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首页> 外文期刊>Geological Society of America Bulletin >Petrological, geochronological, and geochemical potential accounting for continental subduction and exhumation: A case study of felsic granulites from South Altyn Tagh, northwestern China
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Petrological, geochronological, and geochemical potential accounting for continental subduction and exhumation: A case study of felsic granulites from South Altyn Tagh, northwestern China

机译：大陆郊区和挖掘地球化学潜在核算 - 中国南方南阿莱恩塔赫术的肠粒子案例研究

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摘要

Deciphering the formation and geodynamic evolution of high-pressure (HP) granulites in a collisional orogeny can provide crucial constraints on the geodynamic evolution of subduction-exhumation. To fully exploit the geodynamic potential of metamorphic rocks, it is necessary to constrain the metamorphic ages, although it is difficult to link zircon and monazite ages to metamorphic evolution. A good case study for understanding these geodynamic processes is felsic granulites in the Bashiwake area, South Altyn Tagh. Petrographic observations suggest that the studied felsic granulites have suffered multi-stage metamorphism, and the distinct metamorphic events were documented by compositional zoning and high Y + heavy rare earth element (HREE) concentrations in the large garnet porphyroblast. Zircon U-Pb dating yielded two major age clusters: one age cluster at ca. 900 Ma represents the age of the protolith for the felsic granulite, and another age cluster at ca. 500 Ma represents the post-UHT (ultrahigh temperature) stage based on the rare earth element distribution coefficients between zircon and garnet. Meanwhile, in situ monazites U-Pb dating yielded a weighted mean Pb-206/U-238 age of 482 +/- 3.5 Ma, and the monazite U-Pb age was interpreted to be in agreement with the metamorphic zircon rims data, which together with zircon recorded the cooling time after the UHT stage. Whole-rock major and trace elements as well as Sr-Nd isotopes suggest that the protolith of the felsic granulite derived from partial melting of ancient crustal materials with the addition of mantle materials. Integrating these results along with previous studies, we propose that the felsic granulites metamorphosed from the Neoproterozoic granitic rocks, and the granitic rocks with associated mafic-ultramafic rocks suffered a common high-pressure-ultrahigh temperature (HP-UHT) metamorphism and subsequent granulite-facies metamorphism. A tentative model of subduction-relamination was proposed for the geodynamic evolution of the Bashiwake unit, South Altyn Tagh.
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  • 作者

    Li Yunshuai; Zhang Jianxin; Yu Shengyao; Li Yanguang; Guo Hu; Zhang Jian; Fu Changlei; Cao Hui; Jin Mengqi; Cai Zhihui;

  • 作者单位

    Tianjin Univ Inst Surface Earth Syst Sci Tianjin 300072 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Minist Land &

    Resources Key Lab Deep Earth Dynam Beijing 100037 Peoples R China;

    Ocean Univ China Minist Educ China Key Lab Submarine Geosci &

    Prospecting Tech Qingdao 266100 Peoples R China;

    China Geol Survey Xian Ctr Geol Survey MLR Key Lab Study Focused Magmatism &

    Giant Ore D Xian 710054 Peoples R China;

    China Geol Survey Tianjin Ctr Geol Survey Tianjin 300170 Peoples R China;

    China Geol Survey Tianjin Ctr Geol Survey Tianjin 300170 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Minist Land &

    Resources Key Lab Deep Earth Dynam Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Minist Land &

    Resources Key Lab Deep Earth Dynam Beijing 100037 Peoples R China;

    China Geol Survey Xian Ctr Geol Survey MLR Key Lab Study Focused Magmatism &

    Giant Ore D Xian 710054 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Minist Land &

    Resources Key Lab Deep Earth Dynam Beijing 100037 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地质学;
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