[{"awards": "1744927 Mitrovica, Jerry; 1745015 Zimmerer, Matthew; 1744949 Campbell, Seth", "bounds_geometry": "POLYGON((-145 -74,-141.6 -74,-138.2 -74,-134.8 -74,-131.4 -74,-128 -74,-124.6 -74,-121.2 -74,-117.8 -74,-114.4 -74,-111 -74,-111 -74.6,-111 -75.2,-111 -75.8,-111 -76.4,-111 -77,-111 -77.6,-111 -78.2,-111 -78.8,-111 -79.4,-111 -80,-114.4 -80,-117.8 -80,-121.2 -80,-124.6 -80,-128 -80,-131.4 -80,-134.8 -80,-138.2 -80,-141.6 -80,-145 -80,-145 -79.4,-145 -78.8,-145 -78.2,-145 -77.6,-145 -77,-145 -76.4,-145 -75.8,-145 -75.2,-145 -74.6,-145 -74))", "dataset_titles": null, "datasets": null, "date_created": "Sun, 07 Aug 2022 00:00:00 GMT", "description": "This work will constrain WAIS elevation during the last interglacial in Marie Byrd Land (MBL) using shallow drilling to obtain bedrock samples from the ice-rock interface and measuring cosmogenic nuclide concentrations. The 26Al/10Be ratio is not sensitive to recent short periods of exposure or cover and thus quartz-bearing bedrock cannot be used to resolve exposure during MIS 5. In contrast, the bedrock on the southern flank of Mt. Waesche consists of young lava flows with existing 40Ar/39Ar ages \u003c 350 ka; at least\r\none flow with suitable lithology extends beneath the ice. Tephra chronology and bands of proximal volcanic debris in the adjacent blue ice area indicates volcanic eruptions within 107 ka at Mt. Waesche. The ice-covered lava flows near the ice margin are not likely to be significantly older. Thus, any 3He and36Cl in sub-ice bedrock requires exposure during the late Pleistocene. Although ice sheet models predict ice elevations 40 m lower during the LGM, exposure at deeper depths would be attributable to down draw during MIS 5. Two field seasons are proposed. The first would involve a GPR survey of the subglacial topography \u003c100m under the blue ice area where we propose to drill, and mapping and dating the adjacent exposed lava flows in order to trace lava flows of known age and composition below the ice margin and locate appropriate drilling sites. 40Ar/39Ar and exposure ages of the subaerial lava flows would be measured during the following year. The second season would focus on drilling 8 boreholes (two transects) with the Winkie drill from near the ice margin to 80 m depth to obtain rock cores from the subice lava flows. 40Ar/39Ar ages of rock cores will determine the timing of eruption, whereas comparison with exposure ages of the same cores will constrain the timing and minimum extent of past down draw of the WAIS in MBL. In addition, deeper GPR surveys and subglacial rock lithologies might also reveal evidence of lava/ice interactions and independently place constraints on lower ice levels during past\r\neruptions. Finally, investigators will compare results with modeled ice elevation histories and estimate the isostatic crustal response in order to convert our observed relative elevations to actual past ice elevations.", "east": -111.0, "geometry": "POINT(-128 -77)", "instruments": null, "is_usap_dc": true, "keywords": "Mt. Waesche; SNOW/ICE; FIELD SURVEYS; LAVA COMPOSITION/TEXTURE", "locations": "Mt. Waesche", "north": -74.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences; Antarctic Earth Sciences", "paleo_time": null, "persons": "Zimmerer, Matthew; Campbell, Seth; Mitrovica, Jerry", "platforms": "LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD SURVEYS", "repositories": null, "science_programs": null, "south": -80.0, "title": "Collaborative Research: Constraining West Antarctic Ice Sheet elevation during the last interglacial", "uid": "p0010367", "west": -145.0}, {"awards": "1443576 Panter, Kurt", "bounds_geometry": "POLYGON((-154.1 -86.9,-154.03 -86.9,-153.96 -86.9,-153.89 -86.9,-153.82 -86.9,-153.75 -86.9,-153.68 -86.9,-153.61 -86.9,-153.54 -86.9,-153.47 -86.9,-153.4 -86.9,-153.4 -86.92,-153.4 -86.94,-153.4 -86.96,-153.4 -86.98,-153.4 -87,-153.4 -87.02,-153.4 -87.04,-153.4 -87.06,-153.4 -87.08,-153.4 -87.1,-153.47 -87.1,-153.54 -87.1,-153.61 -87.1,-153.68 -87.1,-153.75 -87.1,-153.82 -87.1,-153.89 -87.1,-153.96 -87.1,-154.03 -87.1,-154.1 -87.1,-154.1 -87.08,-154.1 -87.06,-154.1 -87.04,-154.1 -87.02,-154.1 -87,-154.1 -86.98,-154.1 -86.96,-154.1 -86.94,-154.1 -86.92,-154.1 -86.9))", "dataset_titles": "Volcanological and Petrological measurements on Mt. Early and Sheridan Bluff volcanoes, upper Scott Glacier, Antarctica ", "datasets": [{"dataset_uid": "601331", "doi": "10.15784/601331", "keywords": "Antarctica; Chemistry:Rock; Geochronology; Glacial Volcanism; Magma Differentiation; Major Elements; Mantle Melting; Solid Earth; Trace Elements; Transantarctic Mountains", "people": "Panter, Kurt", "repository": "USAP-DC", "science_program": null, "title": "Volcanological