,-57.266003 -63.45772,-58.781576 -63.45772,-60.297149 -63.45772,-61.812722 -63.45772,-63.328295 -63.45772,-64.843868 -63.45772,-66.359441 -63.45772,-67.875014 -63.45772,-69.390587 -63.45772,-70.90616 -63.45772,-70.90616 -62.347229,-70.90616 -61.236738,-70.90616 -60.126247,-70.90616 -59.015756,-70.90616 -57.905265,-70.90616 -56.794774,-70.90616 -55.684283,-70.90616 -54.573792,-70.90616 -53.463301,-70.90616 -52.35281))", "dataset_titles": "Expedition Data", "datasets": [{"dataset_uid": "001987", "doi": "", "keywords": null, "people": null, "repository": "R2R", "science_program": null, "title": "Expedition Data", "url": "https://www.rvdata.us/search/cruise/NBP0002"}, {"dataset_uid": "001810", "doi": "", "keywords": null, "people": null, "repository": "R2R", "science_program": null, "title": "Expedition Data", "url": "https://www.rvdata.us/search/cruise/NBP0007A"}], "date_created": "Tue, 04 May 2010 00:00:00 GMT", "description": "This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports research to study the deep crustal structure of the Bransfield Strait region. Bransfield Strait, in the northern Antarctic Peninsula, is one of a small number of modern basins that may be critical for understanding ancient mountain-building processes. The Strait is an actively-extending marginal basin in the far southeast Pacific, between the Antarctic Peninsula and the South Shetland Islands, an inactive volcanic arc. Widespread crustal extension, accompanied by volcanism along the Strait\u0027s axis, may be associated with slow underthrusting of oceanic crust at the South Shetland Trench; similar \"back-arc\" extension occurred along the entire Pacific margin (now western South America/West Antarctica) of the supercontinent known as Gondwanaland during the Jurassic-Early Cretaceous. Mid-Cretaceous deformation of these basins some 100 million years ago initiated uplift of the Andes. By understanding the deep structure and evolution of Bransfield rift, it should be possible to evaluate the crustal precursor to the Andes, and thereby understand more fully the early evolution of this globally important mountain chain.\u003cbr/\u003e\u003cbr/\u003eYears of international earth sciences research in Bransfield Strait has produced consensus on important aspects of its geologic environment: (1) It is probably a young (probably ~4 million years old) rift in preexisting Antarctic Peninsula crust; continued stretching of this crust results in complex fault patterns and associated volcanism. The volcanism, high heat flow, and mapped crustal trends are all consistent with the basin\u0027s continuing evolution as a rift; (2) The volcanism, which is recent and continuing, occurs along a \"neovolcanic\" zone centralized along the basin\u0027s axis. Multichannel seismic data collected aboard R/V Maurice Ewing in 1991 illustrate the following basin-wide characteristics of Bransfield Strait - a) widespread extension and faulting, b) the rise of crustal diapirs or domes associated with flower-shaped normal-fault structures, and c) a complicated system of fault-bounded segments across strike. The geophysical evidence also suggests NE-to-SW propagation of the rift, with initial crustal inflation/doming followed by deflation/subsidence, volcanism, and extension along normal faults.\u003cbr/\u003e\u003cbr/\u003eAlthough Bransfield Strait exhibits geophysical and geologic evidence for extension and volcanism, continental crust fragmentation does not appear to have gone to completion in this \"back-arc\" basin and ocean crust is not yet being generated. Instead, Bransfield rift lies near the critical transition from intracontinental rifting to seafloor-spreading. The basin\u0027s asymmetry, and seismic evidence for shallow intracrustal detachment faulting, suggest that it may be near one end-member of the spectrum of models proposed for continental break-up. Therefore, this basin is a \"natural lab\" for studying diverse processes involved in forming continental margins.