大兴安岭中段索伦地区中侏罗统万宝组沉积环境及地球化学特征

doi:10.13686/j.cnki.dzyzy.2022.05.001

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Abstract To further research the tectonic settings of Mesozoic fault basin in Daxinganling Mountains, on the basis of field geological survey and petrogeochemical analysis, this paper systematically studies the sedimentary environment and geochemical properties of Middle Jurassic Wanbao Formation in Suolun area. The results indicate that Wanbao Formation is a set of continental sedimentary clastic rocks distributed in the intermountain fault basin, with the sedimentary environment of braided river delta facies. The Wanbao Formation is geochemically characterized by enrichment of LILEs (Th, U, LREE), Zr and Hf, and depletion of HFSEs (Nb, Ta, P, Ti), as well as Ba and Sr. The REE patterns reveal right-dipping LREE enrichment. The sediment provenance mainly comes from acid-intermediate magmatic rocks, with the characteristics of continental island arc tectonic setting, which may be related to the southward subduction and back-arc extension of Mongolia-Okhotsk Ocean.

Key words： Wanbao Formation sedimentary environment provenance analysis tectonic setting middle Daxinganling Mountains Songliao Basin

Received: 27 January 2021

PACS:	P595
	P544

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	SHI Lu
	TANG Zhen
	ZHANG Yu-jin
	YANG Liu
	DU Yu-chun

Cite this article:

SHI Lu,TANG Zhen,ZHANG Yu-jin等. SEDIMENTARY ENVIRONMENT AND GEOCHEMISTRY OF THE MIDDLE JURASSIC WANBAO FORMATION IN SUOLUN AREA, MIDDLE DAXINGANLING MOUNTAINS[J]. GEOLOGY AND RESOURCES, 2022, 31(5): 579-587.

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http://manu25.magtech.com.cn/Jweb_dzyzy/EN/10.13686/j.cnki.dzyzy.2022.05.001 OR http://manu25.magtech.com.cn/Jweb_dzyzy/EN/Y2022/V31/I5/579

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