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

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

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

【作者】 李广伟; 刘小汉; 黄费新; 孔屏; 韦利杰; 方爱民; Fink David

【Author】 Li Guangwei ; Liu Xiaohan ; Huang Feixin ; Kong Ping ; Wei Lijie ; Fang Aimin ; Fink David

【期刊】极地研究

【Journal】

【期刊年份】2009

【卷】20

【期】1

【关键词】 East Antarctica; Grove Mountains; Zakharoff Ridge; 10 Be and 26 Al exposure age; erratic boulders

【Keywords】 East Antarctica; Grove Mountains; Zakharoff Ridge; 10 Be and 26 Al exposure age; erratic boulders

【摘要】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 10 Be minimum exposure ages of 1.24 ±0.11 Ma, 1.37 ±0.12 Ma, and 26 Al ages of 0.90 ±0. 2Ma, 0.44 ±0.04 Ma, respectively. Meanwhile, another erratic boulder sample 06013124, coming from vicinal ice surface, has 10 Be and 26 Al 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.

【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 10 Be minimum exposure ages of 1.24 ±0.11 Ma, 1.37 ±0.12 Ma, and 26 Al ages of 0.90 ±0. 2Ma, 0.44 ±0.04 Ma, respectively. Meanwhile, another erratic boulder sample 06013124, coming from vicinal ice surface, has 10 Be and 26 Al 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.

【基金/项目】 上新世以来东南极冰盖进退历史及其与气候变化的关系研究 ; 东南极内陆格罗夫山基岩暴露年龄研究 ; 东南极格罗夫山陨石富集冰碛带暴露年龄研究

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