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Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China

文献类型：期刊论文

作者Qian, Qing1; Gao, Jun1; Klemd, Reiner2; He, Guoqi3; Song, Biao4,5; Liu, Dunyi4,5; Xu, Ronghua1
刊名INTERNATIONAL JOURNAL OF EARTH SCIENCES
出版日期2009-04-01
卷号98期号:3页码:551-569
关键词South Tianshan Early Paleozoic MORB Adakite SHRIMP geochronology Geochemistry
ISSN号1437-3254
DOI10.1007/s00531-007-0268-x
文献子类Article
英文摘要Traditionally the Chinese South Tianshan has been regarded as a late Paleozoic orogenic belt. However, little is known about the early Paleozoic tectonic architecture of the region. This paper presents the first evidence of Cambrian-Ordovician MORB-type basalts and adakitic diorites on the southern margin of the Yili plate in China. Basalts from Xiate in southwestern Tianshan show a typical transitional (T-) MORB and ferrobasalt composition, which indicate a formation at a propagating spreading ridge. The basalts give a weighted mean (206)Pb/(238)U crystallization age of 516.3 +/- A 7.4 Ma by SHRIMP U-Pb zircon dating and have experienced contact metamorphism due to the intrusion of a dioritic pluton. The dioritic pluton has a weighted mean (206)Pb/(238)U crystallization age of 470 +/- A 12 Ma and geochemical characteristics resembling that of adakitic rocks. The pluton is considered to have been formed by partial melting of garnet amphibolites from thickened lower crust in arc or continental collision settings. The basalts and diorites are considered to outline the eastern extension of the early Paleozoic suture zone, the Nikolaev Line, which stretches east-west for hundreds of kilometers between the Northern Tianshan and Central Tianshan terranes of Kyrgyzstan. Our findings substantiate that the Yili and Central Tianshan plates were separated by the early Paleozoic Terskey ocean. The Terskey ocean probably closed during the early stage of the late Ordovician (Lomize et al. in Geotectonics 31(6):463-482, 1997), resulting in the final amalgamation of the Yili and Central Tianshan plates. Consequently, an early Paleozoic suture zone is documented in the Chinese Tianshan region, which is most likely represented by the North Nalati fault.
WOS关键词MIDOCEAN RIDGE BASALTS ; LOWER CONTINENTAL-CRUST ; EAST PACIFIC RISE ; TIEN-SHAN ; NORTHWESTERN CHINA ; VOLCANIC-ROCKS ; CENTRAL-ASIA ; SUBDUCTED LITHOSPHERE ; OPHIOLITE COMPLEX ; AGE CONSTRAINTS
WOS研究方向Geology
语种英语
WOS记录号WOS:000264482600005
出版者SPRINGER
资助机构State Key Project for Basic Research of China(2007CB411302 ; State Key Project for Basic Research of China(2007CB411302 ; National Natural Science Foundation of China(40672153 ; National Natural Science Foundation of China(40672153 ; 2001CB409803) ; 2001CB409803) ; 40472047) ; 40472047) ; State Key Project for Basic Research of China(2007CB411302 ; State Key Project for Basic Research of China(2007CB411302 ; National Natural Science Foundation of China(40672153 ; National Natural Science Foundation of China(40672153 ; 2001CB409803) ; 2001CB409803) ; 40472047) ; 40472047) ; State Key Project for Basic Research of China(2007CB411302 ; State Key Project for Basic Research of China(2007CB411302 ; National Natural Science Foundation of China(40672153 ; National Natural Science Foundation of China(40672153 ; 2001CB409803) ; 2001CB409803) ; 40472047) ; 40472047) ; State Key Project for Basic Research of China(2007CB411302 ; State Key Project for Basic Research of China(2007CB411302 ; National Natural Science Foundation of China(40672153 ; National Natural Science Foundation of China(40672153 ; 2001CB409803) ; 2001CB409803) ; 40472047) ; 40472047)
源URL[http://ir.iggcas.ac.cn/handle/132A11/70920]  
专题中国科学院地质与地球物理研究所
通讯作者Qian, Qing
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Wurzburg, Inst Mineral, D-97074 Wurzburg, Germany
3.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
4.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Beijing 100081, Peoples R China
5.Chinese Acad Geol Sci, Inst Geol, Beijing 100081, Peoples R China
推荐引用方式
GB/T 7714		 Qian, Qing,Gao, Jun,Klemd, Reiner,et al. Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2009,98(3):551-569.
APA Qian, Qing.,Gao, Jun.,Klemd, Reiner.,He, Guoqi.,Song, Biao.,...&Xu, Ronghua.(2009).Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China.INTERNATIONAL JOURNAL OF EARTH SCIENCES,98(3),551-569.
MLA Qian, Qing,et al."Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China".INTERNATIONAL JOURNAL OF EARTH SCIENCES 98.3(2009):551-569.

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来源：地质与地球物理研究所

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