东南极内陆格罗夫山地区基岩暴露年龄研究  

BEDROCK EXPOSURE AGES IN THE GROVE MOUNTAINS, INTERIOR EAST ANTARCTICA

作　　者：黄费新[1] 刘小汉[2] 孔屏[1] 琚宜太[1] 方爱民[1] 李潇丽[1] 那春光[1] 

机构地区：[1]中国科学院地质与地球物理研究所岩石圈构造演化开放实验室,北京100029 [2]中国科学院青藏高原研究所,北京100085

出　　处：《极地研究》2004年第1期22-28,共7页Chinese Journal of Polar Research

基　　金：国家"十五"社会公益研究专项资金项目 ( 2 0 0 1DIA5 0 0 40 )资助

摘　　要：采自东南极内陆格罗夫山地区两个冰原岛峰的五个基岩样品的原地生成宇宙成因核素1 0 Be和2 6Al测试结果表明 ,这五个样品的最小暴露年龄都在 2Ma左右 ,远远早于末次冰期极盛期 (LGM )。结合野外工作表明 ,格罗夫山地区中晚上新世以来至今冰盖厚度至少下降了 2 0 0m ,从那时起到现在 ,包括末次冰期极盛期 (LGM)在内 。Exposure ages of bedrock samples taken from two nunataks in the Grove Mountains (GMs), interior East Antarctica, are studied by dating in situ produced cosmogenic 10Be and 26Al. The results indicate that the minimum exposure time of the five samples are all about 2Ma, much older than that of Last Glacial Maximum. This as well as the field observations indicates that the thickness of the interior East Antarctic Ice Sheet (EAIS) had reduced more than 200m since early to middle Pliocene. From then on, even in the period of the Last Glacial Maximum (LGM), the elevation of the interior EAIS is never higher than that of early to middle Pliocene

关 键 词：东南极冰盖 格罗夫山 基岩 暴露年龄 

分 类 号：P588.12[天文地球—岩石学]