This study was supported by the National Natural Science Foundation of China (Grant No.41902065, 41772197), Open Reserch Fund from the State Key Laboratory Breeding base of Nuclear Resources and environment (Grant NRE1803), the Chongqing Science and Technology Innovation Project (Zhu Zhengjie), the Major State Basic Research Development Program (No.2011CB40300). Professor Jun Tang, Yongfei Zheng from the University of Science and Technology of China, Professor Randy Stoler from the University of Kansas gave a great help in manuscript writing process. Professor Tim. K. Lowenstein from Binghamton University and Robert Goldstein from Kansa University give some advices on finding the fluid inclusion types.
Sichuan Basin is one of the most important marine–salt forming basins in China. The Simian and Triassic have a large number of evaporites. The Triassic strata have found a large amount of polyhalite and potassium-rich brine. However, no soluble potassium salt deposit were found. In this study, the halite in well Changping 3 which is located at the eastern part of the Sichuan basin was studied using the characteristics, hydrogen and oxygen isotopes of the fluid inclusion in halite to reconstruct the paleoenvironment. The salt rocks in well Changping 3 can be divided into two types: grey salt rock and orange salt rock. The result shows that the isotopic composition of the halite fluid inclusion is distinct from the global precipitation line reflecting that the salt formation process is under strong evaporation conditions and the climate is extremely dry. At the same time, compared with the hydrogen and oxygen isotopes of brine in the Sichuan Basin and the hydrous isotope composition of the inclusions in the salt inclusions of other areas in China, it is shown that the evaporation depth of the ancient seawater in the Sichuan Basin was high and reached the precipitation of potassium and magnesium stage.
DING Ting, LIU Chenglin, GUO Fusheng, ZHAO Yanjun, WANG Mingquan, CHEN Liuqin.2020. Evaporation Stage of Paleo-saline Lake in the Sichuan Basin, China: Insight from Fluid inclusions in Halite[J]. ACTA GEOLOGICA SINICA(English edition),94(3):801~808
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