川西卡拉地区晚古生代硅质岩成因及沉积环境

doi:10.19388/j.zgdzdc.2020.06.09

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Abstract In order to study the sedimentary environment characteristics of the Late Paleozoic in Kala area of Western Sichuan Province, the authors have conducted the petrological and geochemical analyses of the widely distributed silicate in Qiongyi Formation of Lower Carboniferous and Kawenggou Formation of Upper Permian. The results show that the silicate in the study area belongs to the pure siliceous rocks, with a continuous supply of land-based materials during the deposition process. The average Al/(Al+Fe+Mn) ratio is 0.62, and the silicate shows a biogenic origin by the Al-Fe-Mn diagram. The ratios of Al₂O₃/ (Al₂O₃+ Fe₂O₃), Th/U, Th/Sc, (La/Ce)_N and (La/Yb)_N and tectonic environment discriminant diagram demonstrate that the silicate developed in a shallow-slope depesitional environment in the continental margin. The Ce_anom value is -0.04 to 0.07, and it gradually increases from the Carboniferous to the Permian period, indicating the water body is in an anoxic environment with gradually increasing reducibility. The Garz--Litang basin opened in the Carboniferous period, in accordance with the regional geological evolution, and it continued to expand during the Permian period, with the gradually increasing depth of the seawater within the sedimentary basins.

Key words： Kala area of Western Sichuan Province silicate origin sedimentary environment

Received: 04 December 2019

P588.244

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	Articles by authors
	LIU Daming
	YAO Hongyou
	HU Lin
	YU Liang
	LIU Yizhong

Cite this article:

LIU Daming,YAO Hongyou,HU Lin, et al. Petrogenesis and sedimentary environment of silicate in Late Paleozoic in Kala area of Western Sichuan Province[J]. , 2020, 7(6): 68-78.

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http://journal25.magtechjournal.com/Jwk_dzdc/EN/10.19388/j.zgdzdc.2020.06.09 OR http://journal25.magtechjournal.com/Jwk_dzdc/EN/Y2020/V7/I6/68

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