PHLOGOPITE AND COESITE EXSOLUTION FROM SUPER-SILICIC CLINOPYROXENE
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dc.contributor.author | Zhu Y. | |
dc.contributor.author | Ogasawara Y. | |
dc.date.accessioned | 2021-05-24T02:09:21Z | |
dc.date.available | 2021-05-24T02:09:21Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13804728 | |
dc.identifier.citation | International Geology Review, 2002, 44, 9, 831-836 | |
dc.identifier.issn | 0020-6814 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28645 | |
dc.description.abstract | We document the exsolution of phlogopite and coesite/quartz from pre-existing super-silicic clinopyroxene in dolomite marble from the Kokchetav massif, northern Kazakhstan. The exsolution texture was formed by clinopyroxene decomposition through the reaction (3enstatite + 2KalSi2O6)cpx = 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 pro-found subduction could be an important mechanism to transport abundant H2O and potassium into the deep Earth. | |
dc.title | PHLOGOPITE AND COESITE EXSOLUTION FROM SUPER-SILICIC CLINOPYROXENE | |
dc.type | Статья |
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