Oligocene development of the west antarctic ice sheet recorded in eastern ross sea strata

被引：28

作者：

Sorlien, Christopher C.

Luyendyk, Bruce P.

Wilson, Douglas S.

Decesari, Robert C. ^{[1
]}

Bartek, Louis R.

Diebold, John B.

机构：

[1] Univ Calif Santa Barbara, Inst Crustal Studies, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA

[3] Univ N Carolina, Dept Geol Sci, Chapel Hill, NC 27599 USA

[4] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

来源：

GEOLOGY | 2007年 / 35卷 / 05期

关键词：

antarctic ice sheet; Marie byrd land; west antarctica; seismic; stratigraphy; ross sea; oligocene; basins;

D O I：

10.1130/G23387A.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Seismic-reflection data from the easternmost Ross Sea image buried scour-and-fill troughs and flat-topped ridges interpreted as having formed by glacial erosion and deposition during the Oligocene. The NNW-SSE orientation of the troughs and lack of similar Oligocene glacial features within the central Ross Sea suggests that the ice issued from the highlands of Marie Byrd Land located 100 km away and that portions of the West Antarctic Ice Sheet formed earlier than previously accepted. Existing global climate models (GCMs) do not produce West Antarctic ice caps for the Oligocene, in part due to low elevations modeled for that time. Evidence for Oligocene ice beyond the paleocoast suggests a higher elevation for the early Cenozoic Marie Byrd Land and Ross Embayment than at present.

引用

页码：467 / 470

页数：4

共 17 条

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