and Petrological measurements on Mt. Early and Sheridan Bluff volcanoes, upper Scott Glacier, Antarctica ", "url": "https://www.usap-dc.org/view/dataset/601331"}], "date_created": "Fri, 05 Jun 2020 00:00:00 GMT", "description": "Predictions of future sea level rise require better understanding of the changing dynamics of the Greenland and Antarctic ice sheets. One way to better understand the past history of the ice sheets is to obtain records from inland ice for past geological periods, particularly in Antarctica, the world\u0027s largest remaining ice sheet. Such records are exceedingly rare, and can be acquired at volcanic outcrops in the La Gorce Mountains of the central Transantarctic Mountains. Volcanoes now exposed within the La Gorce Mountains erupted beneath the East Antarctic ice sheet and the data collected will record how thick the ice sheet was in the past. In addition, information will be used to determine the thermal conditions at the base of the ice sheet, which impacts ice sheet stability. The project will also investigate the origin of volcanic activity in Antarctica and links to the West Antarctic Rift System (WARS). The WARS is a broad area of extended (i.e. stretched) continental crust, similar to that found in East Africa, and volcanism is wide spread and long-lived (65 million years to currently active) and despite more than 50 years of research, the fundamental cause of volcanism and rifting in Antarctica is still vigorously debated. The results of this award therefore also potentially impact the study of oceanic volcanism in the entire southwestern Pacific region (e.g., New Zealand and Australia), where volcanic fields of similar composition and age have been linked by common magma sources and processes. The field program includes a graduate student who will work on the collection, analysis, and interpretation of petrological data as part of his/her Masters project. The experience and specialized analytical training being offered will improve the quality of the student\u0027s research and optimize their opportunities for their future. The proposed work fosters faculty and student national and international collaboration, including working with multi-user facilities that provide advanced technological mentoring of science students. Results will be broadly disseminated in peer-reviewed journals, public presentations at science meetings, and in outreach activities. Petrologic and geochemical data will be disseminated to be the community through the Polar Rock Repository. The study of subglacially erupted volcanic rocks has been developed to the extent that it is now the most powerful proxy methodology for establishing precise \u0027snapshots\u0027 of ice sheets, including multiple critical ice parameters. Such data should include measurements of ice thickness, surface elevation and stability, which will be used to verify, or reject, published semi-empirical models relating ice dynamics to sea level changes. In addition to establishing whether East Antarctic ice was present during the formation of the volcanoes, data will be used to derive the coeval ice thicknesses, surface elevations and basal thermal regime(s) in concert with a precise new geochronology using the 40Ar/39Ar dating method. Inferences from measurement of standard geochemical characteristics (major, trace elements and Sr, Nd, Pb, O isotopes) will be used to investigate a possible relationship between the volcanoes and the recently discovered subglacial ridge under the East Antarctic ice, which may be a rift flank uplift. The ridge has never been sampled, is undated and its significance is uncertain. The data will provide important new information about the deep Earth and geodynamic processes beneath this mostly ice covered and poorly understood sector of the Antarctic continent.", "east": -153.4, "geometry": "POINT(-153.75 -87)", "instruments": null, "is_usap_dc": true, "keywords": "GEOCHEMISTRY; Major Elements; Magma Differntiation; ISOTOPES; FIELD INVESTIGATION; Trace Elements; Transantarctic Mountains; LABORATORY; LAVA COMPOSITION/TEXTURE; Mantle Melting; USAP-DC; Geochronology; LAND RECORDS; Glacial Volcanism", "locations": "Transantarctic Mountains", "north": -86.9, "nsf_funding_programs": "Antarctic Earth Sciences", "paleo_time": null, "persons": "Panter, Kurt", "platforms": "LAND-BASED PLATFORMS \u003e FIELD SITES \u003e FIELD INVESTIGATION; OTHER \u003e PHYSICAL MODELS \u003e LABORATORY", "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -87.1, "title": "Investigating Early Miocene Sub-ice Volcanoes in Antarctica for Improved Modeling and understanding of a Large Magmatic Province", "uid": "p0010105", "west": -154.1}]

