Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation
The opening of Southern Ocean gateways was critical to the formation of the Antarctic Circumpolar Current and may have led to Cenozoic global cooling and Antarctic glaciation. Drake Passage was probably the final barrier to deep circumpolar ocean currents, but the timing of opening is unclear, becau...
Published in: | Geology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of America
2004
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/18847 https://doi.org/10.1130/G20537.1 |
id |
ftcsic:oai:digital.csic.es:10261/18847 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/18847 2024-02-11T09:57:38+01:00 Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation Livermore, Roy Eagles, Graeme Peter Morris, Peter Maldonado, Andrés 2004-09 13824 bytes application/vnd.ms-excel http://hdl.handle.net/10261/18847 https://doi.org/10.1130/G20537.1 en eng Geological Society of America http://dx.doi.org/10.1130/G20537.1 Geology 32(9): 797-800 (2004) 1553-040X http://hdl.handle.net/10261/18847 doi:10.1130/G20537.1 none Gateways Southern Ocean Antarctic Circumpolar Current Shackleton Fracture Zone Transverse ridge artículo http://purl.org/coar/resource_type/c_6501 2004 ftcsic https://doi.org/10.1130/G20537.1 2024-01-16T09:24:31Z The opening of Southern Ocean gateways was critical to the formation of the Antarctic Circumpolar Current and may have led to Cenozoic global cooling and Antarctic glaciation. Drake Passage was probably the final barrier to deep circumpolar ocean currents, but the timing of opening is unclear, because the Shackleton Fracture Zone could have blocked the gateway until the early Miocene. Geophysical and geochemical evidence presented here suggests that the Shackleton Fracture Zone is an oceanic transverse ridge, formed by uplift related to compression across the fracture zone since ca. 8 Ma. Hence, there was formerly (i.e., in the Miocene) no barrier to deep circulation through Drake Passage, and a deep-water connection between the Pacific and Atlantic Oceans was probably established soon after spreading began in Drake Passage during the early Oligocene. Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Drake Passage Pacific Shackleton Shackleton Fracture Zone ENVELOPE(-60.000,-60.000,-60.000,-60.000) Southern Ocean The Antarctic Geology 32 9 797 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Gateways Southern Ocean Antarctic Circumpolar Current Shackleton Fracture Zone Transverse ridge |
spellingShingle |
Gateways Southern Ocean Antarctic Circumpolar Current Shackleton Fracture Zone Transverse ridge Livermore, Roy Eagles, Graeme Peter Morris, Peter Maldonado, Andrés Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation |
topic_facet |
Gateways Southern Ocean Antarctic Circumpolar Current Shackleton Fracture Zone Transverse ridge |
description |
The opening of Southern Ocean gateways was critical to the formation of the Antarctic Circumpolar Current and may have led to Cenozoic global cooling and Antarctic glaciation. Drake Passage was probably the final barrier to deep circumpolar ocean currents, but the timing of opening is unclear, because the Shackleton Fracture Zone could have blocked the gateway until the early Miocene. Geophysical and geochemical evidence presented here suggests that the Shackleton Fracture Zone is an oceanic transverse ridge, formed by uplift related to compression across the fracture zone since ca. 8 Ma. Hence, there was formerly (i.e., in the Miocene) no barrier to deep circulation through Drake Passage, and a deep-water connection between the Pacific and Atlantic Oceans was probably established soon after spreading began in Drake Passage during the early Oligocene. Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Livermore, Roy Eagles, Graeme Peter Morris, Peter Maldonado, Andrés |
author_facet |
Livermore, Roy Eagles, Graeme Peter Morris, Peter Maldonado, Andrés |
author_sort |
Livermore, Roy |
title |
Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation |
title_short |
Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation |
title_full |
Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation |
title_fullStr |
Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation |
title_full_unstemmed |
Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation |
title_sort |
shackleton fracture zone: no barrier to early circumpolar ocean circulation |
publisher |
Geological Society of America |
publishDate |
2004 |
url |
http://hdl.handle.net/10261/18847 https://doi.org/10.1130/G20537.1 |
long_lat |
ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
geographic |
Antarctic Drake Passage Pacific Shackleton Shackleton Fracture Zone Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Pacific Shackleton Shackleton Fracture Zone Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
http://dx.doi.org/10.1130/G20537.1 Geology 32(9): 797-800 (2004) 1553-040X http://hdl.handle.net/10261/18847 doi:10.1130/G20537.1 |
op_rights |
none |
op_doi |
https://doi.org/10.1130/G20537.1 |
container_title |
Geology |
container_volume |
32 |
container_issue |
9 |
container_start_page |
797 |
_version_ |
1790593175201513472 |