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青海南山构造带西段黑马河花岗杂岩体锆石U-Pb年代学、地球化学特征及其地质意义
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本文为国家自然科学基金资助项目（编号：41472191、41502191、41172186）、中国地质调查局地质调查项目（编号：12120114041201、12120114018219）、中央高校基本科研业务费专项资金项目（编号：CHD2011TD020、2013G1271091、2013G1271092）的成果。


LA-ICP-MS Zircon U-Pb Dating，Geochemistry and Its Geological Significance of the Heimahe Granitic Pluton in the Western Segment of the Qinghai’nanshan Tectonic Belt
Author:
  • ZHANG Yongming

    ZHANG Yongming

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054;2） Faculty of Resources and Environmental Engineering，Shandong University of Technology，Zibo,Shandong, 255049
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  • PEI Xianzhi

    PEI Xianzhi

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054
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  • LI Zuochen

    LI Zuochen

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054
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  • LI Ruibao

    LI Ruibao

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054
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  • LIU Chengjun

    LIU Chengjun

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054
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  • PEI Lei

    PEI Lei

    3）China University of Geosciences，Beijing，100083
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  • CHEN Youxin

    CHEN Youxin

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054
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  • CHEN Guochao

    CHEN Guochao

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054；4）Nanyang Institutte of Technology，Nanyang，Henan,473000
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  • WANG Meng

    WANG Meng

    1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054
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单位:
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054；2）山东理工大学资源与环境工程学院，山东淄博， 255049    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054    
  • 3）中国地质大学（北京）地球科学与资源学院，北京，100083    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054；4）南阳理工学院土木工程学院，河南南阳， 473000    
  • 1）西部矿产资源与地质工程教育部重点实验室，国土资源部岩浆作用成矿与找矿重点实验室，长安大学地球科学与资源学院，西安， 710054    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054;2） Faculty of Resources and Environmental Engineering，Shandong University of Technology，Zibo,Shandong, 255049    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054    
  • 3）China University of Geosciences，Beijing，100083    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054；4）Nanyang Institutte of Technology，Nanyang，Henan,473000    
  • 1） Key Laboratory of Western China’s Mineral Resources and Geological Engineering，Ministry of Education，Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits，MLR，Faculty of Earth Science and Resources Chang’an University，Xi’an, 710054    
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    摘要:

    本文对青海南山构造带西段黑马河花岗杂岩体中的石英闪长岩和花岗闪长岩以及花岗闪长岩中的暗色微粒包体进行了详细的岩石学、岩石地球化学和LAI-CP-MS锆石U-Pb年代学研究。结果表明，花岗闪长岩及暗色微粒包体的结晶年龄分别为244.4 ± 1.1 Ma和243.0 ± 1.2 Ma，表明岩体形成于中三叠世早期。石英闪长岩和花岗闪长岩为准铝质高钾钙碱性系列，暗色微粒包体为高钾钙碱性—钾玄岩系列，稀土元素配分曲线均具有轻重稀土明显分异的右倾特征，具弱负Eu异常（δEu = 0.65 ~ 0.83），富集大离子亲石元素（Cs、Rb、Th、K）和Pb，亏损高场强元素（Nb、Ta、Ti）和P、Ba负异常。岩相学和岩石地球化学特征指示黑马河花岗杂岩体具壳幔岩浆混合特征，形成于活动大陆边缘的俯冲环境，石英闪长岩为受俯冲流体交代的地幔楔部分熔融产生的基性岩浆演化的产物，花岗闪长岩则源自壳源岩浆与少量幔源岩浆的混合。黑马河花岗杂岩体是中三叠世早期宗务隆洋向南俯冲消减的岩浆记录。

    Abstract:

    Objectives:As a granitic pluton in the west part of the Qinghai’nanshan tectonic belt，the Heimahe granitic pluton are mainly composed of granodiorite, quartz diorite, diorite and gabbro. The formation age and geochemical affinity of those rocks play a key role for investigating the transitional relation between the west Qinling and the Qilian orogenic belts in Paleozoic Tethys evolution stage． Methods:In this paper，a detailed study of LA-ICP-MS zircon U-Pb dating，petrology and geochemistry characteristics was carried out for quartz diorite，granodiorite and mafic microgranular enclaves from the Heimahe granitic pluton． Results:The LA-ICP-MS zircon U-Pb ages of the granodiorite and MMEs are 244.4 ± 1.1 Ma and 243.0 ± 1.2 Ma，respectively，indicating that the Heimahe granitic pluton formed in early Middle Triassic．The whole rock geochemical data show that quartz diorite and granodiorite belong to the metaluminous high-K calc-alkaline series and MMEs are high-K calc-alkaline to alkaline series．The REE patterns display rightward incline and weak negative Eu anomalies（δEu = 0.65 ~ 0.83）．The trace element geochemistry is evidently characterized by positive anomaly of LILEs（e.g. Cs，Rb，Th，K）and Pb，negative anomaly of HFSE（e.g. Nb，Ta，Ti）and P，Ba． Conclusions:The petrographic and geochemical characteristics of the Heimahe granitic pluton imply a closely subductionrelated origin at active continental margin arcs，with crust—mantle mixing characteristics．The mafic magma was derived from partial melting of the mantle wedge which was metasomatized by hydrous fluids from subduction slab dehydration. Then the quartz diorite originated from crystallization differentiation of mantle source magma，and the granodiorite originated from crust sourced magma mixing some mantle sourced magma．Connecting with the predecessors research results，it can be supposed that the petrogenesis of the Heimahe granitic pluton may be related to the southward subduction of Zongwulong Oceanic crust during the early Middle Triassic．

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张永明,裴先治,李佐臣,李瑞保,刘成军,裴磊,陈有炘,陈国超,王盟.2017.青海南山构造带西段黑马河花岗杂岩体锆石U-Pb年代学、地球化学特征及其地质意义[J].地质论评,63(4):1079-1101,[DOI].
ZHANG Yongming, PEI Xianzhi, LI Zuochen, LI Ruibao, LIU Chengjun, PEI Lei, CHEN Youxin, CHEN Guochao, WANG Meng.2017. LA-ICP-MS Zircon U-Pb Dating，Geochemistry and Its Geological Significance of the Heimahe Granitic Pluton in the Western Segment of the Qinghai’nanshan Tectonic Belt[J]. Geological Review,63(4):1079-1101.

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  • 收稿日期:2016-05-18
  • 最后修改日期:2017-04-14
  • 在线发布日期: 2017-07-13
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