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Source characteristics and provenance of metasedimentary rocks from the Kangxiwa Group in the Western Kunlun Orogenic Belt, NW China: Implications for tectonic setting and crustal growth

文献类型：期刊论文

作者Zhang, Lei1; Long, Xiaoping1,2; Zhang, Rui1; Dong, Yunpeng1; Yuan, Chao2; Xiao, Wenjiao3; Wang, Yujing4
刊名GONDWANA RESEARCH
出版日期2017-06-01
卷号46页码:43-56
关键词Detrital Zircon Depositional Age Crustal Growth Kangxiwa Group Western Kunlun Orogenic Belt
ISSN号1342-937X
DOI10.1016/j.gr.2017.02.014
文献子类Article
英文摘要The West Kunlun Orogenic Belt is a result of the closure of Proto-and Paleo-Tethys Ocean and subsequent continental collision. In order to better understand the tectonic evolution of this orogenic belt, whole-rock geochemistry of major and trace elements, detrital zircon U-Pb geochronology and Lu-Hf isotopic composition were determined for metasediments of the Kangxiwa Group (KG) in the South Kunlun Terrane (SKT). These rocks have low Chemical Index of Alteration and high Index of Compositional Variability values, indicating relatively weak chemical weathering and a source compositionally dominated by immature material that lacks alumina-rich minerals. The rocks are all enriched in light rare earth element and display relatively flat heavy rare earth element patterns. Their low contents of ferromagnesian (e.g. Cr, Co and Ni) and high field strength elements (e.g. Zr, Hf, Nb, Ta and Y) are similar to those of graywackes from active continental margins. Detrital zircons from three samples of the KG metasediments can be divided into igneous and metamorphic grains. Zircon U-Pb dating of the igneous grains shows similar age spectra dominated by Early Paleozoic to late Paleozoic ages. The Precambrian igneous grains yield Neoproterozoic Pb-206/U-238 ages and a few early Mesoproterozoic to Paleoproterozoic Pb-207/Pb-206 ages. The youngest igneous zircons define the maximum depositional age at similar to 307 Ma for the KG metasediments. The U-Pb dating of all the metamorphic grains yield Pb-206/U-238 ages at similar to 245 Ma, suggesting the metasediment rocks were deposited prior to the early Triassic. These results indicate that the KG metasediments were deposited on an active continental margin during the time between late Carboniferous and late Permian. Lu-Hf isotopic analyses of the igneous detrital zircons from the three samples show large variations of epsilon(Hf)(t) values mostly between - 21 and + 12. Combined with their U-Pb ages, two respective crustal growth events are identified in the SKT at the Early Paleozoic and the late Carboniferous. (C) 2017 Published by Elsevier B.V. on behalf of International Association for Gondwana Research.
WOS关键词ZIRCON U-PB ; POTASSIC MICROGRANULAR ENCLAVES ; CALC-ALKALINE GRANITOIDS ; RARE-EARTH-ELEMENTS ; IN-SITU ANALYSIS ; LA-ICP-MS ; NORTHWESTERN CHINA ; SEDIMENTARY-ROCKS ; DETRITAL ZIRCONS ; TIBETAN PLATEAU
WOS研究方向Geology
语种英语
WOS记录号WOS:000399985000003
出版者ELSEVIER SCIENCE BV
资助机构Natural Science Foundation of China(41421002 ; Chinese Academy of Sciences(XDB03010600) ; 41522202) ; Natural Science Foundation of China(41421002 ; Chinese Academy of Sciences(XDB03010600) ; 41522202) ; Natural Science Foundation of China(41421002 ; Chinese Academy of Sciences(XDB03010600) ; 41522202) ; Natural Science Foundation of China(41421002 ; Chinese Academy of Sciences(XDB03010600) ; 41522202)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52968]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Long, Xiaoping
作者单位1.Northwest Univ Xian, Dept Geol, State Key Lab Continental Dynam, Northern Taibai Str 229, Xian 710069, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou, Guangdong, Peoples R China
3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Northwest Univ Xian, Coll Urban & Environm Sci, Northern Taibai St 229, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Lei,Long, Xiaoping,Zhang, Rui,et al. Source characteristics and provenance of metasedimentary rocks from the Kangxiwa Group in the Western Kunlun Orogenic Belt, NW China: Implications for tectonic setting and crustal growth[J]. GONDWANA RESEARCH,2017,46:43-56.
APA Zhang, Lei.,Long, Xiaoping.,Zhang, Rui.,Dong, Yunpeng.,Yuan, Chao.,...&Wang, Yujing.(2017).Source characteristics and provenance of metasedimentary rocks from the Kangxiwa Group in the Western Kunlun Orogenic Belt, NW China: Implications for tectonic setting and crustal growth.GONDWANA RESEARCH,46,43-56.
MLA Zhang, Lei,et al."Source characteristics and provenance of metasedimentary rocks from the Kangxiwa Group in the Western Kunlun Orogenic Belt, NW China: Implications for tectonic setting and crustal growth".GONDWANA RESEARCH 46(2017):43-56.

入库方式： OAI收割

来源：地质与地球物理研究所

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