An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica
An anomalous Upper Jurassic limestone bed, 3 m thick, is present within the volcaniclastic infill of a forearc basin, exposed on Alexander Island, Antarctica. The limestone, formally designated the Gateway Pass Limestone Bed, contains laminated crusts and blocks, including hardgrounds, showing radia...
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Society for Sedimentary Geology
1995
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Online Access: | http://nora.nerc.ac.uk/id/eprint/515637/ https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D |
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ftnerc:oai:nora.nerc.ac.uk:515637 2023-05-15T13:15:15+02:00 An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica Kelly, Simon R.A. Ditchfield, Peter W. Doubleday, Paul A. Marshall, James D. 1995-04 http://nora.nerc.ac.uk/id/eprint/515637/ https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D unknown Society for Sedimentary Geology Kelly, Simon R.A.; Ditchfield, Peter W.; Doubleday, Paul A.; Marshall, James D. 1995 An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica. Journal of Sedimentary Research, Vol. 65 (2a). 274-282. https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D <https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D> Publication - Article PeerReviewed 1995 ftnerc https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D 2023-02-04T19:44:09Z An anomalous Upper Jurassic limestone bed, 3 m thick, is present within the volcaniclastic infill of a forearc basin, exposed on Alexander Island, Antarctica. The limestone, formally designated the Gateway Pass Limestone Bed, contains laminated crusts and blocks, including hardgrounds, showing radial-fibrous and botryoidal calcite cements. Carbon isotope values are very negative (delta 13 C of -33.5 per thousand to -44.6 per thousand PDB) indicating a methane-oxidation origin for the carbonate. The limestone bed formed around a submarine cold seep in the Antarctic Peninsula forearc basin adjacent to the accretionary prism. In contrast to adjacent nearly barren sea floor the limestone also yields a "benthic island" assemblage containing abundant gastropods and bivalves. The seep is directly comparable to certain Jurassic seeps at the convergent margin of the northeast Pacific, and both are related to subduction at the eastern proto-Pacific margin. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Antarctica Journal Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Pacific Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Fossil Bluff ENVELOPE(-68.274,-68.274,-71.332,-71.332) Gateway Pass ENVELOPE(-68.732,-68.732,-71.650,-71.650) SEPM Journal of Sedimentary Research Vol. 65A |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
An anomalous Upper Jurassic limestone bed, 3 m thick, is present within the volcaniclastic infill of a forearc basin, exposed on Alexander Island, Antarctica. The limestone, formally designated the Gateway Pass Limestone Bed, contains laminated crusts and blocks, including hardgrounds, showing radial-fibrous and botryoidal calcite cements. Carbon isotope values are very negative (delta 13 C of -33.5 per thousand to -44.6 per thousand PDB) indicating a methane-oxidation origin for the carbonate. The limestone bed formed around a submarine cold seep in the Antarctic Peninsula forearc basin adjacent to the accretionary prism. In contrast to adjacent nearly barren sea floor the limestone also yields a "benthic island" assemblage containing abundant gastropods and bivalves. The seep is directly comparable to certain Jurassic seeps at the convergent margin of the northeast Pacific, and both are related to subduction at the eastern proto-Pacific margin. |
format |
Article in Journal/Newspaper |
author |
Kelly, Simon R.A. Ditchfield, Peter W. Doubleday, Paul A. Marshall, James D. |
spellingShingle |
Kelly, Simon R.A. Ditchfield, Peter W. Doubleday, Paul A. Marshall, James D. An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica |
author_facet |
Kelly, Simon R.A. Ditchfield, Peter W. Doubleday, Paul A. Marshall, James D. |
author_sort |
Kelly, Simon R.A. |
title |
An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica |
title_short |
An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica |
title_full |
An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica |
title_fullStr |
An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica |
title_full_unstemmed |
An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica |
title_sort |
upper jurassic methane-seep limestone from the fossil bluff group forearc basin of alexander island, antarctica |
publisher |
Society for Sedimentary Geology |
publishDate |
1995 |
url |
http://nora.nerc.ac.uk/id/eprint/515637/ https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-68.274,-68.274,-71.332,-71.332) ENVELOPE(-68.732,-68.732,-71.650,-71.650) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Pacific Alexander Island Fossil Bluff Gateway Pass |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Pacific Alexander Island Fossil Bluff Gateway Pass |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Antarctica Journal |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctica Antarctica Journal |
op_relation |
Kelly, Simon R.A.; Ditchfield, Peter W.; Doubleday, Paul A.; Marshall, James D. 1995 An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica. Journal of Sedimentary Research, Vol. 65 (2a). 274-282. https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D <https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D> |
op_doi |
https://doi.org/10.1306/D426809A-2B26-11D7-8648000102C1865D |
container_title |
SEPM Journal of Sedimentary Research |
container_volume |
Vol. 65A |
_version_ |
1766267724836634624 |