\u003cbr/\u003e\u003cbr/\u003eUnderstanding Bransfield rift\u0027s deep crustal structure is the key to resolving its stage of evolution, and should also provide a starting point for models of Andean mountain-building. This work will define the deep structure by collecting and analyzing high-quality, high-density ocean bottom seismometer (OBS) profiles both along and across the Strait\u0027s strike. Scientific objectives are as follows: (1) to develop a detailed seismic velocity model for this rift; (2) to calibrate velocity structure and crustal thickness changes associated with presumed NE-to-SW rift propagation, as deduced from the multichannel seismic interpretations; (3) to document the degree to which deep velocity structure corresponds to along- and across-strike crustal segmentation; and (4) to assess structural relationships between the South Shetland Islands \"arc\" and Bransfield rift.\u003cbr/\u003e\u003cbr/\u003eThe proposed OBS data, integrated with interpretations of both Ewing profiles and those from other high-quality geophysical coverage in Bransfield Strait, will complement ongoing deep seismic analysis of Antarctic Peninsula crust to the southwest and additional OBS monitoring for deep earthquakes, in order to understand the complex plate tectonic evolution of this region.", "east": -55.75043, "geometry": "POINT(-63.328295 -57.905265)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e MAGNETIC/MOTION SENSORS \u003e GRAVIMETERS \u003e GRAVIMETERS; IN SITU/LABORATORY INSTRUMENTS \u003e PROFILERS/SOUNDERS \u003e ACOUSTIC SOUNDERS \u003e MSBS", "is_usap_dc": false, "keywords": "R/V NBP", "locations": null, "north": -52.35281, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Austin, James; Austin, James Jr.", "platforms": "WATER-BASED PLATFORMS \u003e VESSELS \u003e SURFACE \u003e R/V NBP", "repo": "R2R", "repositories": "R2R", "science_programs": null, "south": -63.45772, "title": "The Young Marginal Basin as a Key to Understanding the Rift-Drift Transition and Andean Orogenesis: OBS Refraction Profiling for Crustal Structure in Bransfield Strait", "uid": "p0000615", "west": -70.90616}, {"awards": "0817163 Reiners, Peter; 0816934 Thomson, Stuart", "bounds_geometry": "POLYGON((72 -66,72.3 -66,72.6 -66,72.9 -66,73.2 -66,73.5 -66,73.8 -66,74.1 -66,74.4 -66,74.7 -66,75 -66,75 -66.3,75 -66.6,75 -66.9,75 -67.2,75 -67.5,75 -67.8,75 -68.1,75 -68.4,75 -68.7,75 -69,74.7 -69,74.4 -69,74.1 -69,73.8 -69,73.5 -69,73.2 -69,72.9 -69,72.6 -69,72.3 -69,72 -69,72 -68.7,72 -68.4,72 -68.1,72 -67.8,72 -67.5,72 -67.2,72 -66.9,72 -66.6,72 -66.3,72 -66))", "dataset_titles": "Triple-dating (Pb-FT-He) of Antarctic Detritus and the Origin of the Gamburtsev Mountains", "datasets": [{"dataset_uid": "600089", "doi": "10.15784/600089", "keywords": "Antarctica; Fission Track Thermochronology; Gamburtsev Mountains; Geochronology; Solid Earth", "people": "Thomson, Stuart", "repository": "USAP-DC", "science_program": null, "title": "Triple-dating (Pb-FT-He) of Antarctic Detritus and the Origin of the Gamburtsev Mountains", "url": "https://www.usap-dc.org/view/dataset/600089"}, {"dataset_uid": "600090", "doi": "10.15784/600090", "keywords": "Antarctica; Gamburtsev Mountains; Geochronology; Marine Sediments; NBP0101; ODP1166; Prydz Bay; Solid Earth; Southern Ocean", "people": "Gehrels, George; Reiners, Peter", "repository": "USAP-DC", "science_program": null, "title": "Triple-dating (Pb-FT-He) of Antarctic Detritus and the Origin of the Gamburtsev Mountains", "url": "https://www.usap-dc.org/view/dataset/600090"}], "date_created": "Thu, 30 Apr 2009 00:00:00 GMT", "description": "This Small Grant for Exploratory Research investigates the origin and evolution of the Gamburtsev subglacial mountains (GSM). These mountains are considered the nucleation point for Antarctica\u0027s largest ice sheets; however, being of indeterminate age, they may postdate ice sheet formation. As well, their formation could reflect tectonic events during the breakup of Gondwana. The project studies GSM-derived detrital zircon and apatite crystals from Prydz Bay obtained by the Ocean Drilling Program. Analytical work includes triple-dating thermochronometry by U/Pb, fission track, and (U/Th)/He methods. The combined technique offers insight into both high and low temperature processes, and is potentially sensitive to both the orogenic events and the subsequent cooling and exhumation due to erosion. In terms of broader impacts, this project supports research for a postdoctoral fellow and an", "east": 75.0, "geometry": "POINT(73.5 -67.5)", "instruments": null, "is_usap_dc": true, "keywords": "Not provided", "locations": null, "north": -66.