Robert, Christian (2004): Cenozoic environments in the Tasmanian area of the Southern Ocean (ODP Leg 189); inferences from bulk and clay mineralogy

Leg/Site/Hole:
ODP 189
ODP 189 1168
ODP 189 1170
ODP 189 1171
ODP 189 1172
Identifier:
2005-035023
georefid
Creator:
Robert, Christian
Centre d'Oceanologie de Marseille, Marseilles, France
author
Identification:
Cenozoic environments in the Tasmanian area of the Southern Ocean (ODP Leg 189); inferences from bulk and clay mineralogy
2004
In: Exon, Neville F. (editor), Kennett, James P. (editor), Malone, Mitchell (editor), The Cenozoic Southern Ocean; tectonics, sedimentation, and climate change between Australia and Antarctica
American Geophysical Union, Washington, DC, United States
151
43-62
Bulk and clay mineral investigations of 750 samples from four ODP sites off Tasmania provide insights into Cenozoic environments and their link to global climate and oceanography: Dominant lithologies result from diagenetic alteration of biogenic silica to opal CT and quartz in Paleogene sediments, changes in preservation of biogenic elements, and decreased siliciclastics in the Oligocene; Warm conditions sustained by poleward oceanic heat transfer and seasonal precipitation favored chemical weathering and smectite in the early Paleogene; Precipitation and kaolinite increased in the early Miocene until 16.4 Ma, preceding the expansion of East Antarctic ice (15-14 Ma); Aridity and smectite increased in Southern Australia in the middle Miocene (14-12 Ma) after the expansion of East Antarctic ice as the role of general atmospheric circulation in poleward heat transfer amplified. (modif. j. abstr.)
English
Serial
Coverage:Geographic coordinates:
North:-42.0000
West:144.0000East: 150.0000
South:-49.0000
Stratigraphy; Sedimentary petrology; Antarctic Circumpolar Current; Antarctic ice sheet; Antarctica; arid environment; Australasia; Australia; Balleny fracture zone; biogenic processes; Cenozoic; chemical weathering; chlorite; chlorite group; clastic rocks; clay mineralogy; clay minerals; claystone; Cretaceous; diagenesis; East Antarctic ice sheet; East Australian Current; East Tasman Plateau; Eocene; erosion; framework silicates; illite; Indonesian Seaway; isotope ratios; isotopes; kaolinite; land bridges; Leg 189; Maestrichtian; marine sediments; Mesozoic; microfossils; Miocene; Neogene; O-18/O-16; Ocean Drilling Program; ODP Site 1168; ODP Site 1170; ODP Site 1171; ODP Site 1172; Oligocene; opal; opal-CT; oxygen; Pacific Ocean; paleo-oceanography; Paleocene; paleoclimatology; paleoenvironment; Paleogene; pelagic environment; Pliocene; quartz; sedimentary rocks; sediments; Senonian; sheet silicates; silica minerals; silicates; siliceous composition; siliciclastics; siltstone; smectite; South Pacific; South Tasman Rise; Southern Ocean; Southwest Pacific; stable isotopes; Tasman Sea; Tasmania Australia; Tasmanian land-bridge; Tasmanian Seaway; terrestrial environment; terrigenous materials; Tertiary; thermohaline circulation; Upper Cretaceous; weathering; West Pacific; West Tasman fracture zone; Wilkes Land; wind transport; winds;
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