江南造山带的形成与演化

发布时间：2018-04-05 04:18

本文选题：江南造山带　切入点：新元古代　出处：《矿物岩石地球化学通报》2017年05期

【摘要】：处于扬子地块和华夏地块之间的江南造山带是理解华南地壳演化、岩浆过程和成矿效应的关键。近年来,围绕江南造山带的构造-岩浆演化产生了较大争论,因而影响到对华南显生宙岩浆-成矿事件内在联系及动力学机制的认识。本文总结了近年来对江南造山带研究大量资料,对有关江南造山带形成和演化的几个方面进行了剖析和讨论,明确了江南造山带是一个稍晚于世界典型Grenville期造山事件的新元古代的造山带,具有完整的蛇绿岩、岛弧火山岩、高压变质岩、同碰撞岩浆岩、造山磨拉石、碰撞后岩浆岩和造山后岩浆岩等与造山过程相吻合的岩石组合,经历了从洋洋俯冲、弧-陆碰撞到洋-陆俯冲、弧后盆地打开再到造山后伸展的构造过程,在华南中部形成了大量中元古代末到新元古代早期的新生地壳,很可能是显生宙成岩-成矿作用的重要物源。
[Abstract]:The Jiangnan orogenic belt between the Yangtze block and the Huaxia block is the key to understanding the crustal evolution, magmatic process and metallogenic effect in South China.In recent years, there has been a great controversy over the evolution of tectonic-magma in the Jiangnan orogenic belt, which has affected the understanding of the internal relationship and dynamic mechanism of the Phanerozoic magmatic and metallogenic events in South China.This paper summarizes a great deal of data on the study of Jiangnan orogenic belt in recent years, and analyses and discusses several aspects of formation and evolution of Jiangnan orogenic belt.It is clear that the Jiangnan orogenic belt is a Neoproterozoic orogenic belt slightly later than the typical Grenville orogenic events in the world, with complete ophiolites, island arc volcanic rocks, high-pressure metamorphic rocks, collisional magmatic rocks and orogenic molars.The assemblages of post-collision magmatic rocks and post-orogenic magmatic rocks, which are consistent with the orogenic process, have undergone a tectonic process from ocean subduction, arc-land collision to ocean-land subduction, back-arc basin opening to post-orogenic extension.A large number of new crust from late Mesoproterozoic to early Neoproterozoic were formed in the central part of South China, which may be an important provenance of Phanerozoic diagenesis and mineralization.
【作者单位】：内生金属矿床成矿机制研究国家重点实验室南京大学地球科学与工程学院;
【基金】：国家自然科学基金项目(41330208,41222016)
【分类号】：P542.2

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