Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula
A Fossil Mounded Sedimentary Body (MB) has been identified in the Miocene sedimentary record on the central continental rise west of Adelaide Island, Antarctic Peninsula, using multichannel seismic reflection profiles. The MB has an elongated NE trend away from a group of seamounts, and it developed...
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American Geophysical Union
2004
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ftnerc:oai:nora.nerc.ac.uk:12185 2023-05-15T13:03:53+02:00 Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula Hernández-Molina, F.J. Larter, R.D. Rebesco, M. Maldonado, A. 2004 http://nora.nerc.ac.uk/id/eprint/12185/ http://www.agu.org/journals/gl/gl0422/2004GL020298/index.html unknown American Geophysical Union Hernández-Molina, F.J.; Larter, R.D. orcid:0000-0002-8414-7389 Rebesco, M.; Maldonado, A. 2004 Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula. Geophysical Research Letters, 31 (22), L22606. 5, pp. https://doi.org/10.1029/2004GL020298 <https://doi.org/10.1029/2004GL020298> Marine Sciences Earth Sciences Publication - Article PeerReviewed 2004 ftnerc https://doi.org/10.1029/2004GL020298 2023-02-04T19:27:47Z A Fossil Mounded Sedimentary Body (MB) has been identified in the Miocene sedimentary record on the central continental rise west of Adelaide Island, Antarctic Peninsula, using multichannel seismic reflection profiles. The MB has an elongated NE trend away from a group of seamounts, and it developed between two troughs. We interpret it as a patch drift plastered against the NE (lee) side of an obstacle. The MB's depositional patterns provide the first clear evidence of Early Miocene bottom current activity on the central rise, and they suggest that flow was towards the NE, probably as part of the Antarctic Circumpolar Current. This segment of the rise is, however, presently affected by a SW-flowing branch of Lower Circumpolar Deep Water. The change in bottom water flow took place during the Middle or Late Miocene, and we suggest that it is probably indicative of more widespread palaeoceanographic changes during this period. Article in Journal/Newspaper Adelaide Island Antarc* Antarctic Antarctic Peninsula Natural Environment Research Council: NERC Open Research Archive Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Antarctic Antarctic Peninsula Pacific The Antarctic Geophysical Research Letters 31 22 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Earth Sciences |
spellingShingle |
Marine Sciences Earth Sciences Hernández-Molina, F.J. Larter, R.D. Rebesco, M. Maldonado, A. Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula |
topic_facet |
Marine Sciences Earth Sciences |
description |
A Fossil Mounded Sedimentary Body (MB) has been identified in the Miocene sedimentary record on the central continental rise west of Adelaide Island, Antarctic Peninsula, using multichannel seismic reflection profiles. The MB has an elongated NE trend away from a group of seamounts, and it developed between two troughs. We interpret it as a patch drift plastered against the NE (lee) side of an obstacle. The MB's depositional patterns provide the first clear evidence of Early Miocene bottom current activity on the central rise, and they suggest that flow was towards the NE, probably as part of the Antarctic Circumpolar Current. This segment of the rise is, however, presently affected by a SW-flowing branch of Lower Circumpolar Deep Water. The change in bottom water flow took place during the Middle or Late Miocene, and we suggest that it is probably indicative of more widespread palaeoceanographic changes during this period. |
format |
Article in Journal/Newspaper |
author |
Hernández-Molina, F.J. Larter, R.D. Rebesco, M. Maldonado, A. |
author_facet |
Hernández-Molina, F.J. Larter, R.D. Rebesco, M. Maldonado, A. |
author_sort |
Hernández-Molina, F.J. |
title |
Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula |
title_short |
Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula |
title_full |
Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula |
title_fullStr |
Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula |
title_full_unstemmed |
Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula |
title_sort |
miocene changes in bottom current regime recorded in continental rise sediments on the pacific margin of the antarctic peninsula |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
http://nora.nerc.ac.uk/id/eprint/12185/ http://www.agu.org/journals/gl/gl0422/2004GL020298/index.html |
long_lat |
ENVELOPE(-68.914,-68.914,-67.762,-67.762) |
geographic |
Adelaide Island Antarctic Antarctic Peninsula Pacific The Antarctic |
geographic_facet |
Adelaide Island Antarctic Antarctic Peninsula Pacific The Antarctic |
genre |
Adelaide Island Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Adelaide Island Antarc* Antarctic Antarctic Peninsula |
op_relation |
Hernández-Molina, F.J.; Larter, R.D. orcid:0000-0002-8414-7389 Rebesco, M.; Maldonado, A. 2004 Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific Margin of the Antarctic Peninsula. Geophysical Research Letters, 31 (22), L22606. 5, pp. https://doi.org/10.1029/2004GL020298 <https://doi.org/10.1029/2004GL020298> |
op_doi |
https://doi.org/10.1029/2004GL020298 |
container_title |
Geophysical Research Letters |
container_volume |
31 |
container_issue |
22 |
_version_ |
1766347433517776896 |