Petrogenesis and Tectonic Setting of The Early Jurassic Granitic Plutons in South China: A Discussion on Mineralization of Critical Metals
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摘要: 华南早侏罗世花岗岩及其形成的构造背景是备受地质学者关注的焦点问题之一。本文在系统收集华南地区早侏罗世花岗质侵入岩的时空分布、岩体地质和地球化学特征等资料的基础上，探讨它们的岩石成因及幔源基性岩浆在花岗质岩浆形成过程中的贡献。结果显示，华南早侏罗世花岗质侵入岩总体上呈面状展布，在赣南-粤北地区相对密集，其形成时代主要集中于185~190 Ma。华南早侏罗世花岗岩以A型花岗岩为主，幔源物质贡献明显，其形成于印支造山运动晚阶段的后造山伸展环境。简要概述了华南与早侏罗世侵入岩有关的铀矿、铁锡矿及REE-Nb-Ta矿等关键金属成矿作用。Abstract: One of the focuses concerned by geologists is the Early Jurassic granites in South China and their tectonic setting. On basis of systematically collecting the data of spatiotemporal distribution, geological characteristics and geochemical compositions of the Early Jurassic granitic intrusive rocks in South China, we discuss the petrogenesis of these granites, and the contribution of mantle-derived mafic magma in the formation of granitic magma. The results indicate that the Early Jurassic granitic intrusive rocks are generally distributed in a plane shape, and are relatively dense in southern Jiangxi and northern Guangdong, with the mainly formation ages of 185~190 Ma. The granites in South China are dominated by A-type granites, with obvious contributions from mantle-derived materials. They were formed in the post-orogenic extensional environment of the late stage of Indosinian orogeny. Finally, we briefly summarize the mineralization of critical metals, such as uranium, iron-tin and REE-Nb-Ta, related to the intrusive rocks.
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Key words:
- Early Jurassic /
- granite /
- petrogenesis /
- tectonic setting /
- critical metals /
- South China
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