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

• 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

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.