Paleogene calcareous nannofossil record of the Tasmanian gateway
The opening of the Tasmanian Gateway between Australia and Antarctica has long been considered a critical element in the initiation of the Antarctic Circumpolar Current, thermal isolation of Antarctica, and Cenozoic global cooling. The timing for the opening of the gateway to shallow-water circulati...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.679777 2024-09-15T17:42:41+00:00 Paleogene calcareous nannofossil record of the Tasmanian gateway Wei, Wuchang MEDIAN LATITUDE: -45.554891 * MEDIAN LONGITUDE: 147.375646 * SOUTH-BOUND LATITUDE: -48.499900 * WEST-BOUND LONGITUDE: 144.412700 * NORTH-BOUND LATITUDE: -42.609680 * EAST-BOUND LONGITUDE: 149.928433 * DATE/TIME START: 2000-02-29T17:30:00 * DATE/TIME END: 2000-04-22T00:00:00 2004 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.679777 https://doi.org/10.1594/PANGAEA.679777 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.679777 https://doi.org/10.1594/PANGAEA.679777 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Wei, Wuchang (2004): Opening of the Australia-Antarctica Gateway as dated by nannofossils. Marine Micropaleontology, 52(1-4), 133-152, https://doi.org/10.1016/j.marmicro.2004.04.008 189-1168A 189-1170 189-1171 189-1172 COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean Tasman Sea dataset publication series 2004 ftpangaea https://doi.org/10.1594/PANGAEA.67977710.1016/j.marmicro.2004.04.008 2024-07-24T02:31:42Z The opening of the Tasmanian Gateway between Australia and Antarctica has long been considered a critical element in the initiation of the Antarctic Circumpolar Current, thermal isolation of Antarctica, and Cenozoic global cooling. The timing for the opening of the gateway to shallow-water circulation and subsequently to deep-water circulation was poorly known, however, and the dating of these events was a major objective of ODP Leg 189. Nannofossil data from Leg 189 sites and DSDP Site 281 in the Tasmanian Gateway suggest a 41-42 Ma age for the initiation of widespread glauconite deposition in the region, which coincided with a sharp drop in sedimentation rate. This is interpreted to be the opening of the gateway to shallow-water circulation, which occurred within the middle of the 51-33 Ma long-term cooling. The change from siliciclastic sediments to pelagic carbonates, the most conspicuous sedimentological and paleontological change in the region for the last 70 Ma and presumably the indicator for the opening of the gateway to deep-water circulation, is dated at about 31 Ma. This event is more than 2 my younger than the major high-latitude cooling in the earliest Oligocene, and thus cannot be the cause for the latter. Other/Unknown Material Antarc* Antarctic Antarctica PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(144.412700,149.928433,-42.609680,-48.499900) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
189-1168A 189-1170 189-1171 189-1172 COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean Tasman Sea |
spellingShingle |
189-1168A 189-1170 189-1171 189-1172 COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean Tasman Sea Wei, Wuchang Paleogene calcareous nannofossil record of the Tasmanian gateway |
topic_facet |
189-1168A 189-1170 189-1171 189-1172 COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean Tasman Sea |
description |
The opening of the Tasmanian Gateway between Australia and Antarctica has long been considered a critical element in the initiation of the Antarctic Circumpolar Current, thermal isolation of Antarctica, and Cenozoic global cooling. The timing for the opening of the gateway to shallow-water circulation and subsequently to deep-water circulation was poorly known, however, and the dating of these events was a major objective of ODP Leg 189. Nannofossil data from Leg 189 sites and DSDP Site 281 in the Tasmanian Gateway suggest a 41-42 Ma age for the initiation of widespread glauconite deposition in the region, which coincided with a sharp drop in sedimentation rate. This is interpreted to be the opening of the gateway to shallow-water circulation, which occurred within the middle of the 51-33 Ma long-term cooling. The change from siliciclastic sediments to pelagic carbonates, the most conspicuous sedimentological and paleontological change in the region for the last 70 Ma and presumably the indicator for the opening of the gateway to deep-water circulation, is dated at about 31 Ma. This event is more than 2 my younger than the major high-latitude cooling in the earliest Oligocene, and thus cannot be the cause for the latter. |
format |
Other/Unknown Material |
author |
Wei, Wuchang |
author_facet |
Wei, Wuchang |
author_sort |
Wei, Wuchang |
title |
Paleogene calcareous nannofossil record of the Tasmanian gateway |
title_short |
Paleogene calcareous nannofossil record of the Tasmanian gateway |
title_full |
Paleogene calcareous nannofossil record of the Tasmanian gateway |
title_fullStr |
Paleogene calcareous nannofossil record of the Tasmanian gateway |
title_full_unstemmed |
Paleogene calcareous nannofossil record of the Tasmanian gateway |
title_sort |
paleogene calcareous nannofossil record of the tasmanian gateway |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.679777 https://doi.org/10.1594/PANGAEA.679777 |
op_coverage |
MEDIAN LATITUDE: -45.554891 * MEDIAN LONGITUDE: 147.375646 * SOUTH-BOUND LATITUDE: -48.499900 * WEST-BOUND LONGITUDE: 144.412700 * NORTH-BOUND LATITUDE: -42.609680 * EAST-BOUND LONGITUDE: 149.928433 * DATE/TIME START: 2000-02-29T17:30:00 * DATE/TIME END: 2000-04-22T00:00:00 |
long_lat |
ENVELOPE(144.412700,149.928433,-42.609680,-48.499900) |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Supplement to: Wei, Wuchang (2004): Opening of the Australia-Antarctica Gateway as dated by nannofossils. Marine Micropaleontology, 52(1-4), 133-152, https://doi.org/10.1016/j.marmicro.2004.04.008 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.679777 https://doi.org/10.1594/PANGAEA.679777 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.67977710.1016/j.marmicro.2004.04.008 |
_version_ |
1810489367195549696 |