Depositional Environment in Late Carboniferous-Early Permian in Southern Hetian Area of Southwest Tarim Basin．

： Depositional environment study has been conducted based on comprehensive analysis for each formation of Late Carboniferous－Early Permian in southern Hetian area of southwest Tarim basin， including their lithology， sedimentary structure， paleobiology， element geochemistry and other sedimentary facies markers． The Late Carboniferous－Early Permian may be divided into two depositional periods， namely， the early subperiod and late subperiod， with their related sedimentary patterns． Then， on such basis， the evolutionary history of Carboniferous-Permian sediments in that area has been analyzed．