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": null, "persons": "Thompson, Stuart; Reiners, Peter; Gehrels, George", "platforms": "Not provided", "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -69.0, "title": "Collaborative Research: SGER: Triple-dating (Pb-FT-He) of Antarctic Detritus and the Origin of the Gamburtsev Mountains", "uid": "p0000210", "west": 72.0}, {"awards": "0338279 Siddoway, Christine", "bounds_geometry": "POLYGON((-157 -75,-155.3 -75,-153.6 -75,-151.9 -75,-150.2 -75,-148.5 -75,-146.8 -75,-145.1 -75,-143.4 -75,-141.7 -75,-140 -75,-140 -75.3,-140 -75.6,-140 -75.9,-140 -76.2,-140 -76.5,-140 -76.8,-140 -77.1,-140 -77.4,-140 -77.7,-140 -78,-141.7 -78,-143.4 -78,-145.1 -78,-146.8 -78,-148.5 -78,-150.2 -78,-151.9 -78,-153.6 -78,-155.3 -78,-157 -78,-157 -77.7,-157 -77.4,-157 -77.1,-157 -76.8,-157 -76.5,-157 -76.2,-157 -75.9,-157 -75.6,-157 -75.3,-157 -75))", "dataset_titles": "Bedrock sample data, Ford Ranges region (Marie Byrd Land)", "datasets": [{"dataset_uid": "601829", "doi": "10.15784/601829", "keywords": "Antarctica; Cryosphere; Gondwana; Marie Byrd Land; Migmatite", "people": "Siddoway, Christine", "repository": "USAP-DC", "science_program": null, "title": "Bedrock sample data, Ford Ranges region (Marie Byrd Land)", "url": "https://www.usap-dc.org/view/dataset/601829"}], "date_created": "Wed, 09 Jul 2008 00:00:00 GMT", "description": "This project will study migmatite domes found in the Fosdick Mountains of the Ford Ranges, western Marie Byrd Land, Antarctica. This area offers unique, three-dimensional exposures that may offer new insight into dome formation, which is a fundamental process of mountain building. These domes are derived from sedimentary and plutonic protoliths that are complexly interfolded at decimeter to kilometer scales. Preliminary findings from geobarometry and U-Pb monazite dating of anatexite suggest that peak metamorphism was underway at 105 Ma at crustal depths of ~25 km, followed by decompression as the Fosdick dome was emplaced to 16-17 km, or possibly as low as 8.5 km, in the crust by 99 Ma. Near-isothermal conditions were maintained during ascent, favorable for producing substantial volumes of melt through biotite-dehydration melting. This dome has been interpreted as a product of extensional exhumation. This is a viable interpretation from the regional standpoint, because the dome was emplaced in mid-Cretaceous time during the rapid onset of divergent tectonics along the proto- Pacific margin of Gondwana. However, the complex internal structures of the Fosdick Mountains have yet to be considered and may be more consistent with alternative intepretations such as upward extrusion within a contractional setting or lateral flow within a transcurrent attachment zone. This proposal is for detailed structural analysis, paired with geothermobarometry and geochronology, to determine the flow behavior and structural style that produced the internal architecture of the Fosdick dome. The results will improve our general understanding of the role of gneiss domes in transferring material and heat during mountain-building, and will characterize the behavior of the middle crust during a time of rapid transition from divergent to convergent tectonics along the active margin of Gondwana. In terms of broader impacts, this work will train undergraduate and graduate students, and involve them as collaborators in the development of curricular materials. It will also foster mentoring relationships between graduate and undergraduate students.", "east": -140.0, "geometry": "POINT(-148.5 -76.5)", "instruments": null, "is_usap_dc": false, "keywords": "Transcurrent Faults; Geochronology; Tectonic; Detachment Faults; Structural Geology; Not provided; Gneiss Dome; Migmatite", "locations": null, "north": -75.0, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Siddoway, Christine; Teyssier, Christian", "platforms": "Not provided", "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "Gneiss Dome architecture: Investigation of Form and Process in the Fosdick Mountains, W. Antarctica", "uid": "p0000744", "west": -157.0}, {"awards": "0603729 