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《Journal of Palaeogeography》 2009-01
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Sedimentary characteristics of the Miocene Wudaoliang Formation in Tuotuohe Basin of Qinghai-Tibet Plateau and palaeoenvironment analysis

Sun Xia Yi HaishengInstitute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan  
Analyses have been carried out on the lacustrine setting of the Wudaoliang Formation in the Tuotuohe Basin of Qinghai-Tibet Plateau.The study focuses on information of climate changes reflected by the sedimentary stratigraphic records and investigates the palaeoenvironmemt changes in the plateau in the Miocene.Rock types and sedimentary characteristics of the Wudaoliang Formation were analyzed and flood plain,shallow lacustrine,shore lacustrine and salt lake sedimentary facies were recognized.With reference to the present lacustrine features and the study examples of ancient lakes,the sedimentary origins of the lacustrine carbonates in the study area were discussed.The facies markers in the section and the stratigraphic stacking patterns indicate that the palaeolake experienced three cycles of low lake level to high lake level changes during the deposition of the Wudaoliang Formation.The minimum lake level is marked by the occurrence of the gypsum interval,while the high lake level period is characterized by the deposition of flooding mudstones.The results indicate that the depositional setting of the Wudaoliang Formation was dominated by a dry-wet climate alternation,lake level change and the fluctuation is mainly influenced by climate with structural subsidence and fault block uplifting as the secondary controlling factors.
【Fund】: 国家自然科学基金(编号:40572077);; 博士学科点专项科研基金(编号:20060616005)资助
【CateGory Index】: P512.2
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