Age determinations of the Quaternary strata and environmental changes in the Alag Lake area,East Kunlun

The detailed genetic classification and age determinations of the Quaternary strata in the Alag Lake area,East Kunlun are made on the basis of sediment analysis and ESR,OSL and ¹⁴C dating.The results of research in this study have provided important basis for the further approaches to the major tectonic events of the Qinghai-Xizang Plateau uplifting and resultant environmental changes since the Quaternary.The Quaternary environmental changes are discussed in the light of sediments and sporopollens in the Quaternary strata.The occurrence of the subfrigid coniferous forests in the early Pleistocene lacustrine strata and overlying of the middle Pleistocene glacial deposits upon the early Pleistocene lacustrine strata may be interpreted as important marks indicating environmental changes in the Quaternary,when the basinrange coupling is apparent,and mountainrange uplifting and sedimentary basins tend to be migrated from north to south.