LA-ICP-MS zircon U-Pb ages and geological significance of the meta-intermediate-acidic volcanic rocks in Mangui area of Da Hinggan Mountains
LI Zhonghui1, LI Ruijie1, LI Yang2, SHA Huanyu1
1. Heilongjiang Institute of Geological Survey, Harbin 150036, China; 2. Heilongjiang Qiqihar Institute of Geological Exploration, Qiqihar 161006, China
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.
李中会, 李睿杰, 李阳, 沙环宇. 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[J]. 中国地质调查, 2020, 7(1): 47-52.
LI Zhonghui, LI Ruijie, LI Yang, SHA Huanyu. LA-ICP-MS zircon U-Pb ages and geological significance of the meta-intermediate-acidic volcanic rocks in Mangui area of Da Hinggan Mountains. , 2020, 7(1): 47-52.
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2020, Vol. 7 