Mukasa, Samuel", "bounds_geometry": "POLYGON((161.2 -77.5029,161.26 -77.5029,161.32 -77.5029,161.38 -77.5029,161.44 -77.5029,161.5 -77.5029,161.56 -77.5029,161.62 -77.5029,161.68 -77.5029,161.74 -77.5029,161.8 -77.5029,161.8 -77.52511,161.8 -77.54732,161.8 -77.56953,161.8 -77.59174,161.8 -77.61395,161.8 -77.63616,161.8 -77.65837,161.8 -77.68058,161.8 -77.70279,161.8 -77.725,161.74 -77.725,161.68 -77.725,161.62 -77.725,161.56 -77.725,161.5 -77.725,161.44 -77.725,161.38 -77.725,161.32 -77.725,161.26 -77.725,161.2 -77.725,161.2 -77.70279,161.2 -77.68058,161.2 -77.65837,161.2 -77.63616,161.2 -77.61395,161.2 -77.59174,161.2 -77.56953,161.2 -77.54732,161.2 -77.52511,161.2 -77.5029))", "dataset_titles": null, "datasets": null, "date_created": "Thu, 02 Aug 2007 00:00:00 GMT", "description": "This Small Grant for Exploratory Research supports measurement of PGE abundances and Hf, Nd, Sr and Pb isotopic ratios of the Basement Sill and Dais Intrusion lobe of the Ferrar Magmatic Province, Antarctica. This province played a key role in the breakup of Gondwanaland. Models to be tested are magma production by plume activity versus decompression melting in a fossil subduction zone. The PGE data will also be used to evaluate the behavior of volatiles during magma crystallization, which other evidence indicates may have reached saturation. The samples to be studied were collected during the NSF-sponsored, Magmatic Field Laboratory Workshop held in Antarctica in 2005. This study\u0027s results will be compliled with complementary data from other attendees to develop a new multidisciplinary model of Ferrar magmatism.\u003cbr/\u003e\u003cbr/\u003eThe broader impacts fo this work include international collaboration and informal science education through public outreach to K12 students.", "east": 161.8, "geometry": "POINT(161.5 -77.61395)", "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e SPECTROMETERS/RADIOMETERS \u003e ICP-MS", "is_usap_dc": false, "keywords": "Magma Crystallization; Ferrar Magmatic Province; Dais Intrusion Lobe; Basement Sill; Antarctic; HELICOPTER; Ferrar Magmatism; Antarctica", "locations": "Basement Sill; Ferrar Magmatic Province; Antarctica; Antarctic", "north": -77.5029, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Mukasa, Samuel", "platforms": "AIR-BASED PLATFORMS \u003e ROTORCRAFT/HELICOPTER \u003e HELICOPTER", "repositories": null, "science_programs": null, "south": -77.725, "title": "SGER: Basement Sill, Antarctica: Constraints from its PGE Abundance Patterns and Isotopic Compositions on Magma Source Characteristics and Crystallization Processes", "uid": "p0000278", "west": 161.2}, {"awards": "9615398 Encarnacion, John", "bounds_geometry": null, "dataset_titles": null, "datasets": null, "date_created": "Wed, 11 Jul 2007 00:00:00 GMT", "description": "Encarnaci_n OPP 9615398 Abstract Basement rocks of the Transantarctic Mountains are believed to record a change in the paleo-Pacific margin of Gondwana from a rifted passive margin to a tectonically active margin (Ross orogen). Recent hypothesis suggest that the passive margin phase resulted from Neoproterozoic rifting of Laurentia from Antarctica (\"SWEAT\" hypothesis). The succeeding active margin phase (Ross orogeny) was one of several tectonic events (\"Pan African\" events) that resulted from plate convergence/transpression that was probably a consequence of the assembly of components of the Gondwana supercontinent. Although these basement units provide one of the keys for understanding the break up and assembly of these major continental masses, few precise ages are available to address the following important issues: (1) Is there any pre-rift high-grade cratonal basement exposed along the Transantarctic Mountains, and what is/are its precise age? Is this age compatible with a Laurentia connection? (2) What is the age of potential rift/passive margin sediments (Beardmore Group) along the Queen Maud Mountains sector of the orogen? (3) What is the relative and absolute timing of magmatism and contractional deformation of supracrustal units in the orogen? Was deformation diachronous and thus possibly related to transpressional tectonics, or did it occur in a discrete pulse that is more