Discovery of coesite in the North Qaidam early Paleozoic ultrahigh-high pressure (UHP-HP) metamorphic belt, NW China

J. Yang, S. Song, Z. Xu, C. Wu, R. Shi, J. Zhang, H. Li, Y. Wan, Y. Liu, H. Qiu, F. Liu, S. Maruyama

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    81 Citations (Scopus)

    Abstract

    Coesite was discovered as inclusions in zircon within gneiss associated with a large eclogite body in the North Belt of the Qaidam UHP terrane. Some graphite inclusions also found. This finding confirms our previous suggestion that the North Qaidam UHP terrane was recrystallized at p below the diamond stability field based on several lines of evidence such as polycrystalline K-feldspar and quartz inclusions in eclogitic garnet, quartz lamellae in omphacite and p-t estimates for both eclogite and garnet peridotite. The occurrence of coesite inclusions in zircon suggests in-situ UHP metamorphism. This UHP terrane, along with the Altun eclogite of 504 Ma, and those to the east of Qilian Mts, in the North Qingling, Tongbai and North Dabie regions, recorded the Early Paleozoic collision between the Sino-Korean and Yangtze plates. This UHP belt could extend to further west to the similar age Kokchetav UHP belt in Kazakastan.

    Original languageEnglish
    Pages (from-to)177-179
    Number of pages3
    JournalActa Geologica Sinica
    Volume75
    Issue number2
    Publication statusPublished - 2001

    Keywords

    • Coesite
    • Dulan
    • Eclogite
    • North margin of Qaidam basin
    • UHPM belt

    ASJC Scopus subject areas

    • Geology

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