桂西地区二叠系合山组铝土岩的沉积环境<sup>*</sup>

doi:10.7605/gdlxb.2016.04.044

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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.

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Key words： western Guangxi Heshan Formation allite sedimentary environment paleosalinity

Received: 24 February 2016 Published: 01 August 2016

ZTFLH:	P588.24
	P611.2

About author: Zhang Qilian,born in 1966,senior engineer,is engaged in mineral exploration. E-mail:258839931@qq.com.

Cite this article:

. Sedimentary environment of allites in the Permian[J]. JOPC, 2016, 18(4): 595-604.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.04.044 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I4/595

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