Petrogenetic grid for ultrahigh-pressure metamorphism in the model system CaO-MgO-SiO2-CO2-H2O

Yoshihide Ogasawara, J. G. Liou, R. Y. Zhang

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17 Citations (Scopus)

Abstract

Petrogenetic grids for ultrahigh-pressure (UHP) metamorphism were calculated at different XCO2 conditions in the model system CaO-MgO-SiO2-CO2-H2O involving coesite (Co), diopside (Di), dolomite (Do), enstatite (En), forsterite (Fo), magnesite (Ms), quartz (Qz), talc (Tc), tremolite (Tr) using a published internally consistent thermodynamic data set. Two P-T grids at XCO2 = 0.01 and 0.5 are described. The effect of XCO2 on the stability of coesite-dolomite-magnesite, diopside-enstatite-magnesite, diopside-talc assemblages is examined and the occurrence of coesite-dolomite, magnesite-bearing and talc-bearing assemblages in the Dabie UHP rocks are interpreted by employing the calculated P-T grids. -from Authors

Original languageEnglish
Pages (from-to)240-253
Number of pages14
JournalIsland Arc
Volume4
Issue number4
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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