新疆库鲁克塔格富铝片麻岩变质作用及锆石U-Pb年代学研究

摘要

The petrographic,mineral assemblages and metamorphic reactions structure of the Al-rich gneisses which in-ferred three stages of evolution and a clockwise P-T path.Zircon LA-ICP-MS U-Pb dating of the Al-rich gneiss showed that it experienced a peak-gade metamorphism at(1 868±44)Ma.This provides evidence for the occurrence of collision orogenic events related to the assemblage of Columbia supercontinent at late Paleopr-oterozoic in the Tarim block.%通过对库鲁克塔格富铝片麻岩岩相学、变质反应结构研究，推断其经历3个阶段变质演化，具顺时针P-T轨迹。LA-ICP-MS锆石U-Pb年代学研究表明，其经历了（1868±44）Ma的高级变质作用。该结论为古元古代末期塔里木地块发生与哥伦比亚超大陆聚合有关的碰撞造山事件提供了有力证据。