期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 216, 期 1-2, 页码 93-107出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0012-821X(03)00509-0
关键词
West Antarctic Ice Sheet; East Antarctic Ice Sheet; middle Miocene shift; seismic stratigraphy
Seismic correlation of glacial unconfortnities from the Ross Sea outer continental shelf to chronostratigraphic control at DSDP sites 272 and 273 indicates that at least two West Antarctic Ice Sheet (WAIS) expansions occurred during the early part of the middle Miocene (i.e. well before completion of continental-scale expansion of the East Antarctic Ice Sheet (EAIS) inferred from delta(18)O and eustatic shifts). Therefore, if the volume of the EAIS was indeed relatively low. and if the Ross Sea age model is valid, then these WAIS expansions/contractions were not a direct consequence of EAIS expansion over the Transantarctic Mountains onto West Antarctica. An in-situ development of the WAIS during the middle Miocene suggests that either West Antarctic land elevations were above sea level and/or that air and water temperatures were sufficiently cold to support a marine-based ice sheet. Additional chronostratigraphic and lithologic data are needed from Antarctic margins to test these speculations. (C) 2003 Elsevier B.V. All rights reserved.
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