Cosmogenic ^(10)Be dating of Guxiang and Baiyu Glaciations  

作　　者：ZHOU ShangZhe XU LiuBing PATRICK M. Colgan DAVID M. Mickelson WANG XiaoLi WANG Jie ZHONG Wei 

机构地区：[1]Department of Geography, South China Normal University, Guangzhou 510631, China [2]Department of Geology, Grand Valley State University, Allendale, Michigan 49401, USA [3]Department of Geology and Geophysics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA [4]Department of Geography, Lanzhou University, Lanzhou 730000, China

出　　处：《Chinese Science Bulletin》2007年第10期1387-1393,共7页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 40371013 and 40601012);NSF/EAR-0345277

摘　　要：Guxiang and Baiyu Glaciations are two previously recognized local glaciations of the Tibetan Plateau. They have been widely used as the reference standard for classifying Late Quaternary glaciations on the Tibetan Plateau and its surrounding mountains. However, the numerical chronologies of both glaciations have been lacking. In this study, cosmogenic 10Be dating was undertaken to define the timing of these two glaciations. The surface boulders deposited by the glaciers of the Guxiang and Baiyu Glaciations have exposure ages of 112.9±16.7―136.5±15.8 ka BP and 11.1±1.9―18.5±2.2 ka BP, respectively. It is likely that the Guxiang and Baiyu Glaciations correspond to marine isotope stages 6 and 2, respectively.Guxiang and Baiyu Glaciations are two previously recognized local glaciations of the Tibetan Plateau. They have been widely used as the reference standard for classifying Late Quaternary glaciations on the Tibetan Plateau and its surrounding mountains. However, the numerical chronologies of both glaciations have been lacking. In this study, cosmogenic They dating was undertaken to define the timing of these two glaciations. The surface boulders deposited by the glaciers of the Guxiang and Baiyu Glaciations have exposure ages of 112.9±16.7-136.5±15.8 ka BP and 11.1±1.9-18.5±2.2 ka BP, respectively. It is likely that the Guxiang and Baiyu Glaciations correspond to marine isotope stages 6 and 2, respectively.

关 键 词：宇宙核素 铍10 测年 冰川作用 青藏高原 

分 类 号：P343.63[天文地球—水文科学]