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Tectonic and Environmental Evolution of Gyirong Basin,and its Relationship to the Uplift of Tibetan Plateau

WANG Dechao,ZHANG Jinjiang,YANG Xiongying,QI GuoweiThe Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871;  
The Gyirong faulted basin,located in the northern slope of Himalayas, received over 300?m thick sediments of lacustrine and fluvial facies scince late Miocene to early Pleistocene.Based on the analyses of the sedimentology,carbon-oxygen isotope and basin-controlling structures,integrated with previous studies of paleontology and palynology,this paper gave reconstructions on the controlling structures,sedimentary environment,climate changes and the evolutionary processes of this basin in the late Cenozoic.The coupling relationship between tectonic evolution and climate changes was also discussed.This study shows that the Gyirong basin underwent a evolution successively from a half-closed faulted lake basin in the early stage,to an open lake basin in the middle stage,and to a closed lake basin in the final stage.
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