| 从西南天山超高压变质带多期构造变形看天山古生代构造演化 |
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| 引用本文： | 林伟,黎乐,张仲培,石永红,李秋立,薛振华,王非,吴林.从西南天山超高压变质带多期构造变形看天山古生代构造演化[J].岩石学报,2015,31(8):2115-2128. |
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| 作者姓名： | 林伟 黎乐 张仲培 石永红 李秋立 薛振华 王非 吴林 |
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| 作者单位： | 岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029,岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029,石油勘探开发研究院, 中国石油化工集团公司, 北京 10008,合肥工业大学资源和环境学院, 合肥 230009,岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029,岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029,岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029,岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029 |
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| 基金项目： | 本文受国家自然科学基金项目(41225009、41472193)和国家科技重大专项项目(2011ZX05008-001)联合资助. |
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| 摘 要： | 通过对西南天山阿克雅孜和木扎尔特地区高压-超高压变质带构造几何学和岩石变形相关运动学的详细剖析,厘定出高压-超高压变质岩石及其相关围岩的构造单元。详细研究表明,研究区可划分为三个构造单元:北部单元、中部单元和南部单元。确定了每个构造单元的构造几何学特征及各个构造单元之间的相互关系。通过分析岩石变形特征和叠加关系,确定了岩石所记录多期变形的运动学特征。根据研究区的多期构造变形特点,建立了阿克雅孜和木扎尔特河地区构造演化序列。共划分出四期构造可识别的事件(E1-E4),分别代表了E1:高压-超高压岩石折返过程;E2:高压-超高压岩石造山带的早期改造过程;E3:北部构造事件对高压-超高压造山带影响;E4:走滑构造对高压-超高压造山带的叠加。沿造山带系列构造分析表明,西南天山高压-超高压带中发育的四期构造事件沿中天山北缘具有很好的一致性,各期构造事件也有一定的横向可对比性。在此基础上通过对多期变形事件的构造背景的探讨,建立了整个天山在古生代的构造拼合过程,揭示我国西部洋壳相关的深俯冲造山带形成过程和参与深俯冲作用(超)高压变质岩的变形变质历史。
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| 关 键 词： | 西南天山 高压-超高压变质带 构造分析 多期构造变形 构造演化 |
| 收稿时间： | 2014/8/15 0:00:00 |
| 修稿时间： | 2014/11/19 0:00:00 |
Paleozoic tectonic of evolution of Tianshan orogen: In the view from a structure analysis of the HP-UHP metamorphic belt of SW Chinese Tianshan |
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| LIN Wei,LI Le,ZHANG ZhongPei,SHI YongHong,LI QiuLi,XUE ZhenHu,WANG Fei and WU Lin.Paleozoic tectonic of evolution of Tianshan orogen: In the view from a structure analysis of the HP-UHP metamorphic belt of SW Chinese Tianshan[J].Acta Petrologica Sinica,2015,31(8):2115-2128. |
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| Authors: | LIN Wei LI Le ZHANG ZhongPei SHI YongHong LI QiuLi XUE ZhenHu WANG Fei and WU Lin |
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| Institution: | State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,SINOPEC Research Institute of Petroleum Exploration and Development, Beijing 10008,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China and State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The south-western Chinese Tianshan orogenic belt is famous for its UHP metamorphism. On the basis of the analysis including bulk geometry of structures and kinematic analyses, based on field and laboratory studies along the Akyazi, Keburt and Muzaert rivers, three tectonic units have been recognized, namely 1) a Southern Unit composed of weakly metamorphosed sedimentary rocks of Silurian age; 2) a Central HP/LT Unit composed of blueschist-eclogite-facies metamorphic rocks derived from basalts, pelites and volcaniclastic rocks; 3) a Northern Unit, which consists of a Carboniferous magmatic arc developed upon an amphibolite- facies metamorphic continental basement are established. Our structural analysis documents multi-phase tectonic events. The main event (E1) is reflected by top-to-the northwest ductile shearing (D1), coeval with HP/LT metamorphism with the age around 320Ma. This is followed by north-directed thrusting (D2) of the Southern Unit over the Central Unit, coeval with retrogression of the high-pressure rocks (E2). A top-to-the-S (SE) thrust event (D3) overprints the earliest events and is observed in the Northern and Central Units (E3). Lastly, Permian dextral ductile-brittle wrenching (D4) overprints the older flat-lying fabrics (E4). E4 is conspicuous along the Nalati Fault that separates the Northern Unit from the Central Unit. These multi-phase tectonic events could be observed along the entire Tianshan belt. Finally, the structural and geochronological data are integrated into a geodynamic model of the Chinese Tianshan that emphasizes south-directed subduction of the Junggar plate, North Tianshan-Yili-Kazakhstan plate and Central Tianshan microcontinent during the Early to Middle Paleozoic. |
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| Keywords: | SW Chinese Tianshan UHP metamorphic belt Structural analysis Polyphase deformation Tectonic evolution |
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