| 北山古堡泉地区榴辉岩变质作用P-T-t轨迹及构造意义 |
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| 引用本文：陈言飞,邵兆刚,陈宣华,李杰,王叶,王洛娟,苏和.2022.北山古堡泉地区榴辉岩变质作用P-T-t轨迹及构造意义[J].地球学报,43(6):895-908. |
| DOI：10.3975/cagsb.2022.060901 |
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| 基金项目:中国地质调查局地质调查项目(编号: DD20190011; DD20221643);国家重点研发计划(编号: 2018YFC0603700);中国石油长庆油田公司横向项目(编号: 2021DA0404);中国地质科学院基本科研业务费项目(编号: JKY202011) |
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| 中文摘要:北山造山带南部古堡泉地区出露榴辉岩, 对榴辉岩变质作用P-T-t轨迹的研究, 有助于了解北山地区的构造演化历史。本文对古堡泉地区的榴辉岩开展了岩石学、矿物化学和锆石U-Pb年代学的研究。研究表明, 榴辉岩原岩形成时代为860 Ma, 进变质或近峰期变质时代为~465 Ma, 岩石具有顺时针P-T-t轨迹, 经历了较陡的升温升压过程后到达峰期高压榴辉岩相, 峰期变质条件分别为P>22 kbar、T=660~700 ℃, 之后经历了近等温降压过程。榴辉岩是大陆地壳快速俯冲形成, 俯冲深度达80 km, 之后又经历了快速的折返。 |
| 中文关键词:榴辉岩 P-T-t轨迹 构造意义 北山地区 |
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| P-T-t Path and Tectonic Implications of Gubaoquan Eclogite from Beishan Region |
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| Abstract:The P-T-t path of eclogite from the Gubaoquan area, south of Beishan Orogen, is used to track the tectonic history of the Beishan region. This paper presents novel petrology, mineral chemistry, and geochronology of Beishan eclogite. Zircon U-Pb data show that the protolith of eclogite formed at ~860 Ma with a prograde or near-peak metamorphic age of ~465 Ma. The P-T-t path of the eclogite was clockwise, with an early steep temperature and pressure rise process, subsequent eclogite-facies metamorphism with conditions of >22 kbar and 660?700 ℃, and a late isothermal retrograde decompression process. The eclogite was formed by rapid subduction of continental crust, with a depth of 80 km, followed by rapid exhumation. |
| keywords:eclogite P-T-t path tectonic implication Beishan region |
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