Late Miocene ice sheet elevation in the Grove Mountains, East Antarctica, inferred from cosmogenic 21Ne-10Be-26Al

被引：12
作者：
Kong, Ping [1 ,2 ]
Huang, Feixin [3 ]
Liu, Xiaohan [2 ]
Fink, David [4 ]
Ding, Lin [2 ]
Lai, Qingzhou [2 ]
机构：
[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earths Deep Interior, Beijing 100029, Peoples R China
[2] Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
[3] China Met Geol Bur, Inst Mineral Resources Res, Beijing 100025, Peoples R China
[4] Australian Nucl Sci & Technol Org, Inst Environm Res, Menai, NSW 2234, Australia
来源：
GLOBAL AND PLANETARY CHANGE | 2010年 / 72卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
exposure age; cosmogenic nuclide; Grove Mountains; Antarctica; Late Miocene; NUCLIDE APPROACH; SOUTHERN-OCEAN; HALF-LIFE; BE-10; EROSION; AL-26; AGE; PLIOCENE; HISTORY; GLACIATION;
D O I：
10.1016/j.gloplacha.2010.03.005
中图分类号：
P9 [自然地理学];
学科分类号：
0705 ; 070501 ;
摘要：
The Grove Mountains, lying in the interior of East Antarctica, consist of 64 nunataks. Geomorphic characteristics of the nunataks suggest that past ice sheet elevations have overtopped the summits of the Grove Mountains. Cosmogenic Ne-21, Be-10 and Al-26 dating yields surface exposure ages of five bedrock samples taken from the crest of Mount Harding, a typical nunatak in the Grove Mountains. Using multi-nuclide fitting, we have calculated the time that the ice sheet retreated below the crest of Mount Harding; all data point to the late Miocene, similar to 6.3 Ma ago. The results provide the first land-based evidence of the elevation of the East Antarctic Ice Sheet in the Grove Mountains in Late Miocene, which reached 2300 m, 200 m higher than the current ice sheet level. The higher than current ice sheet elevations during the late Miocene together with contemporaneously higher temperatures in the Southern Ocean suggest that moisture transport plays an important role in ice sheet expansion in the interior of East Antarctica. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：50 / 54
页数：5
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