Phlogopite and coesite exsolution from super-silicic clinopyroxene

Yongfeng Zhu*, Yoshihide Ogasawara

*この研究の対応する著者

    研究成果: Article査読

    66 被引用数 (Scopus)

    抄録

    We document the exsolution of phlogopite and coesite/quartz from pre-existing super-silicic clinopyroxene in dolomite marble from the Kokchelav massif, northern Kazakhstan. The exsolution texture was formed by clinopyroxene decomposition through the reaction (3enstatite + 2KAlSi2O6)epx = phlogopite + 4coesite. Phlogopite exsolution must have occurred at pressures less than 8.0 GPa (at 1000°C). where the garnet + super-silicic clinopyroxene + phlogopite assemblage was stable, based on experimentally defined phase relations. Observations described in this report suggest that the precursor clinopyroxene was stable at pressures higher than 8 GPa (>1000°C), implying that the dolomite marble was subducted to mantle depths greater than 240 km. Such profound subduction could be an important mechanism to transport abundant H2O and potassium into the deep Earth.

    本文言語English
    ページ(範囲)831-836
    ページ数6
    ジャーナルInternational Geology Review
    44
    9
    出版ステータスPublished - 2002 9月

    ASJC Scopus subject areas

    • 地質学

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