大兴安岭满归地区变中酸性火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义

doi:10.19388/j.zgdzdc.2020.01.07

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Abstract Through the zircon U-Pb isotopes chronology research of the meta-intermediate-acidic volcanic rocks of Neoproterozoic-Lower Cambrian Dawangzi Formation in Mangui area of Da Hinggan Mountains, the authors explored the forming age and geological significance of the rocks. Dawangzi Formation is composed of meta-andesite, meta-dacite, rhyolite and a small amount of meta-crystalline tuff, and lacks interbeds of sedimentary rocks such as slate, metasandstone and schist. The authors determined the zircon U-Pb isotopes age of the meta-andesite, and the zircon ²⁰⁶Pb/²³⁸U weighted mean age is (199±1) Ma, indicating that the forming age of Dawangzi Formation meta-intermediate-acidic volcanic rocks is the early stage of Early Jurassic, not Neoproterozoic-Early Cambrian as in previous research. Early Jurassic volcanic rocks distributed in Erguna Block provide a provenance for Mohe Basin. Erguna Block was in the volcano-magmatic arc tectonic background in Early Jurassic. This research supplies new data for the geodynamics study during the closure of Mongolia-Okhotsk Ocean.

Key words： meta-intermediate-acidic volcanic rocks LA-ICP-MS zircon U-Pb age Early Jurassic Northern Da Hinggan Mountains

Received: 24 December 2018

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	LI Zhonghui
	LI Ruijie
	LI Yang
	SHA Huanyu

Cite this article:

LI Zhonghui,LI Ruijie,LI Yang, et al. LA-ICP-MS zircon U-Pb ages and geological significance of the meta-intermediate-acidic volcanic rocks in Mangui area of Da Hinggan Mountains[J]. , 2020, 7(1): 47-52.

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http://www.zgdzdcbjb.com/EN/10.19388/j.zgdzdc.2020.01.07 OR http://www.zgdzdcbjb.com/EN/Y2020/V7/I1/47

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