compatible with a collision? How does contraction of the orogen fit in with emplacement of voluminous plutonic and volcanic rocks? The answers to these questions are central to understanding the kinematic evolution of this major orogenic belt and its role in Neoproterozoic-Early Paleozoic continental reconstructions and plate kinematics. Hence, this award supports funding for precise U-Pb dating, using zircon, monazite, baddeleyite, and/or titanite from a variety of magmatic rocks in the Queen Ma ud Mountains, which can address the foregoing problems. In addition to the issues above, precise dating of volcanics that are interbedded with carbonates containing probable Middle Cambrian fauna could potentially provide a calibration point for the Middle Cambrian, which will fill a gap in the absolute time scale for the early Paleozoic.", "east": null, "geometry": null, "instruments": null, "is_usap_dc": false, "keywords": "Not provided", "locations": null, "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Encarnacion, John", "platforms": "Not provided", "repositories": null, "science_programs": null, "south": null, "title": "Constraints on the Tectonomagmatic Evolution of the Pacific Margin of Gondwana from U-Pb Geochronology of Magmatic Rocks in the Transantarctic Basement", "uid": "p0000277", "west": null}, {"awards": "0126146 Miller, Molly", "bounds_geometry": "POINT(171 -83.75)", "dataset_titles": null, "datasets": null, "date_created": "Wed, 20 Jun 2007 00:00:00 GMT", "description": "This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, provides funds for a study to investigate paleoenvironmental conditions during the late Paleozoic and Mesozoic in central interior Antarctica. The 4 km thick sequence of sedimentary rocks, known as the Beacon Supergroup, in the Beardmore Glacier area records 90 million years of Permian through Jurassic history of this high-paleolatitude sector of Gondwana. It accumulated in a foreland basin with a rate of subsidence approximately equal to the rate of deposition. The deposits have yielded diverse vertebrate fossils, in situ fossil forests, and exceptionally well preserved plant fossils. They give a unique glimpse of glacial, lake, and stream/river environments and ecosystems and preserve an unparalleled record of the depositional, paleoclimatic, and tectonic history of the area. The excellent work done to date provides a solid base of information on which to build understanding of conditions and processes.\u003cbr/\u003e\u003cbr/\u003eThis project is a collaborative study of this stratigraphic section that will integrate sedimentologic, paleontologic, and ichnologic observations to answer focused questions, including: (1) What are the stratigraphic architecture and alluvial facies of Upper Permian to Jurassic rocks in the Beardmore area?; (2) In what tectonostratigraphic setting were these rocks deposited?; (3) Did vertebrates inhabit the cold, near-polar, Permian floodplains, as indicated by vertebrate burrows, and can these burrows be used to identify, for the first time, the presence of small early mammals in Mesozoic deposits?; and (4) How did bottom-dwelling animals in lakes and streams use substrate ecospace, how did ecospace use at these high paleolatitudes differ from ecospace use in equivalent environments at low paleolatitudes, and what does burrow distribution reveal about seasonality of river flow and thus about paleoclimate? Answers to these questions will (1) clarify the paleoclimatic, basinal, and tectonic history of this part of Gondwana, (2) elucidate the colonization of near-polar ecosystems by vertebrates, (3) provide new information on the environmental and paleolatitudinal distributions of early mammals, and (4) allow semi-quantitative assessment of the activity and abundance of bottom-dwelling animals in different freshwater environments at high and low latitudes. In summary, this project will contribute significantly to an understanding of paleobiology and paleoecology at a high latitude floodplain setting during a time in Earth history when the climate was much different than today.", "east": 171.0, "geometry": "POINT(171 -83.75)", "instruments": null, "is_usap_dc": false, "keywords": "Beardmore Glacier; FIELD