Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway
Ocean Drilling Program (ODP) Leg 189 drilled five sites in bathyal depths on submerged continental blocks in the Tasmanian Gateway, to help refine the hypothesis that its opening near the Eocene/Oligocene boundary led to formation of the Antarctic Circumpolar Current (ACC), progressive thermal isola...
Other Authors: | |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
data.gov.au
|
Subjects: | |
Online Access: | https://researchdata.edu.au/leg-189-synthesis-tasmanian-gateway/1931922 http://data.gov.au/dataset/a720efe3-da42-4fc2-8f89-4989c852591f |
id |
ftands:oai:ands.org.au::1931922 |
---|---|
record_format |
openpolar |
spelling |
ftands:oai:ands.org.au::1931922 2023-09-05T13:13:57+02:00 Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway Geoscience Australia (isOwnedBy) Spatial: 141.5,-48.0 152.0,-48.0 152.0,-37.75 141.5,-37.75 141.5,-48.0 Spatial: true https://researchdata.edu.au/leg-189-synthesis-tasmanian-gateway/1931922 http://data.gov.au/dataset/a720efe3-da42-4fc2-8f89-4989c852591f unknown data.gov.au https://researchdata.edu.au/leg-189-synthesis-tasmanian-gateway/1931922 http://data.gov.au/dataset/a720efe3-da42-4fc2-8f89-4989c852591f leg-189-synthesis-cretaceous-holocene-history-of-the-tasmanian-gateway Geoscience Australia Earth Sciences External Publication Scientific Journal Paper marine dataset ftands 2023-08-14T22:58:27Z Ocean Drilling Program (ODP) Leg 189 drilled five sites in bathyal depths on submerged continental blocks in the Tasmanian Gateway, to help refine the hypothesis that its opening near the Eocene/Oligocene boundary led to formation of the Antarctic Circumpolar Current (ACC), progressive thermal isolation of Antarctica, climatic cooling, and development of an Antarctic ice sheet. In all, 4539 m of marine and largely continuous upper Maastrichtian to Holocene core were recovered, with a recovery rate of 89%. The sedimentary sequence broadly consists of shallow marine mudstones until the late Eocene, glauconitic siltstones during the late Eocene, and pelagic carbonates thereafter. The microfossils in the mudstones and siltstones are largely palynomorphs and diatoms, and those in the carbonates are largely nannofossils and foraminifers.\n\nDuring the Late Cretaceous, northward movement of Australia away from Antarctica commenced, forming the Australo-Antarctic Gulf (AAG). However, a Tasmanian land bridge at 70?-65?S almost completely blocked the eastern end of the widening AAG until the late Eocene, there being no evidence of extensive current circulation across the ridge until the earliest Oligocene. Prior to the Oligocene, muddy marine siliciclastic sediments were deposited in temperate seas. During the late Eocene, the northeastern AAG was warmer and less ventilated than the gradually widening southwest sector of the Pacific Ocean, which was affected by a cool, northwesterly flowing boundary current ? a difference that may have existed since the Maastrichtian. In the late Eocene (~37 Ma), the Tasmanian land bridge and its broad shelves began to subside, currents swept the still-shallow offshore areas, and condensed glauconitic siltstones were deposited. Palynological and diatom evidence suggest a general cooling. The southwestern South Tasman Rise finally separated from Antarctica at the time of the Eocene/Oligocene boundary (~33.5 Ma), the rise subsided, and the continental margin of Tasmania collapsed. The ... Dataset Antarc* Antarctic Antarctica Ice Sheet Research Data Australia (Australian National Data Service - ANDS) Antarctic Pacific South Tasman Rise ENVELOPE(148.000,148.000,-47.500,-47.500) The Antarctic |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
Earth Sciences External Publication Scientific Journal Paper marine |
spellingShingle |
Earth Sciences External Publication Scientific Journal Paper marine Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway |
topic_facet |
Earth Sciences External Publication Scientific Journal Paper marine |
description |
Ocean Drilling Program (ODP) Leg 189 drilled five sites in bathyal depths on submerged continental blocks in the Tasmanian Gateway, to help refine the hypothesis that its opening near the Eocene/Oligocene boundary led to formation of the Antarctic Circumpolar Current (ACC), progressive thermal isolation of Antarctica, climatic cooling, and development of an Antarctic ice sheet. In all, 4539 m of marine and largely continuous upper Maastrichtian to Holocene core were recovered, with a recovery rate of 89%. The sedimentary sequence broadly consists of shallow marine mudstones until the late Eocene, glauconitic siltstones during the late Eocene, and pelagic carbonates thereafter. The microfossils in the mudstones and siltstones are largely palynomorphs and diatoms, and those in the carbonates are largely nannofossils and foraminifers.\n\nDuring the Late Cretaceous, northward movement of Australia away from Antarctica commenced, forming the Australo-Antarctic Gulf (AAG). However, a Tasmanian land bridge at 70?-65?S almost completely blocked the eastern end of the widening AAG until the late Eocene, there being no evidence of extensive current circulation across the ridge until the earliest Oligocene. Prior to the Oligocene, muddy marine siliciclastic sediments were deposited in temperate seas. During the late Eocene, the northeastern AAG was warmer and less ventilated than the gradually widening southwest sector of the Pacific Ocean, which was affected by a cool, northwesterly flowing boundary current ? a difference that may have existed since the Maastrichtian. In the late Eocene (~37 Ma), the Tasmanian land bridge and its broad shelves began to subside, currents swept the still-shallow offshore areas, and condensed glauconitic siltstones were deposited. Palynological and diatom evidence suggest a general cooling. The southwestern South Tasman Rise finally separated from Antarctica at the time of the Eocene/Oligocene boundary (~33.5 Ma), the rise subsided, and the continental margin of Tasmania collapsed. The ... |
author2 |
Geoscience Australia (isOwnedBy) |
format |
Dataset |
title |
Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway |
title_short |
Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway |
title_full |
Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway |
title_fullStr |
Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway |
title_full_unstemmed |
Leg 189 Synthesis: Cretaceous-Holocene History of the Tasmanian Gateway |
title_sort |
leg 189 synthesis: cretaceous-holocene history of the tasmanian gateway |
publisher |
data.gov.au |
url |
https://researchdata.edu.au/leg-189-synthesis-tasmanian-gateway/1931922 http://data.gov.au/dataset/a720efe3-da42-4fc2-8f89-4989c852591f |
op_coverage |
Spatial: 141.5,-48.0 152.0,-48.0 152.0,-37.75 141.5,-37.75 141.5,-48.0 Spatial: true |
long_lat |
ENVELOPE(148.000,148.000,-47.500,-47.500) |
geographic |
Antarctic Pacific South Tasman Rise The Antarctic |
geographic_facet |
Antarctic Pacific South Tasman Rise The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Geoscience Australia |
op_relation |
https://researchdata.edu.au/leg-189-synthesis-tasmanian-gateway/1931922 http://data.gov.au/dataset/a720efe3-da42-4fc2-8f89-4989c852591f leg-189-synthesis-cretaceous-holocene-history-of-the-tasmanian-gateway |
_version_ |
1776205062027083776 |