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Ordovician Granitoids and Silurian Mafic Dikes in the Western Kunlun Orogen, Northwest China:Implications for Evolution of the Proto-Tethys
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  • 英文篇名:Ordovician Granitoids and Silurian Mafic Dikes in the Western Kunlun Orogen, Northwest China:Implications for Evolution of the Proto-Tethys
  • 作者:ZHANG ; Qichao ; WU ; Zhenhan ; LI ; Shan ; LI ; Kan ; LIU ; Zhiwei ; ZHOU ; Qing
  • 英文作者:ZHANG Qichao;WU Zhenhan;LI Shan;LI Kan;LIU Zhiwei;ZHOU Qing;Chinese Academy of Geological Sciences;Key Laboratory of Deep-Earth Dynamics, Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences;Xi'an Institute of Geology and Mineral Resources,Chinese Geological Survey;Chengdu Institute of Geology and Mineral Resources,Chinese Geological Survey;
  • 英文关键词:High-K calc-alkaline granitoids;;mafic dikes;;Western Kunlun Orogen;;Proto-Tethys
  • 中文刊名:DZXW
  • 英文刊名:地质学报(英文版)
  • 机构:Chinese Academy of Geological Sciences;Key Laboratory of Deep-Earth Dynamics, Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences;Xi'an Institute of Geology and Mineral Resources,Chinese Geological Survey;Chengdu Institute of Geology and Mineral Resources,Chinese Geological Survey;
  • 出版日期:2019-02-15
  • 出版单位:Acta Geologica Sinica(English Edition)
  • 年:2019
  • 期:v.93
  • 基金:funded by the Strategic Priority Research Program of Chinese Academy of Sciences,Grant No.XDA20070304;; the Fundamental Research Funds for the Chinese Academy of Geological Sciences(YYWF201601);; projects of China Geological Survey(DD20160004,20160083-1,12120115000801,121201101000150014);; the National Natural Science Foundation of China(grant 41772232)
  • 语种:英文;
  • 页:DZXW201901003
  • 页数:20
  • CN:01
  • ISSN:11-2001/P
  • 分类号:34-53
摘要
The western Kunlun orogen in the northwest Tibet Plateau is related to subduction and collision of Proto-and Paleo-Tethys from early Paleozoic to early Mesozoic. This paper presents new LA-ICPMS zircon U-Pb ages and Lu-Hf isotopes, whole-rock major and trace elements, and Sr–Nd isotopes of two Ordovician granitoid plutons(466–455 Ma) and their Silurian mafic dikes(~436 Ma) in the western Kunlun orogen. These granitoids show peraluminous high-K calcalkaline characteristics, with(~(87)Sr/~(86)Sr)_i value of 0.7129–0.7224, ε_(Nd)(t) values of -9.3 to -7.0 and zircon ε_(Hf)(t) values of -17.3 to -0.2, indicating that they were formed by partial melting of ancient lower-crust(metaigneous rocks mixed with metasedimentary rocks) with some mantle materials in response to subduction of the Proto-Tethyan Ocean and following collision. The Silurian mafic dikes were considered to have been derived from a low degree of partial melting of primary mafic magma. These mafic dikes show initial ~(87)Sr/~(86)Sr ratios of 0.7101–0.7152 and ε_(Nd)(t) values of -3.8 to -3.4 and zircon ε_(Hf)(t) values of -8.8 to -4.9, indicating that they were derived from enriched mantle in response to post-collisional slab break-off. Combined with regional geology, our new data provide valuable insight into late evolution of the Proto-Tethys.
        The western Kunlun orogen in the northwest Tibet Plateau is related to subduction and collision of Proto-and Paleo-Tethys from early Paleozoic to early Mesozoic. This paper presents new LA-ICPMS zircon U-Pb ages and Lu-Hf isotopes, whole-rock major and trace elements, and Sr–Nd isotopes of two Ordovician granitoid plutons(466–455 Ma) and their Silurian mafic dikes(~436 Ma) in the western Kunlun orogen. These granitoids show peraluminous high-K calcalkaline characteristics, with(~(87)Sr/~(86)Sr)_i value of 0.7129–0.7224, ε_(Nd)(t) values of -9.3 to -7.0 and zircon ε_(Hf)(t) values of -17.3 to -0.2, indicating that they were formed by partial melting of ancient lower-crust(metaigneous rocks mixed with metasedimentary rocks) with some mantle materials in response to subduction of the Proto-Tethyan Ocean and following collision. The Silurian mafic dikes were considered to have been derived from a low degree of partial melting of primary mafic magma. These mafic dikes show initial ~(87)Sr/~(86)Sr ratios of 0.7101–0.7152 and ε_(Nd)(t) values of -3.8 to -3.4 and zircon ε_(Hf)(t) values of -8.8 to -4.9, indicating that they were derived from enriched mantle in response to post-collisional slab break-off. Combined with regional geology, our new data provide valuable insight into late evolution of the Proto-Tethys.
引文
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