SURVEYS; Paleoclimate; Permian; Paleontology; FIELD INVESTIGATION; Sedimentologic; Ichnologic; Stratigraphic; Gondwana", "locations": "Beardmore Glacier", "north": -83.75, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": "PHANEROZOIC \u003e MESOZOIC \u003e JURASSIC; PHANEROZOIC \u003e PALEOZOIC \u003e PERMIAN; PHANEROZOIC \u003e MESOZOIC \u003e TRIASSIC", "persons": "Miller, Molly", "platforms": "LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD INVESTIGATION; LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD SURVEYS", "repositories": null, "science_programs": null, "south": -83.75, "title": "Collaborative Research: Late Paleozoic-Mesozoic Fauna, Environment, Climate and Basinal History: Beardmore Glacier Area, Transantarctic Mountains", "uid": "p0000736", "west": 171.0}, {"awards": "0003844 Case, Judd", "bounds_geometry": null, "dataset_titles": "Expedition Data; Expedition data of LMG0309", "datasets": [{"dataset_uid": "001683", "doi": "", "keywords": null, "people": null, "repository": "R2R", "science_program": null, "title": "Expedition Data", "url": "https://www.rvdata.us/search/cruise/LMG0309"}, {"dataset_uid": "002676", "doi": null, "keywords": null, "people": null, "repository": "R2R", "science_program": null, "title": "Expedition data of LMG0309", "url": "https://www.rvdata.us/search/cruise/LMG0309"}], "date_created": "Wed, 28 Mar 2007 00:00:00 GMT", "description": "This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a collaborative research project between the Saint Mary\u0027s College of California, the South Dakota School of Mines and technology, and the Argentine Antarctic Institute (Instituto Antartico Argentino or IAA) to investigate the Late Mesozoic vertebrate paleontology of the James Ross Basin in the Antarctic Peninsula region. The Campanian through the Maastrichtian ages (80 to 65 million years ago) is an important time interval concerning vertebrate biogeography (i.e. dispersals and separations due to moving landmasses) and evolution between Antarctica and other Southern Hemisphere continents (including India, i.e. Gondwana). Moreover, the dispersal of terrestrial vertebrates (i.e. dinosaurs and marsupial mammals) from North America to Antarctica and beyond (e.g. Australia) via Patagonia and the Antarctic Peninsula, as well as the dispersal of modern birds from Antarctica northward are important unresolved questions in paleontology. These dispersal events include vertebrates not only in the terrestrial realms, but also in marine settings. Both widely distributed and localized marine reptile species have been identified in Antarctica, creating questions concerning their dispersal in conjunction with the terrestrial animals.\u003cbr/\u003e\u003cbr/\u003eThe Antarctic Peninsula and Patagonia represent the western-most portion of the Weddellian Paleobiogeographic Province, a region that extends from Patagonia through the Antarctic Peninsula and western Antarctica to Australia and New Zealand. Within this province lie the dispersal routes for interchanges of vertebrates between South America and: 1) Madagascar and India, and 2) Australia. As the result of previous work by the principal investigators, it is postulated that an isthmus between more northern South America and the Antarctic craton has served to bring typical North American dinosaurs, such as hadrosaurs (duck-billed dinosaurs) and presumably marsupials traveling overland, while marine reptiles swam along coastal waters, to Antarctica in the latest Cretaceous. Finally, this region has served as the cradle for the evolution, if not the origin, for groups of modern birds, and evolution of a suite of typical southern hemisphere plants.\u003cbr/\u003e\u003cbr/\u003eIn order to confirm and expand upon these hypotheses, investigations into the latest Cretaceous deposits of the James Ross Basin, Antarctica Peninsula must be continued. The Cape Lamb and Sandwich Bluff geological units, of the Lopez de Bertodano Formation in the James Ross Basin along the eastern Antarctic Peninsula, exhibit a mixture of marine and terrestrial deposits. The following vertebrates have been recovered from these sedimentary deposits during previous field seasons: plesiosaur and mosasaur marine reptiles; plant eating dinosaurs; a meat eating dinosaur; and a variety of modern bird groups, including shorebirds, wading birds and lagoonal birds.