Publication: Advances in Polar Science (APS). Antarctic Research, Vol. 20, No. 1, 15~21, June 2009
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Author: Li Guangwei, Liu Xiaohan, Huang Feixin, Kong Ping, Fink David, Wei Lijie and Fang Aimin
CNARC member: Polar Research Institute of China (PRIC)
Abstract: The first study of erratic boulder exposure ages in the Grove Mountains, interior Antarctica, indicates the two erratic boulders (060131-1 and 060131-2, collected from a typical nunataks, Zakharoff Ridge in the Grove Mountains) have 10 Be minimum exposure ages of 1. 24 ±0. 11 Ma, 1. 37 ±0. 12 Ma, and 26 Al ages of 0. 90 ±0. 12Ma, 0. 44 ±0. 04 Ma, respectively. Meanwhile, another erratic boulder sample 060131-4, coming from vicinal ice surface, has 10Be and 26Alminimum 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 GroveMountains reflected by erratic boulder and bedrock exposure ages are basically consistent.
Key words: East Antarctica, Grove Mountains, Zakharoff Ridge, 10 Be, 26 Al, exposure age, erratic boulders
