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The controls of paleotemperature on potassium salt precipitation in ancient salt lakes

ZHAO YanJun;LIU ChengLin;ZHANG Hua;LI ZhaoQi;DING Ting;WANG MingQuan;MLR Key Laboratory of Metallogeny and MineralAssessment,Institute of Mineral Resources,CAGS;Reservoir Quality Prediction,ConocoPhillips Company;China University of Geosciences;  
Quantitative study on the controls of paleo-temperature on potassium salt precipitation in ancient lakes is key to understand potash formation. This paper measured the homogenization temperature of fluid inclusions within halite minerals from eight paleo-salt deposits,including the Ordovician Majiagou Formation in northern Shaanxi salt basin,the Triassic Jialingjiang Formation in Sichuan basin,the Cretaceous strata in both Lanping-Simao and Sakon Nakhon basins,etc. Homogenization temperature values were then used to calculate the evaporation rate of those marine saline lakes. Assume the evaporation rate of the Laos saline lake during the Cretaceous to be as standard 100,the evaporation rate of the northern Shaanxi salt basin,Sichuan basin,Lanping-Simao basin were54,68,and 90,respectively. In basins Laos and Yunnan with high evaporation rate,large quantities of potash salt mines have been discovered. Therefore,it can be concluded that high temperature( air temperature and water temperature) conditions are favorable for potassium salt precipitation in saline lakes,and high-temperature may serve as catalytic role for the precipitation of potassium out of saline lake waters.
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