本文選題：額爾古納地塊　切入點(diǎn)：中生代　出處：《吉林大學(xué)》2016年博士論文

【摘要】：本文以額爾古納地塊上中生代侵入巖為研究對象,通過鋯石LA-ICP-MS和SIMS U-Pb定年、榍石LA-ICP-MS U-Pb定年、普通角閃石和黑云母40Ar-39Ar定年,將額爾古納地塊上巖漿作用劃分為七期,變形作用劃分為兩期�；谌珟r主、微量元素及鋯石Hf同位素分析,確定了各期次火成巖的巖漿演化過程及巖漿源區(qū)性質(zhì)。通過對火成巖的巖石組合、時(shí)空分布、地球化學(xué)特征、巖石成因及區(qū)域構(gòu)造事件的綜合研究,本文揭示了中生代期間蒙古-鄂霍茨克大洋板塊向南俯沖作用過程及大洋閉合后的構(gòu)造演化歷史,限定了蒙古-鄂霍茨克構(gòu)造體系在我國境內(nèi)影響的時(shí)空范圍及其對成礦作用的制約。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P597.3;P588.1
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本文編號：1726244