Climate change; history documented in Tasmanian waters

Author(s): Exon, Neville
Author Affiliation(s): Primary:
Australian Geological Survey Organisation, Canberra, Australia
Volume Title: Aus Geo News
Source: Aus Geo News, Vol.56, p.10-11. Publisher: Australian Geological Survey Organisation, Canberra, Australia. ISSN: 1035-9338
Note: In English; illus., incl. sketch map
Summary: The opening of the Tasmanian Seaway was vital to the Cenozoic global evolution of the Earth and to the global climate. In mid-March, the Ocean Drilling Program's vessel, Joides Resolution, sailed to sites located at different latitudes in the Indian Ocean, Pacific Ocean, and between the two oceans at water depths from 2475 to 3580 meters. There, drilling took place to test the hypothesis of potential relationships among plate tectonics, circum-Antarctic circulation and global climate, and to time the key events. Changes in sedimentation, oceanography and climate caused by Australia's northward movement from Antarctica in the last 40 million years were studied. Some major scientific questions to be addressed include, but not limited to: when did the Tasmanian Seaway open to shallow water across the South Tasman Rise, and how did this affect east-west biogeographic differences, isotopic differences relating to changing climatic regimes, and geochemical differences? How is circum-Antarctic circulation related to changes in Antarctic climate; what was the nature of the climate on adjacent parts of Antarctica and Australia in the greenhouse period in the middle to late Eocene, and later as the global climate cooled?; and, how were changes in the marine biota tied to changes in the oceanographic system?
Year of Publication: 2000
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic Ocean; Antarctica; Australasia; Australia; Cenozoic; Deep Sea Drilling Project; Eocene; Glacial environment; Glacial geology; Ice caps; Leg 189; Leg 29; Lithofacies; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleocurrents; Paleoecology; Paleoenvironment; Paleogene; South Pacific; South Tasman Rise; Southwest Pacific; Tasman Sea; Tasmania Australia; Tertiary; West Pacific
Coordinates: S483000 S423000 E1500000 E1440000
S570000 S400000 E1770000 E1430000
Record ID: 2002048287
Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute.