Zircon U-Pb Geochronology and Hf Isotopic ConstraintsOn Petrogenesis of Plagiogranite from the Cuomuqu Ophiolite, Bangong Lake Area, North Tibet
基金项目:

We are grateful for Prof. Zhou Guoqing for analytical assistance, Liu Weiliang, Liu Hongfei and Huang Wei for wild guidance,?Assc.?Prof.?Dr. Choong Kok Keong, Xu Yin and Dr. Argyrios N. Kapsiotis for English revision. We appreciate Qi Liang and Tu Xianglin for elements and age analyses, Huang Yi for helpful discussion. This work was supported by the National Nature Science Foundation of China [No.41372208 and 41472054], the Foundation of China Geological Survey [No.1212011121259, 1212011121262 and 1212011221087] and the Open found of the State Key Laboratory of Ore Deposit Geochemistry, CAS [No.201304].


Zircon U-Pb Geochronology and Hf Isotopic ConstraintsOn Petrogenesis of Plagiogranite from the Cuomuqu Ophiolite, Bangong Lake Area, North Tibet
Author:
  • YIN Zhengxin

    YIN Zhengxin

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • YUAN Yajuan

    YUAN Yajuan

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • LÜ Baofeng

    LÜ Baofeng

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • CAI Zhourong

    CAI Zhourong

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • ZHENG Hao

    ZHENG Hao

    2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.4 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China
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  • HUANG Qiangtai

    HUANG Qiangtai

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • XIA Bin

    XIA Bin

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • ZHONG Yun

    ZHONG Yun

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • XIA Zhongyu

    XIA Zhongyu

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • SHI Xiaolong

    SHI Xiaolong

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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  • GUAN Yao

    GUAN Yao

    1 School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China.2 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes, Guangzhou 510006, China.3 Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China.
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Fund Project:

We are grateful for Prof. Zhou Guoqing for analytical assistance, Liu Weiliang, Liu Hongfei and Huang Wei for wild guidance,?Assc.?Prof.?Dr. Choong Kok Keong, Xu Yin and Dr. Argyrios N. Kapsiotis for English revision. We appreciate Qi Liang and Tu Xianglin for elements and age analyses, Huang Yi for helpful discussion. This work was supported by the National Nature Science Foundation of China [No.41372208 and 41472054], the Foundation of China Geological Survey [No.1212011121259, 1212011121262 and 1212011221087] and the Open found of the State Key Laboratory of Ore Deposit Geochemistry, CAS [No.201304].

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    摘要:

    Field observation, geochemical signatures and zircon Hf isotope data indicate that Cuomuqu ophiolite in the Bangonghu area was formed in a back-arc basin (BAB) above a supra-subduction zone (SSZ). Zircon U-Pb dating of the diabase from the Cuomuqu massif yielded an age of 164.3±1.9 Ma, thus indicating that the ophiolite complex was formed in the Middle Jurassic during back-arc extension of the mature Bangonghu-Nujiang Ocean. The zircon εHf(t) and TDMC values of the plagiogranite are similar to the εHf(t) and TDM of the diabase, respectively. The mode of occurrence of plagiogranites and their bulk-rock and Hf isotope characteristics indicate that they were derived from the mantle, associated with the surrounding gabbro and diabase, and were formed by partial melting of altered and hydrated mafic rocks under shear conditions during lateral drifting of the oceanic crust. The zircon U-Pb age of the plagiogranite is 156.4±1.4 Ma, and it is 7.9 Ma younger than the hosting diabase. In this study, zircon chronological and Hf isotopic data were tentatively analyzed to determine the genesis of plagiogranites in the Cuomuqu ophiolite complex.

    Abstract:

    Field observation, geochemical signatures and zircon Hf isotope data indicate that Cuomuqu ophiolite in the Bangonghu area was formed in a back-arc basin (BAB) above a supra-subduction zone (SSZ). Zircon U-Pb dating of the diabase from the Cuomuqu massif yielded an age of 164.3±1.9 Ma, thus indicating that the ophiolite complex was formed in the Middle Jurassic during back-arc extension of the mature Bangonghu-Nujiang Ocean. The zircon εHf(t) and TDMC values of the plagiogranite are similar to the εHf(t) and TDM of the diabase, respectively. The mode of occurrence of plagiogranites and their bulk-rock and Hf isotope characteristics indicate that they were derived from the mantle, associated with the surrounding gabbro and diabase, and were formed by partial melting of altered and hydrated mafic rocks under shear conditions during lateral drifting of the oceanic crust. The zircon U-Pb age of the plagiogranite is 156.4±1.4 Ma, and it is 7.9 Ma younger than the hosting diabase. In this study, zircon chronological and Hf isotopic data were tentatively analyzed to determine the genesis of plagiogranites in the Cuomuqu ophiolite complex.

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YIN Zhengxin, YUAN Yajuan, Lü Baofeng, CAI Zhourong, ZHENG Hao, HUANG Qiangtai, XIA Bin, ZHONG Yun, XIA Zhongyu, SHI Xiaolong, GUAN Yao.2015. Zircon U-Pb Geochronology and Hf Isotopic ConstraintsOn Petrogenesis of Plagiogranite from the Cuomuqu Ophiolite, Bangong Lake Area, North Tibet[J]. ACTA GEOLOGICA SINICA(English edition),89(2):418~440

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  • 收稿日期:2014-09-11
  • 最后修改日期:2015-01-20
  • 在线发布日期: 2015-04-14
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