Abstract：There exists a controversy about the sedimentary environment of the allites in the Permian Heshan Formation in western Guangxi: Land environment or marine environment? Based on the field investigation and geochemical data of samples from the Permian allites, we believed that the Permian allites in western Guangxi were deposited in the land environment. That the allites distributed continuously and widely on the isolated carbonate platforms in the Permian in western Guangxi indicated that the bausite ore beds were formed in an exposed carbonate platform environment. According to the contact between the allites and the carbonate substratum of the Maokou Formation, there existed carbonate gravels in the bottom of allites formation, and it could be seen that the allites filled the carbonate substratum in some sections, and this indicated that the bauxitization occured directly on the ancient karst surface. Additionally, the acient plant fossils in the bauxite ore beds also revealed the allites were formed in land environment. Combined with the V/Zr-Zr/Cu discriminant plot, the geochemical data of the allite samples, Boron contents lower than 10×10-6, Sr/Ba range of 0.291.61 with the mean of 0.92, Rb/K range of 0.00110.0025 with the mean of 0.0017, indicated that the allites in the Permian Heshan Formation in western Guangxi were formed in the land freshwater environment.
基金资助:中国地质调查局计划项目“南岭成矿带地质矿产调查”子项目“桂西整装勘查区铝土矿床成因与富集规律研究”(编号:12120113064200); [Financially supported by the subproject of China Geological Survey(CGS)“Geological and mineral resources suvery of Nanling Metallogenic Belt”-“Formation and enrichment regularities of bauxite deposit in integrated exploration area of West Guangxi”(No.12120113064200)]
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