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| Citation: | Tang Qiliang, Zhang Xiying, Miao Weiliang, Li Yongshou, Li Wenxia, Zhao Xue, 2022. Depositional Environment during Late Salt-Forming Period in Potash Deposits of Vientiane Basin, Laos: Evidence from Borate Minerals. Earth Science, 47(1): 149-158. doi: 10.3799/dqkx.2021.066
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There exist abundant potassium resources in Vientiane Basin of Laos. These huge evaporites or potash deposits are important materials for studying formation and evolution of ancient evaporites and seawater. The salt-bearing construction of the Vientiane Basin in Laos contains three evaporite-clastic sedimentary rhythms, while the potassium-magnesium salt deposits are present at the top of the lower salt section. Through the extraction of borate minerals from the potassium-magnesium salt deposits in the Thongmang potash mine in Laos, it is found that there are two forms of borate minerals in the late stage of potassium formation, namely boracite single crystal and oolitic boracite. According to the analysis, the content of boracite single crystal in the borehole is less; while the oolitic boracite is more distributed and basically present on the top of the potassium-magnesium salt layer, and the regular distribution of oolitic boracite shows that the sedimentary environment is a turbulent shallow water environment. Both the boracite single crystal and oolitic boracite are formed in a high-energy environment, and the oolitic boracite is of great significance to invert the salt-forming environment.
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