哈尔里克山晚古生代混合岩地质特征、年代学及其构造意义

doi:10.16108/j.issn1006-7493.2020005

高校地质学报 ›› 2021, Vol. 27 ›› Issue (2): 133-148.DOI: 10.16108/j.issn1006-7493.2020005

• 岩石·矿床·地球化学 • 上一篇下一篇

哈尔里克山晚古生代混合岩地质特征、年代学及其构造意义

倪兴华，王博*，刘珈硕

南京大学地球科学与工程学院，内生金属成矿机制研究国家重点实验室，南京 210023

出版日期:2021-04-20 发布日期:2021-04-20

Geological Features and Geochronology of the Late Paleozoic Migmatites from the Harlik Range and Tectonic Significance

NI Xinghua，WANG Bo*，LIU Jiashuo

State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

Online:2021-04-20 Published:2021-04-20

摘要/Abstract

摘要： 哈尔里克山位于天山造山带东北缘，是古亚洲洋板片俯冲、弧—陆（或弧—弧）增生拼贴造山作用的产物。出露于哈尔里克山南麓的中—高级变质带中发育有混合岩，其成因和时代尚无详细研究。文章对哈尔里克变质带中的混合岩进行了野外岩相—构造分析与LA-ICP-MS 锆石U-Pb 年代学研究。结果显示，该混合岩与高级变质沉积岩紧密伴生，可能是变质沉积岩经部分熔融作用形成的。混合岩带中多条变形程度不同的浅色岩脉的锆石U-Pb 年龄均在332~330 Ma 之间，部分浅色岩脉具有典型的同构造变形特征，从而可以限定哈尔里克山南麓变质带的混合岩化作用发生在330 Ma 左右。结合前人对研究区变质岩和侵入岩的研究结果以及区域地质演化特征，笔者认为哈尔里克山地区在330 Ma 可能已进入了后造山伸展阶段，该变质带中混合岩可能形成于后造山伸展减压部分熔融，是哈尔里克岛弧基底的组成部分，其折返抬升与同期后造山岩体的侵位作用有关。

关键词: 东天山, 哈尔里克山, 晚古生代, 混合岩, 后碰撞伸展, 锆石年龄

Abstract: The Harlik Range is located in the northeastern part of the Tianshan Orogenic Belt and resulted from subduction of the Paleo-Asian Ocean and arc-continent or arc-arc accretionary orogeny. The Harlik metamorphic belt occurs at the southern foot of the Harlik Range and comprises high-grade metamorphic rocks and migmatites. Until now, the timing and genesis of migmatites are poorly studied. In this study, we conducted field structural investigations and LA-ICP-MS zircon U-Pb dating for the migmatites. The results show that the migmatites were likely derived from partial melting of high-grade meta-sedimentary rocks of the Harlik metamorphic belt. Numerous leucocratic dykes and in-source leucosome were deformed in various degrees and yielded consistent zircon U-Pb ages of 332-330 Ma. Considering the syn-kinematic characteristics of the in-source leucosome, it can be proposed that the migmatization and deformation of the Harlik metamorphic belt occurred in ca. 330 Ma. Combining the previous studies on the metamorphic rocks and nearby plutonic rocks and taking the regional tectonic evolution into account, we suggest that the Harlik area probably underwent a post-orogenic setting since 330 Ma. The migmatites were likely formed by decompression partial melting and occurred as part of the basement of the Harlik arc, exhumation and uplifting of which might be related to the emplacement of the coeval post-collisional plutons.

Key words: Eastern Tianshan Orogen, Harlik Range, late Paleozoic, migmatites, post-collisional extension, zircon U-Pb age

中图分类号:

P588.36

倪兴华, 王博, 刘珈硕. 哈尔里克山晚古生代混合岩地质特征、年代学及其构造意义[J]. 高校地质学报, 2021, 27(2): 133-148.

NI Xinghua, WANG Bo, LIU Jiashuo. Geological Features and Geochronology of the Late Paleozoic Migmatites from the Harlik Range and Tectonic Significance[J]. Geological Journal of China Universities, 2021, 27(2): 133-148.

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哈尔里克山晚古生代混合岩地质特征、年代学及其构造意义

Geological Features and Geochronology of the Late Paleozoic Migmatites from the Harlik Range and Tectonic Significance

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