\u003cbr/\u003e\u003cbr/\u003eThis project will undertake new fieldwork to recover new specimens in order to test biogeographic and evolutionary hypotheses concerning Late Cretaceous vertebrates in Gondwana. Fieldwork is planned in January 2002 and 2003 to explore the eastern slopes of Cape Lamb, Sandwich Bluff and False Island Point on Vega Island, and the Santa Marta Cove area of James Ross Island.\u003cbr/\u003e\u003cbr/\u003eThis research will result in important new insights about the evolution and geographic dispersal of several vertebrate species. The results are important to understanding the development and evolution of life on Earth.\u003cbr/\u003e\u003cbr/\u003eThis is a collaborative research project with Argentinean scientists from the IAA and it continues a productive collaboration that began in 1995. In addition, collaboration with vertebrate paleontologists from the Museo de La Plata, both in the field and at our respective institutions in Argentina and in the United States, will continue.", "east": null, "geometry": null, "instruments": "IN SITU/LABORATORY INSTRUMENTS \u003e PROFILERS/SOUNDERS \u003e CTD; IN SITU/LABORATORY INSTRUMENTS \u003e PRESSURE/HEIGHT METERS \u003e PRESSURE SENSORS; EARTH REMOTE SENSING INSTRUMENTS \u003e PASSIVE REMOTE SENSING \u003e POSITIONING/NAVIGATION \u003e GPS \u003e GPS; IN SITU/LABORATORY INSTRUMENTS \u003e PROFILERS/SOUNDERS \u003e ACOUSTIC SOUNDERS \u003e ADCP", "is_usap_dc": false, "keywords": "Not provided; R/V LMG", "locations": null, "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": "PHANEROZOIC \u003e MESOZOIC \u003e CRETACEOUS", "persons": "Case, Judd; Blake, Daniel", "platforms": "Not provided; WATER-BASED PLATFORMS \u003e VESSELS \u003e SURFACE \u003e R/V LMG", "repo": "R2R", "repositories": "R2R", "science_programs": null, "south": null, "title": "Collaborative Research: Evolution and Biogeography of Late Cretaceous Vertebrates from the James Ross Basin, Antarctic Peninsula", "uid": "p0000129", "west": null}, {"awards": "0232042 Finn, Carol", "bounds_geometry": "POLYGON((139.27539 -82.35733,142.369695 -82.35733,145.464 -82.35733,148.558305 -82.35733,151.65261 -82.35733,154.746915 -82.35733,157.84122 -82.35733,160.935525 -82.35733,164.02983 -82.35733,167.124135 -82.35733,170.21844 -82.35733,170.21844 -82.516831,170.21844 -82.676332,170.21844 -82.835833,170.21844 -82.995334,170.21844 -83.154835,170.21844 -83.314336,170.21844 -83.473837,170.21844 -83.633338,170.21844 -83.792839,170.21844 -83.95234,167.124135 -83.95234,164.02983 -83.95234,160.935525 -83.95234,157.84122 -83.95234,154.746915 -83.95234,151.65261 -83.95234,148.558305 -83.95234,145.464 -83.95234,142.369695 -83.95234,139.27539 -83.95234,139.27539 -83.792839,139.27539 -83.633338,139.27539 -83.473837,139.27539 -83.314336,139.27539 -83.154835,139.27539 -82.995334,139.27539 -82.835833,139.27539 -82.676332,139.27539 -82.516831,139.27539 -82.35733))", "dataset_titles": null, "datasets": null, "date_created": "Tue, 16 Aug 2005 00:00:00 GMT", "description": "This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a project to investigate the Transantarctic Mountains and an adjacent region of East Antarctica. The East Antarctic shield is one of Earth\u0027s oldest and largest cratonic assemblies, with a long-lived Archean to early Paleozoic history. Long-standing interest in the geologic evolution of this shield has been rekindled over the past decade by tectonic models linking East Antarctica with other Precambrian crustal elements in the Rodinia and Gondwanaland supercontinents. It is postulated that the Pacific margin of East Antarctica was rifted from Laurentia during late Neoproterozoic breakup of Rodinia, and it then developed as an active plate boundary during subsequent amalgamation of Gondwanaland in the earliest Paleozoic. If true, the East Antarctic shield played a key role in supercontinent transformation at a time of global changes in plate configuration, terrestrial surficial process, sea level, and marine geochemistry and biota. A better understanding of the geological evolution of the East Antarctic shield is therefore critical for studying Precambrian