The opening of the Tasmanian Gateway drove global Cenozoic paleoclimatic and paleoceanographic changes; results of Leg 189

Author(s): Exon, N.; Kennett, J.; Malone, M.; Brinkhuis, Henk; Chaproniere, George; Ennyu, Atsuhito; Fothergill, Patrick; Fuller, Michael; Grauert, Marianne; Hill, Peter; Janecek, Tom; Kelly, Clay; Latimer, Jennifer; McGonigal, Kristeen; Nees, Stefan; Ninnemann, Ulysses; Nuernberg, Durk; Pekar, Stephen; Pellaton, Caroline; Pfuhl, Helen; Robert, Christian; Röhl, Ursula; Schellenberg, Stephen; Shevenell, Amelia; Stickley, Catherine; Suzuki, Noritoshi; Touchard, Yannick; Wei, Wuchang; White, Tim
Ocean Drilling Program, Leg 189, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Australian Geological Survey Organisation, Canberra, A.C.T., Australia
Other:
University of California at Santa Barbara, United States
Ocean Drilling Program, United States
Volume Title: JOIDES Journal
Source: JOIDES Journal, 26(2), p.11-18. Publisher: Joint Oceanographic Institutions for Deep Earth Sampling, Palisades, NY, United States. ISSN: 0734-5615
Note: In English. 16 refs.; illus., incl. geol. sketch maps, strat. col.
Summary: Results from the Ocean Drilling Program Leg 189 in the offshore Tasmanian area provide data on the Cenozoic evolution of the Antarctic Circumpolar Current. The opening of the Tasmanian Gateway in the latest Eocene drove global paleoclimate resulting in cooling trends and ice-sheet formation in the Antarctic and eventually in the Northern Hemisphere. Changes as the Tasmanian land bridge subsided are documented through slowing sedimentation rates in the Neogene. The subsequent widening of the Antarctic Circumpolar Current isolated Antarctica from warm water influences resulting in the current "Ice House". Further microfossil group correlations using samples retrieved during drilling will be used to enhance temperature studies. (SNT)
Year of Publication: 2000
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Antarctic Circumpolar Current; Antarctica; Atlantic Ocean; Australasia; Australia; Cenozoic; Climate effects; Cretaceous; DSDP Site 280; DSDP Site 281; DSDP Site 282; Deep Sea Drilling Project; Drake Passage; Foraminifera; Glacial geology; Ice sheets; Invertebrata; Leg 189; Leg 29; Lithofacies; Mesozoic; Microfossils; Nannofossils; ODP Site 1168; ODP Site 1169; ODP Site 1170; ODP Site 1171; ODP Site 1172; Ocean Drilling Program; Organic compounds; Pacific Ocean; Paleo-oceanography; Paleobathymetry; Paleoclimatology; Paleogeography; Plantae; Protista; Sedimentation; Sedimentation rates; South Atlantic; South Pacific; Southern Ocean; Tasmania Australia; Tasmanian Gateway; Tertiary; Total organic carbon
Coordinates: S480000 S420000 E1500000 E1420000
Record ID: 2010013118
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.