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{"@context": "https://schema.org/", "@type": "Dataset", "@id": "doi:10.15784/601918", "additionalType": ["geolink:Dataset", "vivo:Dataset"], "name": "Thermogenic Methane Production in Antarctic Subglacial Hydrocarbon Seeps", "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.", "citation": "Piccione, G. (2024) \"Thermogenic Methane Production in Antarctic Subglacial Hydrocarbon Seeps\" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601918.", "datePublished": "2024-04-30", "keywords": ["Antarctica", "Carbon Isotopes", "Cryosphere", "East Antarctica", "Elephant Moraine", "Geochronology", "Isotope Data", "Subglacial"], "creator": [{"@type": "Person", "additionalType": "geolink:Person", "name": "Piccione, Gavin", "email": "terryb@ucsc.edu", "affiliation": {"@type": "Organization", "name": null}}], "distribution": [{"@type": "DataDownload", "additionalType": "http://www.w3.org/ns/dcat#DataCatalog", "encodingFormat": "text/xml", "name": "ISO Metadata Document", "url": "https://www.usap-dc.org/metadata/isoxml/601918iso.xml", "contentUrl": "/dataset/filename"}, {"@type": "DataDownload", "@id": "http://dx.doi.org/10.15784/601918", "additionalType": "dcat:distribution", "url": "http://dx.doi.org/10.15784/601918", "contentUrl": "/dataset/filename", "encodingFormat": "text/html"}, {"@type": "DataDownload", "@id": "https://www.usap-dc.org/view/dataset/601918", "additionalType": "dcat:distribution", "url": "https://www.usap-dc.org/view/dataset/601918", "contentUrl": "/dataset/filename", "encodingFormat": "text/html"}], "identifier": {"@type": "PropertyValue", "propertyID": "https://registry.identifiers.org/registry/doi", "value": "doi:10.15784/601918", "url": "https://doi.org/10.15784/601918"}, "contributor": [{"@type": "Role", "roleName": "credit", "description": "funderName:NSF:GEO:OPP:Antarctic Earth Sciences awardNumber:2042495 awardTitle:Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates"}, {"@type": "Role", "roleName": "credit", "description": "funderName:NSF:GEO:OPP:Antarctic Earth Sciences awardNumber:2423761 awardTitle:EAGER: Pedogenic Carbonates Record Insolation Driven Surface Melting in Antarctica"}], "license": [{"@type": "CreativeWork", "URL": "https://creativecommons.org/publicdomain/zero/1.0/", "name": "MD_Constraints", "description": "useLimitation: Creative Commons Zero v1.0 Universal [CC0 1.0]."}, {"@type": "CreativeWork", "name": "MD_LegalConstraints", "description": "accessConstraints: license. otherConstraints: Creative Commons Zero v1.0 Universal [CC0 1.0]."}, {"@type": "CreativeWork", "name": "MD_SecurityConstraints", "description": "classification: "}], "publisher": {"@type": "Organization", "name": "U.S. Antarctic Program (USAP) Data Center"}, "spatialCoverage": [{"@type": "Place", "geo": {"@type": "GeoShape", "box": "-90, -180, -75, 180"}}]}

Thermogenic Methane Production in Antarctic Subglacial Hydrocarbon Seeps Data DOI: https://doi.org/10.15784/601918 Cite as Piccione, G. (2024) "Thermogenic Methane Production in Antarctic Subglacial Hydrocarbon Seeps" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601918. Abstract 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. Creator(s): Piccione, Gavin Date Created: 2025-03-17 Repository: USAP-DC (current) License: Creative Commons Zero v1.0 Universal [CC0 1.0] Spatial Extent(s) West: -180, East: 180, South: -90, North: -75 Temporal Extent(s) Start: 2021-06-01 - End: 2025-03-14 Award(s) NSF 2042495 NSF 2423761 Version: 2 Related Project(s) Collaborative Research: Reconstructing East Antarctica’s Past Response to Climate using Subglacial Precipitates EAGER: Pedogenic Carbonates Record Insolation Driven Surface Melting in Antarctica Keywords Antarctica Carbon Isotopes Cryosphere East Antarctica Elephant Moraine Geochronology Isotope Data Subglacial