Small basins in the Scotia Sea: the Eocene Drake Passage gateway
After isostatic correction for their sedimentary fill, the depths of two small oceanic basins in the southern Scotia Sea suggest that both started to open in mid to late Eocene times. Models of the short magnetic anomaly profiles across the basins provide support for these determinations. The locati...
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ftawi:oai:epic.awi.de:12360 2023-09-05T13:19:07+02:00 Small basins in the Scotia Sea: the Eocene Drake Passage gateway Eagles, G. Livermore, R. A. Morris, P. 2006 https://epic.awi.de/id/eprint/12360/ https://doi.org/10.1016/j.epsl.2005.11.060 https://hdl.handle.net/10013/epic.22786 unknown Eagles, G. , Livermore, R. A. and Morris, P. (2006) Small basins in the Scotia Sea: the Eocene Drake Passage gateway , Earth and planetary science letters, 242 (3), pp. 343-353 . doi:10.1016/j.epsl.2005.11.060 <https://doi.org/10.1016/j.epsl.2005.11.060> , hdl:10013/epic.22786 EPIC3Earth and planetary science letters, 242(3), pp. 343-353 Article isiRev 2006 ftawi https://doi.org/10.1016/j.epsl.2005.11.060 2023-08-22T19:49:51Z After isostatic correction for their sedimentary fill, the depths of two small oceanic basins in the southern Scotia Sea suggest that both started to open in mid to late Eocene times. Models of the short magnetic anomaly profiles across the basins provide support for these determinations. The location of the basins, adjacent to the present-day Drake Passage marine gateway, and the timing of continental stretching leading up to their opening, during the Ypresian (early Eocene) onset of global cooling, mean that their importance is potentially far greater than their small size implies. Extension in the region of the two basins would have opened Drake Passage to shallow or intermediate depth oceanic circulation between the Pacific and Atlantic oceans for the first time. This coincided with a reorganisation of vertical mixing patterns in the global ocean, a shift in the site of carbon sequestration from coal swamps and peatlands to ocean sediments, and the onset of a long decline in atmospheric carbon dioxide concentrations. Cenozoic global cooling may therefore have begun as a result of the shallow opening of Drake Passage. Article in Journal/Newspaper Drake Passage Scotia Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Drake Passage Pacific Scotia Sea Earth and Planetary Science Letters 242 3-4 343 353 |
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 |
After isostatic correction for their sedimentary fill, the depths of two small oceanic basins in the southern Scotia Sea suggest that both started to open in mid to late Eocene times. Models of the short magnetic anomaly profiles across the basins provide support for these determinations. The location of the basins, adjacent to the present-day Drake Passage marine gateway, and the timing of continental stretching leading up to their opening, during the Ypresian (early Eocene) onset of global cooling, mean that their importance is potentially far greater than their small size implies. Extension in the region of the two basins would have opened Drake Passage to shallow or intermediate depth oceanic circulation between the Pacific and Atlantic oceans for the first time. This coincided with a reorganisation of vertical mixing patterns in the global ocean, a shift in the site of carbon sequestration from coal swamps and peatlands to ocean sediments, and the onset of a long decline in atmospheric carbon dioxide concentrations. Cenozoic global cooling may therefore have begun as a result of the shallow opening of Drake Passage. |
format |
Article in Journal/Newspaper |
author |
Eagles, G. Livermore, R. A. Morris, P. |
spellingShingle |
Eagles, G. Livermore, R. A. Morris, P. Small basins in the Scotia Sea: the Eocene Drake Passage gateway |
author_facet |
Eagles, G. Livermore, R. A. Morris, P. |
author_sort |
Eagles, G. |
title |
Small basins in the Scotia Sea: the Eocene Drake Passage gateway |
title_short |
Small basins in the Scotia Sea: the Eocene Drake Passage gateway |
title_full |
Small basins in the Scotia Sea: the Eocene Drake Passage gateway |
title_fullStr |
Small basins in the Scotia Sea: the Eocene Drake Passage gateway |
title_full_unstemmed |
Small basins in the Scotia Sea: the Eocene Drake Passage gateway |
title_sort |
small basins in the scotia sea: the eocene drake passage gateway |
publishDate |
2006 |
url |
https://epic.awi.de/id/eprint/12360/ https://doi.org/10.1016/j.epsl.2005.11.060 https://hdl.handle.net/10013/epic.22786 |
geographic |
Drake Passage Pacific Scotia Sea |
geographic_facet |
Drake Passage Pacific Scotia Sea |
genre |
Drake Passage Scotia Sea |
genre_facet |
Drake Passage Scotia Sea |
op_source |
EPIC3Earth and planetary science letters, 242(3), pp. 343-353 |
op_relation |
Eagles, G. , Livermore, R. A. and Morris, P. (2006) Small basins in the Scotia Sea: the Eocene Drake Passage gateway , Earth and planetary science letters, 242 (3), pp. 343-353 . doi:10.1016/j.epsl.2005.11.060 <https://doi.org/10.1016/j.epsl.2005.11.060> , hdl:10013/epic.22786 |
op_doi |
https://doi.org/10.1016/j.epsl.2005.11.060 |
container_title |
Earth and Planetary Science Letters |
container_volume |
242 |
container_issue |
3-4 |
container_start_page |
343 |
op_container_end_page |
353 |
_version_ |
1776199935064014848 |