Paleogene opening of Drake Passage
The timing of events leading to the earliest connection between the Pacific and Atlantic oceans at Drake Passage is controversial but important, because gateway opening probably had a profound effect on global circulation and climate. A rigorous new analysis of marine geophysical data demonstrates a...
Published in: | Earth and Planetary Science Letters |
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2005
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ftawi:oai:epic.awi.de:12111 2023-09-05T13:12:20+02:00 Paleogene opening of Drake Passage Livermore, R. A. Nankivell, A. Eagles, G. Morris, P. 2005 application/pdf https://epic.awi.de/id/eprint/12111/ https://epic.awi.de/id/eprint/12111/1/Liv2005a.pdf https://doi.org/10.1016/j.epsl.2005.03.027 https://hdl.handle.net/10013/epic.22543 https://hdl.handle.net/10013/epic.22543.d001 unknown https://epic.awi.de/id/eprint/12111/1/Liv2005a.pdf https://hdl.handle.net/10013/epic.22543.d001 Livermore, R. A. , Nankivell, A. , Eagles, G. and Morris, P. (2005) Paleogene opening of Drake Passage , Earth and planetary science letters, 236 (1), pp. 459-470 . doi:10.1016/j.epsl.2005.03.027 <https://doi.org/10.1016/j.epsl.2005.03.027> , hdl:10013/epic.22543 EPIC3Earth and planetary science letters, 236(1), pp. 459-470 Article isiRev 2005 ftawi https://doi.org/10.1016/j.epsl.2005.03.027 2023-08-22T19:49:44Z The timing of events leading to the earliest connection between the Pacific and Atlantic oceans at Drake Passage is controversial but important, because gateway opening probably had a profound effect on global circulation and climate. A rigorous new analysis of marine geophysical data demonstrates a major change in the motion of the South American and Antarctic plates at about 50 Ma, from NS to WNWESE, accompanied by an eightfold increase in separation rate. This would have led to crustal extension and thinning, and perhaps the opening of small oceanic basins, with the probable formation of a shallow (~1000 m) gateway during the Middle Eocene. No change in South AmericanAntarctic motion is observed near the EoceneOligocene boundary, but a deep-water connection developed between 34 and 30 Ma, when continued extension led to the initiation of seafloor spreading at the West Scotia Ridge. These timings correlate with events seen in the oxygen isotope record from benthic foraminera, and support the view that Drake Passage opening was the trigger for abrupt EoceneOligocene climate deterioration and the growth of extensive Antarctic ice sheets. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Drake Passage Pacific West Scotia Ridge ENVELOPE(-56.500,-56.500,-56.833,-56.833) Earth and Planetary Science Letters 236 1-2 459 470 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The timing of events leading to the earliest connection between the Pacific and Atlantic oceans at Drake Passage is controversial but important, because gateway opening probably had a profound effect on global circulation and climate. A rigorous new analysis of marine geophysical data demonstrates a major change in the motion of the South American and Antarctic plates at about 50 Ma, from NS to WNWESE, accompanied by an eightfold increase in separation rate. This would have led to crustal extension and thinning, and perhaps the opening of small oceanic basins, with the probable formation of a shallow (~1000 m) gateway during the Middle Eocene. No change in South AmericanAntarctic motion is observed near the EoceneOligocene boundary, but a deep-water connection developed between 34 and 30 Ma, when continued extension led to the initiation of seafloor spreading at the West Scotia Ridge. These timings correlate with events seen in the oxygen isotope record from benthic foraminera, and support the view that Drake Passage opening was the trigger for abrupt EoceneOligocene climate deterioration and the growth of extensive Antarctic ice sheets. |
format |
Article in Journal/Newspaper |
author |
Livermore, R. A. Nankivell, A. Eagles, G. Morris, P. |
spellingShingle |
Livermore, R. A. Nankivell, A. Eagles, G. Morris, P. Paleogene opening of Drake Passage |
author_facet |
Livermore, R. A. Nankivell, A. Eagles, G. Morris, P. |
author_sort |
Livermore, R. A. |
title |
Paleogene opening of Drake Passage |
title_short |
Paleogene opening of Drake Passage |
title_full |
Paleogene opening of Drake Passage |
title_fullStr |
Paleogene opening of Drake Passage |
title_full_unstemmed |
Paleogene opening of Drake Passage |
title_sort |
paleogene opening of drake passage |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/12111/ https://epic.awi.de/id/eprint/12111/1/Liv2005a.pdf https://doi.org/10.1016/j.epsl.2005.03.027 https://hdl.handle.net/10013/epic.22543 https://hdl.handle.net/10013/epic.22543.d001 |
long_lat |
ENVELOPE(-56.500,-56.500,-56.833,-56.833) |
geographic |
Antarctic Drake Passage Pacific West Scotia Ridge |
geographic_facet |
Antarctic Drake Passage Pacific West Scotia Ridge |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_source |
EPIC3Earth and planetary science letters, 236(1), pp. 459-470 |
op_relation |
https://epic.awi.de/id/eprint/12111/1/Liv2005a.pdf https://hdl.handle.net/10013/epic.22543.d001 Livermore, R. A. , Nankivell, A. , Eagles, G. and Morris, P. (2005) Paleogene opening of Drake Passage , Earth and planetary science letters, 236 (1), pp. 459-470 . doi:10.1016/j.epsl.2005.03.027 <https://doi.org/10.1016/j.epsl.2005.03.027> , hdl:10013/epic.22543 |
op_doi |
https://doi.org/10.1016/j.epsl.2005.03.027 |
container_title |
Earth and Planetary Science Letters |
container_volume |
236 |
container_issue |
1-2 |
container_start_page |
459 |
op_container_end_page |
470 |
_version_ |
1776199883764531200 |