Oligocene to Quaternary sedimentation processes on the Antarctic continental margin, ODP Leg 113, Site 693

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doi: 10.2973/odp.proc.sr.113.193.1990
Author(s): Grobe, Hannes; Fütterer, Dieter Karl; Spiess, Volkhard
Author Affiliation(s): Primary:
Alfred-Wegener Inst. Polar and Mar. Res., Bremerhaven, Federal Republic of Germany
Univ. R.I. at Narragansett, United States
Ocean Drilling Program, United States
Tex. A&M Univ., United States
Lamont-Doherty Geol. Obs., United States
Univ. Oslo, Norway
Alfred Wegener Inst. Polar and Ocean Res., Federal Republic of Germany
Univ. Southampton, United Kingdom
Univ. Tex. at Austin, United States
Woods Hole Oceanogr. Inst., United States
Fed. Inst. Tech., Switzerland
Univ. Tokyo, Japan
Mem. Univ. Newfoundland, Canada
CNRS-Luminy, France
R. Ont. Mus., Canada
Univ. Bremen, Federal Republic of Germany
Wesleyan Univ., United States
Fla. State Univ., United States
Volume Title: Proceedings of the Ocean Drilling Program, Weddell Sea, Antarctica, covering Leg 113 of the cruises of the Drilling Vessel JOIDES Resolution, Valparaiso, Chile, to East Cove, Falkland Islands, sites 689-697, 25 December 1986-11 March 1987
Volume Author(s): Barker, Peter F.; Kennett, James P.; O'Connell, Suzanne B.; Berkowitz, Stephen; Bryant, William R.; Burckle, Lloyd H.; Egeberg, Per Kristian; Fütterer, Dieter Karl; Gersonde, Rainer Erich; Golovchenko, Xenia; Hamilton, Norman; Lawver, Lawrence; Lazarus, David B.; Lonsdale, Malcolm J.; Mohr, Barbara A. R.; Nagao, Toshiyasu; Pereira, Christopher P. G.; Pudsey, Carol J.; Robert, Christian M.; Schandl, Eva S.; Spiess, Volkhard; Stott, Lowell D.; Thomas, Ellen; Thompson, Keith F. M.; Wise, Sherwood W., Jr.; Kennett, Diana M.; Masterson, Amanda; Stewart, Norman J.
Source: Proceedings of the Ocean Drilling Program, Weddell Sea, Antarctica, covering Leg 113 of the cruises of the Drilling Vessel JOIDES Resolution, Valparaiso, Chile, to East Cove, Falkland Islands, sites 689-697, 25 December 1986-11 March 1987, Peter F. Barker, James P. Kennett, Suzanne B. O'Connell, Stephen Berkowitz, William R. Bryant, Lloyd H. Burckle, Per Kristian Egeberg, Dieter Karl Fütterer, Rainer Erich Gersonde, Xenia Golovchenko, Norman Hamilton, Lawrence Lawver, David B. Lazarus, Malcolm J. Lonsdale, Barbara A. R. Mohr, Toshiyasu Nagao, Christopher P. G. Pereira, Carol J. Pudsey, Christian M. Robert, Eva S. Schandl, Volkhard Spiess, Lowell D. Stott, Ellen Thomas, Keith F. M. Thompson, Sherwood W. Wise, Jr., Diana M. Kennett, Amanda Masterson and Norman J. Stewart. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.113, p.121-131. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. 62 refs.; illus. incl. 1 table, sketch map
Summary: Oligocene to Quaternary sediments were recovered from the antarctic continental margin in the eastern Weddell sea. During the middle Oligocene, increasing glacial conditions on the continent are indicated by the presence of glauconitic sands, that are interpreted to have formed on the shelf and then transported down the continental slope by advancing glaciers or as a result of sea-level lowering. The dominance of illite and a relatively high content of chlorite suggest predominantly physical weathering conditions on the continent. The high content of biogenic opal from the late Miocene to the late Pliocene resulted from increased upwelling processes at the continental margin due to increased wind strength related to global cooling. Partial melting of the ice-sheet occurred during an early Pliocene climate optimum, as is shown by an increasing supply of predominantly current-derived sediment with a low mean grain size and peak values of smectite. Primary productivity decreased at about 3 Ma due to the development of a permanent sea-ice cover close to the continent. Isotopic analysis of N. pachyderma produced a stratigraphy which resulted in a calculated sedimentation rate of 1 cm/k.y. during the Pleistocene. Primary productivity was highest during the last three interglacial maxima and decreased during glacial episodes as a result of increasing sea-ice coverage. (Auth. mod.)
Year of Publication: 1990
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Antarctic Ocean; Areal studies; Cenozoic; Clay mineralogy; Clay minerals; Framework silicates; Grain size; Ice rafting; Isotopes; Leg 113; Marine geology; Minerals; O-18/O-16; ODP Site 693; Ocean Drilling Program; Oceanography; Opal; Oxygen; Physical weathering; Processes; Sedimentation; Sediments; Sheet silicates; Silica minerals; Silicates; Smectite; Southern Ocean; Stable isotopes; Transport; Weathering; Weddell Sea
Coordinates: S704954 N704954 W0143424 W0143424
Record ID: 1991051150
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States