| 西昆仑康西瓦断裂西段斜长片麻岩LA-ICP-MS锆石U-Pb定年及其构造意义 |
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| 引用本文： | 康磊,校培喜,高晓峰,董增产,过磊,奚仁刚.西昆仑康西瓦断裂西段斜长片麻岩LA-ICP-MS锆石U-Pb定年及其构造意义[J].地质通报,2012,31(8):1244-1250. |
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| 作者姓名： | 康磊 校培喜 高晓峰 董增产 过磊 奚仁刚 |
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| 作者单位： | 中国地质调查局西安地质矿产研究所,陕西西安,710054 |
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| 基金项目： | 中国地质调查局项目，陕西省自然科学基金 |
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| 摘 要： | 在康西瓦断裂西段发育着一套含石榴子石二云斜长片麻岩。根据锆石的阴极发光图像和Th、U、REE等特征,锆石可分为岩浆成因和变质热液成因2类。利用LA-ICP-MS法进行锆石U-Pb定年,测得含石榴子石斜长片麻岩的源岩形成年龄为254.5Ma±4.2Ma(MSWD=0.16),变质年龄为242.7Ma±2.3Ma(MSWD=0.11)。结合区域地质资料,含石榴子石二云斜长片麻岩的变质作用与古特提斯碰撞造山有关,表明西昆仑造山带在中三叠世早期(243Ma)仍处于古特提斯碰撞造山期。
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| 关 键 词： | 西昆仑 含石榴子石二云斜长片麻岩 LA-ICP-MS锆石U-Pb测年 构造意义 |
LA-ICP-MS zircon U-Pb dating of garnet-bearing muscovite-biotite plagioclase gneiss in western Kangxiwar fault of Western Kunlun and its tectonic significance |
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| KANG Lei
,
XIAO Pei-xi
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GAO Xiao-feng
,
DONG Zeng-chan
,
GUO Lei
,
XI Ren-gang.LA-ICP-MS zircon U-Pb dating of garnet-bearing muscovite-biotite plagioclase gneiss in western Kangxiwar fault of Western Kunlun and its tectonic significance[J].Geologcal Bulletin OF China,2012,31(8):1244-1250. |
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| Authors: | KANG Lei XIAO Pei-xi GAO Xiao-feng DONG Zeng-chan GUO Lei XI Ren-gang |
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| Institution: | Xi′an Institute of Geology and Mineral Resources,China Geological Survey,Xi′an 710054,China |
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| Abstract: | There exists garnet-bearing muscovite-biotite plagioclase gneiss in western kangxiwar fault. According to cathodoluminescence (CL) images and Th, U, REE characteristics, the zircons can be classified into magmatic zircons and metamorphic-hydrothermal ones. Zircon LA-ICP-MS U-Pb dating shows that the age of the protolith of the garnet-bearing plagioclase gneiss is 254.5Ma±4.2Ma (MSWD=0.16), and the age of its metamorphism is 242.7Ma±2.3Ma(MSWD=0.11). In combination with regional geological information, the authors hold that the metamorphism of garnet-bearing plagioclase gneiss was related to the collision and orogeny of Paleo-Tethys, suggesting that the Western Kunlun orogenic belt was still in the period of Paleo-Tethys collision in early Middle Triassic. |
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| Keywords: | Western Kunlun garnet-bearing muscovite-biotite plagioclase gneiss LA-ICP-MS zircon U-Pb dating tectonic significance |
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