| 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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| 关键词:eclogite P-T-t path tectonic implication Beishan region |
| 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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| P-T-t Path and Tectonic Implications of Gubaoquan Eclogite from Beishan Region |
| 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. |
| CHEN Yan-fei,SHAO Zhao-gang,CHEN Xuan-hua,LI Jie,WANG Ye,WANG Luo-juan,SU He.2022.P-T-t Path and Tectonic Implications of Gubaoquan Eclogite from Beishan Region[J].Acta Geoscientica Sinica,43(6):895-908. |
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