Geotechnical stratigraphy of Neogene sediments; Maud Rise and Kerguelen Plateau

Online Access: Get full text
doi: 10.1029/AR056p0203
Author(s): Rack, Frank R.; Pittenger, Alan
Author Affiliation(s): Primary:
Texas A&M University, Department of Oceanography, College Station, TX, United States
Volume Title: Antarctic paleoenvironment; a perspective on global change; Part one
Volume Author(s): Kennett, James P., editor; Warnke, Detlef A.
Source: The Antarctic paleoenvironment; a perspective on global change; Part one, edited by James P. Kennett and Detlef A. Warnke. Antarctic Research Series, Vol.56, p.203-230. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0066-4634. ISBN: 978-1-118-66778-1 CODEN: ANTSA4
Note: In English. 54 refs.; illus., incl. 2 tables, sketch maps
Summary: The dominant feature of pelagic sediment accumulation patterns at intermediate water depths in the southern ocean is the sequential northward migration and replacement of a calcareous ooze sedimentary facies by a siliceous ooze facies, following the late Oligocene opening of Drake Passage and the subsequent initiation of the Antarctic Circumpolar Current. Discrete measurements of physical properties (density, porosity, and water content) and continuous whole-core measurements of bulk density and acoustic compressional velocity are evaluated for 6 sites drilled in the southern ocean on submarine rises in open ocean (pelagic) depositional environments south of the Polar Front, a major oceanographic and sedimentologic boundary. At least 6 middle to late Miocene dissolution or productivity events are identified in an accumulation of nannofossil ooze on Maud Rise; others are noted at the ODP sites in the Raggatt Basin and on the southwestern flank of the Kerguelen Plateau. An understanding of the possible interactions between the Antarctic Circumpolar Current system and seafloor topography, as modified by progressive plate tectonic motions and glacio-eustatic fluctuations, is used to develop a hypothesis for explaining the observed sediment accumulation patterns at intermediate water depths of the southern ocean during the Neogene. (Auth. mod.)
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Body waves; Calcium carbonate; Carbonates; Cenozoic; Chronostratigraphy; Cores; Density; Depositional environment; Elastic waves; Gamma-ray methods; Indian Ocean; Kerguelen Plateau; Leg 113; Leg 119; Leg 120; Lithofacies; Lithostratigraphy; Magnetostratigraphy; Maud Rise; Miocene; Neogene; ODP Site 689; ODP Site 690; ODP Site 744; ODP Site 747; ODP Site 748; ODP Site 751; Ocean Drilling Program; P-waves; Paleo-oceanography; Paleocirculation; Physical properties; Porosity; Seismic waves; Siliceous composition; Siliciclastics; Southern Ocean; Tertiary; Velocity; Water content; Weddell Sea
Coordinates: S643101 S643100 E0030600 E0030559
S650938 S650937 E0011218 E0011218
S613440 S613439 E0803528 E0803527
S544841 S544840 E0764739 E0764738
S582627 S582627 E0785854 E0785853
S574334 S574333 E0794854 E0794853
Record ID: 2018032435
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States