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Collaborative Research: Constraining West Antarctic Ice Sheet elevation during the last interglacial

1744927
1745015
1744949

2022-08-07

Zimmerer, Matthew; Campbell, Seth; Mitrovica, Jerry

No dataset link provided

This work will constrain WAIS elevation during the last interglacial in Marie Byrd Land (MBL) using shallow drilling to obtain bedrock samples from the ice-rock interface and measuring cosmogenic nuclide concentrations. The 26Al/10Be ratio is not sensitive to recent short periods of exposure or cover and thus quartz-bearing bedrock cannot be used to resolve exposure during MIS 5. In contrast, the bedrock on the southern flank of Mt. Waesche consists of young lava flows with existing 40Ar/39Ar ages < 350 ka; at least one flow with suitable lithology extends beneath the ice. Tephra chronology and bands of proximal volcanic debris in the adjacent blue ice area indicates volcanic eruptions within 107 ka at Mt. Waesche. The ice-covered lava flows near the ice margin are not likely to be significantly older. Thus, any 3He and36Cl in sub-ice bedrock requires exposure during the late Pleistocene. Although ice sheet models predict ice elevations 40 m lower during the LGM, exposure at deeper depths would be attributable to down draw during MIS 5. Two field seasons are proposed. The first would involve a GPR survey of the subglacial topography <100m under the blue ice area where we propose to drill, and mapping and dating the adjacent exposed lava flows in order to trace lava flows of known age and composition below the ice margin and locate appropriate drilling sites. 40Ar/39Ar and exposure ages of the subaerial lava flows would be measured during the following year. The second season would focus on drilling 8 boreholes (two transects) with the Winkie drill from near the ice margin to 80 m depth to obtain rock cores from the subice lava flows. 40Ar/39Ar ages of rock cores will determine the timing of eruption, whereas comparison with exposure ages of the same cores will constrain the timing and minimum extent of past down draw of the WAIS in MBL. In addition, deeper GPR surveys and subglacial rock lithologies might also reveal evidence of lava/ice interactions and independently place constraints on lower ice levels during past eruptions. Finally, investigators will compare results with modeled ice elevation histories and estimate the isostatic crustal response in order to convert our observed relative elevations to actual past ice elevations.

Investigating Early Miocene Sub-ice Volcanoes in Antarctica for Improved Modeling and understanding of a Large Magmatic Province

1443576

2020-06-05

Panter, Kurt

Volcanological and Petrological measurements on Mt. Early and Sheridan Bluff volcanoes, upper Scott Glacier, Antarctica

USAP-DC

Predictions of future sea level rise require better understanding of the changing dynamics of the Greenland and Antarctic ice sheets. One way to better understand the past history of the ice sheets is to obtain records from inland ice for past geological periods, particularly in Antarctica, the world's largest remaining ice sheet. Such records are exceedingly rare, and can be acquired at volcanic outcrops in the La Gorce Mountains of the central Transantarctic Mountains. Volcanoes now exposed within the La Gorce Mountains erupted beneath the East Antarctic ice sheet and the data collected will record how thick the ice sheet was in the past. In addition, information will be used to determine the thermal conditions at the base of the ice sheet, which impacts ice sheet stability. The project will also investigate the origin of volcanic activity in Antarctica and links to the West Antarctic Rift System (WARS). The WARS is a broad area of extended (i.e. stretched) continental crust, similar to that found in East Africa, and volcanism is wide spread and long-lived (65 million years to currently active) and despite more than 50 years of research, the fundamental cause of volcanism and rifting in Antarctica is still vigorously debated. The results of this award therefore also potentially impact the study of oceanic volcanism in the entire southwestern Pacific region (e.g., New Zealand and Australia), where volcanic fields of similar composition and age have been linked by common magma sources and processes. The field program includes a graduate student who will work on the collection, analysis, and interpretation of petrological data as part of his/her Masters project. The experience and specialized analytical training being offered will improve the quality of the student's research and optimize their opportunities for their future. The proposed work fosters faculty and student national and international collaboration, including working with multi-user facilities that provide advanced technological mentoring of science students. Results will be broadly disseminated in peer-reviewed journals, public presentations at science meetings, and in outreach activities. Petrologic and geochemical data will be disseminated to be the community through the Polar Rock Repository. The study of subglacially erupted volcanic rocks has been developed to the extent that it is now the most powerful proxy methodology for establishing precise 'snapshots' of ice sheets, including multiple critical ice parameters. Such data should include measurements of ice thickness, surface elevation and stability, which will be used to verify, or reject, published semi-empirical models relating ice dynamics to sea level changes. In addition to establishing whether East Antarctic ice was present during the formation of the volcanoes, data will be used to derive the coeval ice thicknesses, surface elevations and basal thermal regime(s) in concert with a precise new geochronology using the 40Ar/39Ar dating method. Inferences from measurement of standard geochemical characteristics (major, trace elements and Sr, Nd, Pb, O isotopes) will be used to investigate a possible relationship between the volcanoes and the recently discovered subglacial ridge under the East Antarctic ice, which may be a rift flank uplift. The ridge has never been sampled, is undated and its significance is uncertain. The data will provide important new information about the deep Earth and geodynamic processes beneath this mostly ice covered and poorly understood sector of the Antarctic continent.