额尔古纳地块中生代火成岩的年代学与地球化学:对蒙古—鄂霍茨克缝合带构造演化的制约

发布时间：2018-04-09 11:33

  本文选题：额尔古纳地块　切入点：中生代　出处：《吉林大学》2016年博士论文

【摘要】：本文以额尔古纳地块上中生代侵入岩为研究对象,通过锆石LA-ICP-MS和SIMS U-Pb定年、榍石LA-ICP-MS U-Pb定年、普通角闪石和黑云母40Ar-39Ar定年,将额尔古纳地块上岩浆作用划分为七期,变形作用划分为两期。基于全岩主、微量元素及锆石Hf同位素分析,确定了各期次火成岩的岩浆演化过程及岩浆源区性质。通过对火成岩的岩石组合、时空分布、地球化学特征、岩石成因及区域构造事件的综合研究,本文揭示了中生代期间蒙古-鄂霍茨克大洋板块向南俯冲作用过程及大洋闭合后的构造演化历史,限定了蒙古-鄂霍茨克构造体系在我国境内影响的时空范围及其对成矿作用的制约。
[Abstract]:In this paper, the Mesozoic intrusive rocks in the Erguna massif are studied. The magmatism in the Erguna massif is divided into seven periods by zircon LA-ICP-MS and SIMS U-Pb dating, sphene LA-ICP-MS U-Pb dating, ordinary hornblende and biotite 40Ar-39Ar dating.The deformation is divided into two phases.Based on the isotopic analysis of the main elements, trace elements and zircon HF of the whole rock, the magmatic evolution process and magmatic origin of each stage of igneous rocks are determined.Through a comprehensive study of the rock assemblages, space-time distribution, geochemical characteristics, petrogenesis and regional tectonic events of igneous rocks,This paper reveals the subduction process of the Mongolian-Okhotsk oceanic plate towards the south during the Mesozoic and the tectonic evolution after the closure of the ocean.The influence of Mongol-Okhotsk tectonic system in China is limited in time and space and its influence on mineralization is restricted.
【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P597.3;P588.1
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本文编号：1726244