Robert, Christian (2004): Cenozoic environments in the Tasmanian area of the Southern Ocean (ODP Leg 189); inferences from bulk and clay mineralogy. American Geophysical Union, Washington, DC, United States, 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, 151, 43-62, georefid:2005-035023

Abstract:
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.)
Coverage:
West: 144.0000 East: 150.0000 North: -42.0000 South: -49.0000
Relations:
Expedition: 189
Site: 189-1168
Site: 189-1170
Site: 189-1171
Site: 189-1172
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=2005-035023 (c.f. for more detailed metadata)
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