The Research of Ancient Environment of Rock Geochemistry and Sequence Stratigraphy on Saline Lake, Qingjiang Depression

The saline lake as the special unit of terrestrial lake is formed under the special geology and climate. The huge thickness of rhythmic saline sediment which was developed in the Qianjiang Formation of Qianjiang Depression may be a representative example for the study of sequence stratigraphy about saline lake. The paper uses the rationale of sequence stratigraphy, carving up sequence of Qianjiang saline lake, and discusses the characteristics of the sequence stratigraphy development. By means of the rock geochemistry, the paper analyzes the changing character of different sequences and tracts and discusses the environment significance of B、Sr、Ba、V、Ni etc. microelements and their ratios and C、O、S etc. isotopes which are very sensitive to sedimentary environment. Finally, the paper draws a conclusion that the sedimentary environment of the saline lake basin of Qianjiang is a terrestrial lake with the higher salinity.