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- W1986621058 abstract "A zoned kelyphite after garnet, from a garnet pyroxenite layer, the Ronda peridotite. Spain, has been studied and the mechanism of kelyphite formation is discussed. The kelyphite is an extremely finegrained symplectitic mixture of orthopyroxene, spinel, olivine, plagioclase, and ilmenite. It is concentrically zoned, forming three mineralogical subzones. They are, from adjacent to a garnet grain toward a clinopyroxene side, zone I (orthopyroxene+spinel + plagioclase), zone II (olivine+spinel+plagioclase), and zone III (olivine+plagioclase). The analysis of phase equilibria shows that this mineralogical zonation can develop stably as a result of the presence of chemical potential gradients. On the basis of microprobe chemical analyses for each zone, material transfer across the zone that took place during the kelyphitization was quantitatively evaluated, and by locating the initial grain boundary between garnet and clinopyroxene grains and by writing metasomatic reactions for each zone boundary, a simple dynamic model for the kelyphite formation is proposed. The kelyphite formation probably took place when the host Ronda peridotite ascended from the upper mantle to the crust. It involved a co-operative breakdown of the garnet and aluminous clinopyroxene, being accompanied by a material transfer across the zone boundaries. By examining the Fe-Mg partitioning between olivine, spinel, and orthopyroxene in the kelyphite and by examining the Al content of the orthopyroxene, an attainment of local equilibrium has been confirmed, and the physical conditions of the kelyphite formation have been estimated to be 620–700°C and 4–8 kbar." @default.
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- W1986621058 date "1994-02-01" @default.
- W1986621058 modified "2023-09-23" @default.
- W1986621058 title "Material Transfer and Local Equilibria in a Zoned Kelyphite from a Garnet Pyroxenite, Ronda, Spain" @default.
- W1986621058 doi "https://doi.org/10.1093/petrology/35.1.271" @default.
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