Abstract
Microprobe analyses of mesostasis glass and phyllosilicate (“spinach”) in a variety of chondrules and aggregates from the C2 chondrites Murchison, Essebi, and Renazzo suggest that a two-stage alteration process acted on glass to produce the current range of spinach compositions. The first stage was short, but active, coinciding both with a period of vigorous gardening of the C2 parent regolith and with the pervasive alteration that modified the proportion of matrix phyllosilicates in C2 meteorites. During this stage, mesostasis glass was hydrated and was Mg-enriched by limited reaction with chondrule and aggregate phenocrysts. The second alteration stage involved slow but extensive reactions between mesostasis material and altered matrix, resulting in a field of Fe-enriched spinach compositions that is distinctive for each meteorite.
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