Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica
Thermogenic hydrocarbons, formed by the thermal alteration of organic matter, are encountered in several piston core stations in the King George Basin, Anatarctica. These hemipelagic sediments are being deposited in an area of active hydrothermalism, associated with the back-arc spreading in the Bra...
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1990
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.707463 2023-05-15T13:42:09+02:00 Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica Whiticar, Michael J Suess, Erwin MEDIAN LATITUDE: -62.423613 * MEDIAN LONGITUDE: -58.199947 * SOUTH-BOUND LATITUDE: -63.233333 * WEST-BOUND LONGITUDE: -61.650000 * NORTH-BOUND LATITUDE: -62.223330 * EAST-BOUND LONGITUDE: -57.433330 * DATE/TIME START: 1985-11-15T00:00:00 * DATE/TIME END: 1985-11-27T00:00:00 1990-11-18 application/zip, 10 datasets https://doi.pangaea.de/10.1594/PANGAEA.707463 https://doi.org/10.1594/PANGAEA.707463 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.707463 https://doi.org/10.1594/PANGAEA.707463 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Whiticar, Michael J; Suess, Erwin (1990): Hydrothermal hydrocarbon gases in the sediments of King George Basin, Bransfield Strait, Antarctica. Applied Geochemistry, 5(1-2), 135-147, https://doi.org/10.1016/0883-2927(90)90044-6 ANT-IV/2 Bransfield Strait Deception_Is Deception Island Geological sample GEOS Gravity corer (Kiel type) King George Island Antarctic Peninsula Polarstern PS08 PS08/279 PS08/284 PS08/291 PS08/295 PS08/306 PS1327-1 PS1333-1 PS1340-1 PS1341-1 PS1342-1 PS1343-1 PS1346-1 PS1347-1 PS1357-2 SL Dataset 1990 ftpangaea https://doi.org/10.1594/PANGAEA.707463 https://doi.org/10.1016/0883-2927(90)90044-6 2023-01-20T07:31:16Z Thermogenic hydrocarbons, formed by the thermal alteration of organic matter, are encountered in several piston core stations in the King George Basin, Anatarctica. These hemipelagic sediments are being deposited in an area of active hydrothermalism, associated with the back-arc spreading in the Bransfield Strait. The lateral extent of sediments infiltrated by the hydrothermally influenced interstitial fluids is characterized by basalt diapiric intrusions and is delineated by an acoustically turbid zone in the sediments of the eastern part of the basin. Iron-sulphide-bearing veins and fractures cut across the sediment in several cores; they appear to be conduits for flow of hydrothermally altered fluids. These zones have the highest C2+ and ethene contents. The thermogenic hydrocarbons have molecular C1/(C2 + C3) ratios typically < 50 and delta13CH4 values between -38‰ and -48‰, indicating an organic source which has undergone strong thermal stress. Several sediment cores also have mixed gas signatures, which indicate the presence of substantial amounts of bacterial gas, predominantly methane. Hydrocarbon generation in the King George Basin is thought to be a local phenomenon, resulting from submarine volcanism with temperatures in the range 70-150°C. There are no apparent seepages of hydrocarbons into the water column, and it is not believed that significant accumulation of thermogenic hydrocarbons reside in the basin. Dataset Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Deception Island King George Island PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Antarctic Peninsula Bransfield Strait Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) King George Island ENVELOPE(-61.650000,-57.433330,-62.223330,-63.233333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-IV/2 Bransfield Strait Deception_Is Deception Island Geological sample GEOS Gravity corer (Kiel type) King George Island Antarctic Peninsula Polarstern PS08 PS08/279 PS08/284 PS08/291 PS08/295 PS08/306 PS1327-1 PS1333-1 PS1340-1 PS1341-1 PS1342-1 PS1343-1 PS1346-1 PS1347-1 PS1357-2 SL |
spellingShingle |
