{"dp_type": "Dataset", "free_text": "Elephant Moraine"}
[{"awards": "2423761 Blackburn, Terrence; 2042495 Blackburn, Terrence", "bounds_geometry": ["POLYGON((-180 -75,-144 -75,-108 -75,-72 -75,-36 -75,0 -75,36 -75,72 -75,108 -75,144 -75,180 -75,180 -76.5,180 -78,180 -79.5,180 -81,180 -82.5,180 -84,180 -85.5,180 -87,180 -88.5,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -88.5,-180 -87,-180 -85.5,-180 -84,-180 -82.5,-180 -81,-180 -79.5,-180 -78,-180 -76.5,-180 -75))"], "date_created": "Mon, 17 Mar 2025 00:00:00 GMT", "description": "This dataset includes geochemical analyses of carbonate nodules collected at Elephant Moraine and the Pensacola Mountains, East Antarctica. Oxygen and uranium-series isotope analyses indicate that these carbonates precipitated from glacial meltwater during deglacial periods in the late Pleistocene. Carbonate \u03b413C values as low as -32.75 \u2030 identify thermogenic methane as a primary carbon source, while clumped isotope measurements indicate formation temperatures of 12 - 20\u02daC, consistent with a geothermal origin. Lipid biomarker analyses further show that organic matter preserved in the nodules is highly thermally matured. These findings indicate that deep-sourced thermogenic methane migrated as hydrocarbon seeps to shallow pore spaces within basal sediments, demonstrating that geothermally active areas can be hotspots for methane accumulation below the Antarctic Ice Sheet. This material is based on services provided by the Polar Rock Repository with support from the National Science Foundation, under Cooperative Agreement OPP-2137467.", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; Carbon Isotopes; Cryosphere; East Antarctica; Elephant Moraine; Geochronology; Isotope Data; Subglacial", "locations": "Antarctica; Elephant Moraine; East Antarctica", "north": -75.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences", "persons": "Piccione, Gavin", "project_titles": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates; EAGER: Pedogenic Carbonates Record Insolation Driven Surface Melting in Antarctica", "projects": [{"proj_uid": "p0010459", "repository": "USAP-DC", "title": "EAGER: Pedogenic Carbonates Record Insolation Driven Surface Melting in Antarctica"}, {"proj_uid": "p0010192", "repository": "USAP-DC", "title": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Thermogenic Methane Production in Antarctic Subglacial Hydrocarbon Seeps", "uid": "601918", "west": -180.0}, {"awards": "2042495 Blackburn, Terrence", "bounds_geometry": null, "date_created": "Wed, 10 Aug 2022 00:00:00 GMT", "description": "This file includes U-series isotopic and 234U/230Th chronologic data from two chemical precipitates deposited beneath the Antarctic Ice Sheet. Precipitate mineral compositions consist of opal and calcite layers. Sample MA113 was found at Mount Achernar moraine (84.2\u00b0S, 161\u00b0E), and sample PRR50489 was found at Elephant Moraine (76.3\u00b0S, 157.3\u00b0E).", "east": null, "geometry": null, "keywords": "Antarctica; East Antarctica", "locations": "Antarctica; East Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Piccione, Gavin; Blackburn, Terrence", "project_titles": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates", "projects": [{"proj_uid": "p0010192", "repository": "USAP-DC", "title": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Subglacial Precipitates Record Antarctic Ice Sheet Response to Pleistocene Millennial Climate Cycles", "uid": "601594", "west": null}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
Thermogenic Methane Production in Antarctic Subglacial Hydrocarbon Seeps
|
2423761 2042495 |
2025-03-17 | Piccione, Gavin |
EAGER: Pedogenic Carbonates Record Insolation Driven Surface Melting in Antarctica Collaborative Research: Reconstructing East Antarctica’s Past Response to Climate using Subglacial Precipitates |
This dataset includes geochemical analyses of carbonate nodules collected at Elephant Moraine and the Pensacola Mountains, East Antarctica. Oxygen and uranium-series isotope analyses indicate that these carbonates precipitated from glacial meltwater during deglacial periods in the late Pleistocene. Carbonate δ13C values as low as -32.75 ‰ identify thermogenic methane as a primary carbon source, while clumped isotope measurements indicate formation temperatures of 12 - 20˚C, consistent with a geothermal origin. Lipid biomarker analyses further show that organic matter preserved in the nodules is highly thermally matured. These findings indicate that deep-sourced thermogenic methane migrated as hydrocarbon seeps to shallow pore spaces within basal sediments, demonstrating that geothermally active areas can be hotspots for methane accumulation below the Antarctic Ice Sheet. This material is based on services provided by the Polar Rock Repository with support from the National Science Foundation, under Cooperative Agreement OPP-2137467. | ["POLYGON((-180 -75,-144 -75,-108 -75,-72 -75,-36 -75,0 -75,36 -75,72 -75,108 -75,144 -75,180 -75,180 -76.5,180 -78,180 -79.5,180 -81,180 -82.5,180 -84,180 -85.5,180 -87,180 -88.5,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -88.5,-180 -87,-180 -85.5,-180 -84,-180 -82.5,-180 -81,-180 -79.5,-180 -78,-180 -76.5,-180 -75))"] | ["POINT(0 -89.999)"] | false | false |
|
Subglacial Precipitates Record Antarctic Ice Sheet Response to Pleistocene Millennial Climate Cycles
|
2042495 |
2022-08-10 | Piccione, Gavin; Blackburn, Terrence |
Collaborative Research: Reconstructing East Antarctica’s Past Response to Climate using Subglacial Precipitates |
This file includes U-series isotopic and 234U/230Th chronologic data from two chemical precipitates deposited beneath the Antarctic Ice Sheet. Precipitate mineral compositions consist of opal and calcite layers. Sample MA113 was found at Mount Achernar moraine (84.2°S, 161°E), and sample PRR50489 was found at Elephant Moraine (76.3°S, 157.3°E). | [] | [] | false | false |
