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首页> 外文期刊>Journal of Asian earth sciences >Zircon U-Pb geochronology of the Mesozoic metamorphic rocks and granitoids in the coastal tectonic zone of SE China: Constraints on the timing of Late Mesozoic orogeny
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Zircon U-Pb geochronology of the Mesozoic metamorphic rocks and granitoids in the coastal tectonic zone of SE China: Constraints on the timing of Late Mesozoic orogeny

机译：中国东南沿海构造区中生代变质岩和花岗岩的锆石U-Pb年代学：晚中生代造山时间的限制

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摘要

The coastal Changle-Nan'ao tectonic zone of SE China contains important geological records of the Late Mesozoic orogeny and post-orogenic extension in this part of the Asian continent. The folded and metamorphosed T_(3-J1), sedimentary rocks are unconformably overlain by Early Cretaceous volcanic rocks or occur as amphibolite facies enclaves in late Jurassic to early Cretaceous gneissic granites. Moreover, all the metamorphic and/or deformed rocks are intruded by Cretaceous fine-grained granitic plutons or dykes. In order to understand the orogenic development, we undertook a comprehensive zircon U-Pb geochronology on a variety of rock types, including paragneiss, migmatitic gneiss, gneissic granite, leu-cogranite, and fine-grained granitoids. Zircon U-Pb dating on gneissic granites, migmatitic gneisses, and leucogranite dyke yielded a similar age range of 147-135 Ma. Meanwhile, protoliths of some gneissic granites and migmatitic gneisses are found to be late Jurassic magmatic rocks (ca. 165-150 Ma). The little deformed and unmetamorphosed Cretaceous plutons or dykes were dated at 132-117 Ma. These new age data indicate that the orogeny lasted from late Jurassic (ca. 165 Ma) to early Cretaceous (ca. 135 Ma). The tectonic transition from the syn-kinematic magmatism and migmatization (147-136 Ma) to the post-kinematic plutonism (132-117 Ma) occurred at 136-132 Ma.
机译：中国东南沿海长乐-南澳构造带包含亚洲大陆这一地区晚中生代造山运动和造山后延伸的重要地质记录。折叠和变质的T_（3-J1）沉积岩不均匀地覆盖在早白垩世的火山岩上，或以侏罗纪至早白垩纪的片麻质花岗岩中的闪石岩相覆盖。此外，所有的变质和/或变形的岩石都被白垩纪的细粒花岗岩体或岩脉侵入。为了了解造山运动的发展，我们对各种岩石类型进行了全面的锆石U-Pb年代学研究，这些岩石类型包括石阶，片麻质片麻岩，片麻岩花岗岩，亮蓝花岗石和细粒花岗岩。片麻岩花岗岩，多片麻岩和白云母岩脉上的锆石U-Pb年龄范围相似，为147-135 Ma。同时，发现一些片麻岩花岗岩和多片麻岩的原生岩为侏罗纪晚期岩浆岩（约165-150 Ma）。变形和未变质的白垩纪小岩体或岩脉年代为132-117 Ma。这些新的年龄数据表明，造山运动从侏罗纪晚期（约165 Ma）一直持续到白垩纪早期（约135 Ma）。从构造运动岩浆活动和迁移作用（147-136 Ma）到运动后岩体活动（132-117 Ma）的构造转变发生在136-132 Ma。

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