Significance of iron-rich silicates in the Mezö-Madaras chondrite

Significance of iron-rich silicates in the Mezö-Madaras chondrite

by Robert T. Dodd

Book 254 of Environmental Research Papers --

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Several chondrules in the Mezo-Madaras chondrite contain the disequilibrium mineral assemblage: ferrous olivine--magnesian pyroxene--merrihueite (approximately (K> or = Na)2 (Fe> or = Mg)5 Si12O30) plus or minus metallic nickel-iron. The ferrous silicates in this assemblage were probably formed by introduction of FeO into an earlier igneous assemblage which consisted or enstatite or clinoenstatite, a magnesian analogue of merrihueite, and silica. Textural and chemical evidence indicate that this alteration of the chondrules took place before they were incorporated in the chondrite. (Author).

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