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Palaeozoic tectonics of the south-western Chinese Tianshan: new insights from a structural study of the high-pressure/low-temperature metamorphic belt

文献类型：期刊论文

作者Lin, Wei1; Faure, Michel2; Shi, Yonghong3; Wang, Qingchen1; Li, Zhong1
刊名INTERNATIONAL JOURNAL OF EARTH SCIENCES
出版日期2009-09-01
卷号98期号:6页码:1259-1274
关键词Structural analysis Polyphase deformation HP metamorphism Chinese Tianshan Palaeozoic geodynamics
ISSN号1437-3254
DOI10.1007/s00531-008-0371-7
文献子类Review
英文摘要The south-western Chinese Tianshan orogenic belt is famous for its omphacite-bearing blueschists and associated eclogite-facies metavolcanic rocks. Although numerous petrologic, geochemical and geochronological studies are available, structural data and interpretations are still rare. This paper provides new structural data, including bulk geometry of structures and kinematic analyses, based on field and laboratory studies along the Akyazhi, Keburt and Muzaert Rivers. The study area is divided into three tectonic units, 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. Our structural analysis documents a polyphase deformation. The main event (D(1)) is reflected by Devonian to Carboniferous top-to-the northwest ductile shearing, coeval with HP/LT metamorphism. This is followed by north-directed thrusting (D(2)) of the Southern Unit over the Central HP/LT Unit, coeval with retrogression of the high-pressure rocks. A top-to-the-S (SE) deformation (D(3)) overprints the earliest events and is observed in the Northern and Central Units. Lastly, Permian dextral ductile-brittle wrenching (D(4)) overprints the older flat-lying fabrics. D(4) is conspicuous along the Nalati Fault that separates the Northern Unit from the Central HP/LT Unit. The absolute timing of these deformation events is discussed in the light of available radiometric dating. The structural, metamorphic and geochronological data are integrated into a geodynamic model of the south-western Chinese Tianshan that emphasizes south-directed subduction of microcontinents located between Tarim and Junggar.
WOS关键词CARBONIFEROUS VOLCANIC-ROCKS ; ASIAN OROGENIC BELT ; HP-LT ROCKS ; P-T PATH ; NW CHINA ; TIEN-SHAN ; YILI BLOCK ; COLLISIONAL TECTONICS ; GEODYNAMIC EVOLUTION ; CONTINENTAL GROWTH
WOS研究方向Geology
语种英语
WOS记录号WOS:000269376400005
出版者SPRINGER
资助机构Chinese National 973 Project(2009CB825008) ; Chinese National 973 Project(2009CB825008) ; NSFC(40472069) ; NSFC(40472069) ; Chinese National 973 Project(2009CB825008) ; Chinese National 973 Project(2009CB825008) ; NSFC(40472069) ; NSFC(40472069) ; Chinese National 973 Project(2009CB825008) ; Chinese National 973 Project(2009CB825008) ; NSFC(40472069) ; NSFC(40472069) ; Chinese National 973 Project(2009CB825008) ; Chinese National 973 Project(2009CB825008) ; NSFC(40472069) ; NSFC(40472069)
源URL[http://ir.iggcas.ac.cn/handle/132A11/71283]  
专题中国科学院地质与地球物理研究所
通讯作者Lin, Wei
作者单位1.Chinese Acad Sci, SKL, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Orleans, CNRS, ISTO, UMR 6113, F-45067 Orleans 2, France
3.Hefei Univ Technol, Dept Geol, Sch Resource & Environm Engn, Hefei 230009, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Lin, Wei,Faure, Michel,Shi, Yonghong,et al. Palaeozoic tectonics of the south-western Chinese Tianshan: new insights from a structural study of the high-pressure/low-temperature metamorphic belt[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2009,98(6):1259-1274.
APA Lin, Wei,Faure, Michel,Shi, Yonghong,Wang, Qingchen,&Li, Zhong.(2009).Palaeozoic tectonics of the south-western Chinese Tianshan: new insights from a structural study of the high-pressure/low-temperature metamorphic belt.INTERNATIONAL JOURNAL OF EARTH SCIENCES,98(6),1259-1274.
MLA Lin, Wei,et al."Palaeozoic tectonics of the south-western Chinese Tianshan: new insights from a structural study of the high-pressure/low-temperature metamorphic belt".INTERNATIONAL JOURNAL OF EARTH SCIENCES 98.6(2009):1259-1274.

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来源：地质与地球物理研究所

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