crustal evolution in general, as well as resource distribution, biosphere evolution, and glacial and climate history during later periods of Earth history. Because of nearly complete coverage by the polar ice cap, however, Antarctica remains the single most geologically unexplored continent. Exposures of cratonic basement are largely limited to coastal outcrops in George V Land and Terre Adelie (Australian sector), the Prince Charles Mountains and Enderby Land (Indian sector), and Queen Maud Land (African sector), where the geology is reasonably well-known. By contrast, little is known about the composition and structure of the shield interior. Given the extensive ice cover, collection of airborne geophysical data is the most cost-effective method to characterize broad areas of sub-ice basement and expand our knowledge of the East Antarctic shield interior. \u003cbr/\u003e\u003cbr/\u003eThis project will conduct an airborne magnetic survey (coupled with ground-based gravity measurements) across an important window into the shield where it is exposed in the Nimrod Glacier area of the central Transantarctic Mountains. Specific goals are to:\u003cbr/\u003e1. Characterize the magnetic and gravity signature of East Antarctic crustal basement exposed at the Ross margin (Nimrod Group),\u003cbr/\u003e2. Extend the magnetic data westward along a corridor across the polar ice cap in order to image the crust in ice-covered areas,\u003cbr/\u003e3. Obtain magnetic data over the Ross Orogen in order to image the ice-covered boundary between basement and supracrustal rocks, allowing us to better constrain the geometry of fundamental Ross structures, and\u003cbr/\u003e4. Use the shape, trends, wavelengths, and amplitudes of magnetic anomalies to define magnetic domains in the shield, common building blocks for continent-scale studies of Precambrian geologic structure and evolution.\u003cbr/\u003e\u003cbr/\u003eHigh-resolution airborne magnetic data will be collected along a transect extending from exposed rocks of the Nimrod Group across the adjacent polar ice cap. The Nimrod Group represents the only bona fide Archean-Proterozoic shield basement exposed for over 2500 km of the Pacific margin of Antarctica. This survey will characterize the geologically well-known shield terrain in this sector using geophysical methods for the first time. This baseline over the exposed shield will allow for better interpretation of geophysical patterns in other ice-covered regions and can be used to target future investigations. In collaboration with colleagues from the BGR (Germany), a tightly-spaced, \"draped\" helicopter magnetic survey will be flown during the 2003-04 austral summer, to be complemented by ground measurements of gravity over the exposed basement. Data reduction, interpretation and geological correlation will be completed in the second year. This project will enhance the education of students, the advancement of under-represented groups, the research instrumentation of the U.S. Antarctic Program, partnerships between the federal government and institutions of higher education, and cooperation between national research programs. It will benefit society through the creation of new basic knowledge about the Antarctic continent, which in turn may help with applied research in other fields such as the glacial history of Antarctica.", "east": 170.21844, "geometry": "POINT(154.746915 -83.154835)", "instruments": "SOLAR/SPACE OBSERVING INSTRUMENTS \u003e MAGNETIC FIELD/ELECTRIC FIELD INSTRUMENTS \u003e MAM", "is_usap_dc": false, "keywords": "Central Transantarctic Mountains; Aeromagnetic Data; HELICOPTER; DHC-6; Not provided", "locations": "Central Transantarctic Mountains", "north": -82.35733, "nsf_funding_programs": null, "paleo_time": null, "persons": "Finn, C. A.; FINN, CAROL", "platforms": "AIR-BASED PLATFORMS \u003e PROPELLER \u003e DHC-6; AIR-BASED PLATFORMS \u003e ROTORCRAFT/HELICOPTER \u003e HELICOPTER; Not provided", "repositories": null, "science_programs": null, "south": -83.95234, "title": "Collaborative Research: Geophysical Mapping of the East Antarctic Shield Adjacent to the Transantarctic Mountains", "uid": "p0000249", "west": 139.27539}]

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