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首页> 外文期刊>International Geology Review >Tectonic Evolution of the West Kunlun: Geochronologic and Geochemical Constraints from Kudi Granitoids
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Tectonic Evolution of the West Kunlun: Geochronologic and Geochemical Constraints from Kudi Granitoids

机译：西昆仑的构造演化：古帝花岗岩的年代学和地球化学约束

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摘要

The West Kunlun contains important information about the early evolutionary history of the Tibetan Plateau. Single-grain zircon U-Pb dating and systematic geochemical analyses were conducted on representative granitic plutons from the Kudi area. The earliest Paleozoic magmatism (471 +- 5 Ma) possesses characteristics of volcanic-arc granites, indicating that Proto-Tethys started to close in the Mid-Ordovician. An arc-continent collision occurred in the Late Ordovician. corresponding to the closure of Proto-Tethys. Following the collision, extensional deformation began in the Early Devonian and gave rise to a post-dynamic, A-type North Kudi Pluton (405+-2 Ma) and coeval lamprophyre dikes. Extension was pervasive throughout the whole Kunlun orogenic belt, and was responsible for Devonian to Early Permian magmatic quiescence. The reoccurrence of magmatism in the West Kunlun took place in the Early Permian, when Paleo-Tethys started to be consumed, and a new subduction zone developed in the West Kunlun. Paleo-Tethys closed by the Late Triassic (214+-1 Ma), and led to rapid uplift and voluminous post-collisional granites.
机译：西昆仑包含有关青藏高原早期演化历史的重要信息。对来自库迪地区的代表性花岗岩岩体进行了单晶锆石U-Pb测年和系统的地球化学分析。最早的古生代岩浆作用（471±5 Ma）具有火山弧花岗岩的特征，表明原始的特提斯在中奥陶纪开始关闭。奥陶纪晚期发生了弧-大陆碰撞。对应于原特提斯人的关闭。碰撞之后，伸展运动开始于泥盆纪早期，并产生了动力后的A型北库迪岩体（405 + -2 Ma）和同时代的煌斑岩。整个昆仑造山带普遍存在伸展运动，是泥盆纪至早二叠纪岩浆静止的原因。西昆仑的岩浆活动再次发生于二叠纪早期，当时古特提斯开始被消耗，西昆仑又形成了一个新的俯冲带。古特提斯山被晚三叠世（214 + -1 Ma）封闭，导致快速隆升和大量的碰撞后花岗岩。

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