Preliminary study on the erratic exposure ages of Grove Mountains, East Antarctica

ADVANCES IN POLAR SCIENCE ›› 2009, Vol. 20 ›› Issue (1-English): 15-21.

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Preliminary study on the erratic exposure ages of Grove Mountains, East Antarctica

Li Guangwei^1,2, Liu Xiaohan¹, Huang Feixin¹, Kong Ping³, Fink David⁴, Wei Lijie¹and Fang Aimin⁵

1 Institute of Tibetan Plateau Research, Chinese Academ y of Sciences, Beijing 100085, China;
2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
3 Institute of Geology and geophysics, Chinese Academy of Sciences, Beijing 100029, China;
4 Australian Nuclear Science and Technology Organization, Menai, NSW 2234, Australia;
5 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Online:1959-03-30 Published:1959-03-30
Contact: Li Guangwei

Abstract

Abstract:

The first study of erratic boulder exposure ages in the Grove Mountains, interior Antarctica, indicates the two erratic boulders (06013121 and 06013122, collected from a typical nunataks, Zakhar off Ridge in the Grove Mountains) have ¹⁰Be minimum exposure ages of 1.24 ±0.11 Ma, 1.37 ±0.12 Ma, and ²⁶Al ages of 0.90 ±0. 2Ma, 0.44 ±0.04 Ma, respectively. Meanwhile, another erratic boulder sample 06013124, coming from vicinal ice surface, has ¹⁰Be and ²⁶Al minimum exposure ages of 0.47±0.3Ma and 0.44±0.04Ma, respectively. The exposure ages of the three erratic boulders are nearly similar to the bedrockswith the similar elevation. Thus, using the technique of in situ produced terrestrial cosmogenic nuclides, the ice sheet evolution histories in the Grove Mountains reflected by erratic boulder and bedrock exposure ages are basically consistent.

Key words: East Antarctica, Grove Mountains, Zakharoff Ridge, ¹⁰Be and ²⁶Al exposure age, erratic boulders

Li Guangwei, Liu Xiaohan, Huang Feixin, Kong Ping, Fink David, Wei Lijie, Fang Aimin. Preliminary study on the erratic exposure ages of Grove Mountains, East Antarctica[J]. ADVANCES IN POLAR SCIENCE, 2009, 20(1-English): 15-21.

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Preliminary study on the erratic exposure ages of Grove Mountains, East Antarctica

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