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Preliminary study on the erratic exposure ages of Grove Mountains, East Antarctica |
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| Authors: | Li Guangwei Liu Xiaohan Huang Feixin Kong Ping Fink David Wei Lijie Fang Aimin |
| Affiliation: | 1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;Graduate University of the Chinese Academy of Sciences,Beijing 100049, China 2. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, 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 |
| 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 10Be minimum exposure ages of 1.24±0.11 Ma, 1.37±0.12 Ma, and 26Al ages of 0.90±0.12 Ma,0.44±0.04 Ma, respectively. Meanwhile, another erratic boulder sample 060131-4, coming from vicinal ice surface, has 10Be and 26Al minimum exposure ages of 0.47±0.3 Ma and 0.44±0.04 Ma, respectively. The exposure ages of the three erratic boulders are nearly similar to the bedrocks with 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. |
| Keywords: | East Antarctica Grove Mountains Zakharoff Ridge 10Be and 26Al exposure age erratic boulders |
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