ANT-IV/2 Bransfield Strait Deception_Is Deception Island Geological sample GEOS Gravity corer (Kiel type) King George Island Antarctic Peninsula Polarstern PS08 PS08/279 PS08/284 PS08/291 PS08/295 PS08/306 PS1327-1 PS1333-1 PS1340-1 PS1341-1 PS1342-1 PS1343-1 PS1346-1 PS1347-1 PS1357-2 SL Whiticar, Michael J Suess, Erwin Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica |
topic_facet |
ANT-IV/2 Bransfield Strait Deception_Is Deception Island Geological sample GEOS Gravity corer (Kiel type) King George Island Antarctic Peninsula Polarstern PS08 PS08/279 PS08/284 PS08/291 PS08/295 PS08/306 PS1327-1 PS1333-1 PS1340-1 PS1341-1 PS1342-1 PS1343-1 PS1346-1 PS1347-1 PS1357-2 SL |
description |
Thermogenic hydrocarbons, formed by the thermal alteration of organic matter, are encountered in several piston core stations in the King George Basin, Anatarctica. These hemipelagic sediments are being deposited in an area of active hydrothermalism, associated with the back-arc spreading in the Bransfield Strait. The lateral extent of sediments infiltrated by the hydrothermally influenced interstitial fluids is characterized by basalt diapiric intrusions and is delineated by an acoustically turbid zone in the sediments of the eastern part of the basin. Iron-sulphide-bearing veins and fractures cut across the sediment in several cores; they appear to be conduits for flow of hydrothermally altered fluids. These zones have the highest C2+ and ethene contents. The thermogenic hydrocarbons have molecular C1/(C2 + C3) ratios typically < 50 and delta13CH4 values between -38‰ and -48‰, indicating an organic source which has undergone strong thermal stress. Several sediment cores also have mixed gas signatures, which indicate the presence of substantial amounts of bacterial gas, predominantly methane. Hydrocarbon generation in the King George Basin is thought to be a local phenomenon, resulting from submarine volcanism with temperatures in the range 70-150°C. There are no apparent seepages of hydrocarbons into the water column, and it is not believed that significant accumulation of thermogenic hydrocarbons reside in the basin. |
format |
Dataset |
author |
Whiticar, Michael J Suess, Erwin |
author_facet |
Whiticar, Michael J Suess, Erwin |
author_sort |
Whiticar, Michael J |
title |
Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica |
title_short |
Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica |
title_full |
Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica |
title_fullStr |
Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica |
title_full_unstemmed |
Analyses of hydrocarbon gases and sulphate in sediments from the King George Basin, Antarctica |
title_sort |
analyses of hydrocarbon gases and sulphate in sediments from the king george basin, antarctica |
publisher |
PANGAEA |
publishDate |
1990 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.707463 https://doi.org/10.1594/PANGAEA.707463 |
op_coverage |
MEDIAN LATITUDE: -62.423613 * MEDIAN LONGITUDE: -58.199947 * SOUTH-BOUND LATITUDE: -63.233333 * WEST-BOUND LONGITUDE: -61.650000 * NORTH-BOUND LATITUDE: -62.223330 * EAST-BOUND LONGITUDE: -57.433330 * DATE/TIME START: 1985-11-15T00:00:00 * DATE/TIME END: 1985-11-27T00:00:00 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) ENVELOPE(-61.650000,-57.433330,-62.223330,-63.233333) |
geographic |
Antarctic Antarctic Peninsula Bransfield Strait Deception Island King George Island |
geographic_facet |
Antarctic Antarctic Peninsula Bransfield Strait Deception Island King George Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Deception Island King George Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait Deception Island King George Island |
op_source |
Supplement to: Whiticar, Michael J; Suess, Erwin (1990): Hydrothermal hydrocarbon gases in the sediments of King George Basin, Bransfield Strait, Antarctica. Applied Geochemistry, 5(1-2), 135-147, https://doi.org/10.1016/0883-2927(90)90044-6 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.707463 https://doi.org/10.1594/PANGAEA.707463 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.707463 https://doi.org/10.1016/0883-2927(90)90044-6 |
_version_ |
1766163417891078144 |