Ages of the Laocheng Granitoids and Crustal Growth in the South Qinling Tectonic Domain, Central China: Zircon U-Pb and Lu-Hf Isotopic Constraints
基金项目:

This study is financially supported by the National Project of Scientific and Technological Support (Grant No: 2006BAB01A11).


Ages of the Laocheng Granitoids and Crustal Growth in the South Qinling Tectonic Domain, Central China: Zircon U-Pb and Lu-Hf Isotopic Constraints
Author:
  • YANG Pengtao

    YANG Pengtao

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • LIU Shuwen

    LIU Shuwen

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • LI Qiugen

    LI Qiugen

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • ZHANG Fan

    ZHANG Fan

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • WANG Zongqi

    WANG Zongqi

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • WANG Dongsheng

    WANG Dongsheng

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • WANG Ruiting

    WANG Ruiting

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • YAN Quanren

    YAN Quanren

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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  • YAN Zhen

    YAN Zhen

    1 The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871 ;2 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;3 Northwest Geological Exploration and Mining Bureau for Nonferrous Metals, Xi’an, Shaanxi 710054 ;4 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
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Fund Project:

This study is financially supported by the National Project of Scientific and Technological Support (Grant No: 2006BAB01A11).

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    摘要:

    The Laocheng granitoid pluton is located in the South Qinling tectonic domain of the Qinling orogenic belt, southern Shaanxi Province, and consists chiefly of quartz diorite, granodiorite and monzogranite. A LA-ICP-MS zircon U-Pb isotopic dating, in conjunction with cathodoluminescence images, reveals that the quartz diorite and granodiorite were emplaced from 220 Ma to 216 Ma, while the monzogranite was emplaced at ~210 Ma. In-situ zircon Hf isotopic analyses show that the εHf(t) values of the quartz diorite and granodiorite range from -8.1 to +1.3, and single-stage Hf model ages from 809 Ma to 1171 Ma, while the εHf(t) values of the monzogranite are -14.5 to +16.7 and single-stage Hf model ages from 189 Ma to 1424 Ma. These Hf isotopic features reveal that the quartz diorite, granodiorite and monzogranite were formed from the mixing of the magmas derived from partial melting of the depleted mantle and the lower continent crustal materials, and there were two stages of continental crust growth during the Neoproterozoic (~800 Ma) and Indosinian (~210 Ma) eras, respectively, in the south Qinling tectonic domain of the Qinling orogrnic belt, Central China.

    Abstract:

    The Laocheng granitoid pluton is located in the South Qinling tectonic domain of the Qinling orogenic belt, southern Shaanxi Province, and consists chiefly of quartz diorite, granodiorite and monzogranite. A LA-ICP-MS zircon U-Pb isotopic dating, in conjunction with cathodoluminescence images, reveals that the quartz diorite and granodiorite were emplaced from 220 Ma to 216 Ma, while the monzogranite was emplaced at ~210 Ma. In-situ zircon Hf isotopic analyses show that the εHf(t) values of the quartz diorite and granodiorite range from -8.1 to +1.3, and single-stage Hf model ages from 809 Ma to 1171 Ma, while the εHf(t) values of the monzogranite are -14.5 to +16.7 and single-stage Hf model ages from 189 Ma to 1424 Ma. These Hf isotopic features reveal that the quartz diorite, granodiorite and monzogranite were formed from the mixing of the magmas derived from partial melting of the depleted mantle and the lower continent crustal materials, and there were two stages of continental crust growth during the Neoproterozoic (~800 Ma) and Indosinian (~210 Ma) eras, respectively, in the south Qinling tectonic domain of the Qinling orogrnic belt, Central China.

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YANG Pengtao, LIU Shuwen, LI Qiugen, ZHANG Fan, WANG Zongqi, WANG Dongsheng, WANG Ruiting, YAN Quanren, YAN Zhen.2011. Ages of the Laocheng Granitoids and Crustal Growth in the South Qinling Tectonic Domain, Central China: Zircon U-Pb and Lu-Hf Isotopic Constraints[J]. ACTA GEOLOGICA SINICA(English edition),85(4):854~869

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  • 收稿日期:2011-01-01
  • 最后修改日期:2011-03-30
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