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

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, Zakharoff Ridge in the Grove Mountains) have 10 Be minimum exposure ages of 1.24 ± 0. 11 Ma, 1.37 ± 0.12 Ma, and...

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Bibliographic Details
Main Authors: Guangwei, Li, Xiaohan, Liu, Feixin, Huang, Ping, Kong, David, Fink, Lijie, Wei, Aimin, Fang
Format: Article in Journal/Newspaper
Language:English
Published: Polar Research Institute of China - PRIC 2009
Subjects:
Terrestrial
East Antarctica
Grove Mountains
Zakharoff Ridge
Advances in Polar Science
Antarc*
Antarctica
Ice Sheet
Polar Science
Online Access:http://library.arcticportal.org/2368/
http://library.arcticportal.org/2368/1/A0090102.pdf
Description
Summary: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, 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 ± 0.12 Ma, 0.44 ± 0.04 Ma, respectively. Meanwhile, another erratic boulder sample 060131-4, coming from vicinal ice surface, has 10 Be and 26 Aluminum 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.

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