10Be in quartz gravel from the Gobi Desert and evolutionary history of alluvial sedimentation in the Ejina Basin,Inner Mongolia,China

作     者：ALDAHAN Ala POSSNERT Gran 

作者机构：Department of Earth SciencesUppsala University Tandem LaboratoryUppsala University 

出 版 物：《Science Bulletin》 (科学通报(英文版))

年 卷 期：2010年第55卷第33期

页      面：3806-3813页

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(KZCX2-YW-117) the National Natural Science Foundation of China(40841022 and 40373046) 

主　　题：10Be Gobi Desert alluvial fan Ejina Basin tectonic activity climate 

摘      要：Reconstructing the evolutionary history of the Gobi deserts developed from alluvial sediments in arid regions has great significance in unraveling changes in both tectonic activity and ***,such work is limited by a lack of suitable dating material preserved in the Gobi Desert,but cosmogenic 10Be has great potential to date the Gobi *** the present study,10Be in quartz gravel from the Gobi deserts of the Ejina Basin in Inner Mongolia of China has been measured to assess exposure *** show that the Gobi Desert in the northern margin of the basin developed 420 ka ago,whereas the Gobi Desert that developed from alluvial plains in the Heihe River drainage basin came about during the last 190 *** latter developed gradually northward and eastward to modern terminal lakes of the *** temporal and spatial variations in the Gobi deserts are a consequence of alluvial processes influenced by Tibetan Plateau uplift and tectonic activities within the Ejina *** episodes of Gobi Desert development within the last 420 ka indicate that the advance/retreat of alpine glaciers during glacial/interglacial cycles might have been the dominant factor to influencing the alluvial intensity and water volume in the *** floods and large water volumes would mainly occur during the short deglacial periods.