Ice sheet history from Antarctic continental margin sediments; the ANTOSTRAT approach

Author(s): Barker, P. F.; Barrett, P. J.; Camerlenghi, Angelo; Cooper, A. K.; Davey, F. J.; Domack, E. W.; Escutia, Carlota; Kristoffersen, Y.; O'Brien, P. E.
Author Affiliation(s): Primary:
British Antarctic Survey, Cambridge, United Kingdom
Victoria University of Wellington, New Zealand
Osservatorio Geofisico Sperimentale, Italy
U. S. Geological Survey, United States
Institute of Geological and Nuclear Sciences, New Zealand
Hamilton College, United States
University of Bergen, Norway
Australian Geological Survey Organisation, Australia
Volume Title: Terra Antartica
Source: Terra Antartica, 5(4), p.737-760. Publisher: Universita di Siena. Dipartimento di Scienze della Terra, Siena, Italy. ISSN: 1122-8628
Note: In English. 115 refs.; illus., incl. sects., geol. sketch map
Summary: The Antarctic Ice Sheet is today an important part of the global climate engine, and probably has been so for most of its long existence. However, the details of its history are poorly known, despite the measurement and use, over two decades, of low-latitude proxies of ice sheet volume. An additional way of determining ice sheet history is now available, based on understanding terrigenous sediment transport and deposition under a glacial regime. It requires direct sampling of the prograded wedge of glacial sediments deposited at the Antarctic continental margin (and of derived sediments on the continental rise) at a small number of key sites, and combines the resulting data using numerical models of ice sheet development. The new phase of sampling is embodied mainly in a suite of proposals to the Ocean Drilling Program, generated by separate regional proponent groups co-ordinated through ANTOSTRAT (the Antarctic Offshore Acoustic Stratigraphy initiative). The first set of margin sites has now been drilled as ODP Leg 178 to the Antarctic Peninsula margin, and a first, short season of inshore drilling at Cape Roberts, Ross Sea, has been completed. Leg 178 and Cape Roberts drilling results are described briefly here, together with an outline of key elements of the overall strategy for determining glacial history, and of the potential contributions of drilling other Antarctic margins investigated by ANTOSTRAT. ODP Leg 178 also recovered continuous ultra-high-resolution Holocene biogenic sections at two sites within a protected, glacially-overdeepened basin (Palmer Deep) on the inner continental shelf of the Antarctic Peninsula. These and similar sites from around the Antarctic margin are a valuable resource when linked with ice cores and equivalent sections at lower latitude sites for studies of decadal and millenial-scale climate variation.
Year of Publication: 1998
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; ANTOSTRAT; Acoustical methods; Antarctic Ocean; Antarctica; Biogenic structures; Cenozoic; Climate; Climate change; Continental margin; Cores; Depositional environment; Geophysical methods; Geophysical surveys; Glacial extent; Glacial geology; Global; Holocene; Ice sheets; Leg 178; Marine sediments; Numerical models; Ocean Drilling Program; Palmer Deep; Quaternary; Sediment transport; Sedimentary structures; Sediments; Southern Ocean; Stratigraphy; Surveys; Volume
Coordinates: S673400 S634800 W0640000 W0783000
Record ID: 2000001773
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