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首页> 外文期刊>Geological Society of America Bulletin >Miocene high-temperature leucogranite magmatism in the Himalayan orogen
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Miocene high-temperature leucogranite magmatism in the Himalayan orogen

机译：Miocene高温leucogranite Magmatism在喜马拉雅山orenogen

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摘要

Himalayan leucogranites of Cenozoic age are generally attributed to partial melting of metasedimentary rocks at low temperatures of <770 degrees C. It is unknown what the spatial distribution and characteristics of high-temperature (>800 degrees C) leucogranites are in the Himalayan orogen. The present study reports the occurrence of such leucogranites in the collisional orogen. We use the Ti-in-zircon thermometry in combination with the thermodynamically calibrated relationships of T-alpha(SiO2)-alpha(TiO2) to retrieve crystallization temperatures of Miocene (ca. 17 Ma) two-mica granites from Yalaxiangbo, in the eastern Himalaya, SE Tibet. The results give the maximum temperature as high as similar to 850 degrees C for granite crystallization, providing a significant constraint on the nature of thermal sources. Phase equilibrium modeling using metasedimentary rocks as the source rocks indicates that felsic melts produced at similar to 850 degrees C and 6-10 kbar can best match the target leucogranites in lithochemistry. In this regard, the anatectic temperatures previously obtained for the production of Himalayan leucogranites would probably be underestimated to some extent. Such high temperatures are difficult to explain purely by the internal heating of the thickened orogenic crust. Instead, they require an extra heat source, which would probably be provided by upwelling of asthenospheric mantle subsequent to thinning of the orogenic lithospheric mantle by foundering along the convergent plate boundary. Therefore, the Himalayan leucogranites of Miocene age would be derived from partial melting of the metasedimentary rocks in the post-collisional stage.
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    Gao Peng; Zheng Yong-Fei; Mayne Matthew Jason; Zhao Zi-Fu;

  • 作者单位

    Univ Sci &

    Technol China Chinese Acad Sci Sch Earth &

    Space Sci Key Lab Crust Mantle Mat &

    Environm Hefei 230026 Peoples R China;

    Univ Sci &

    Technol China Chinese Acad Sci Sch Earth &

    Space Sci Key Lab Crust Mantle Mat &

    Environm Hefei 230026 Peoples R China;

    Univ Stellenbosch Dept Earth Sci ZA-7602 Matieland South Africa;

    Univ Sci &

    Technol China Chinese Acad Sci Sch Earth &

    Space Sci Key Lab Crust Mantle Mat &

    Environm Hefei 230026 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地质学;
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