Almandine-rich garnet from near Collobrieres, southern France, and its petrological significance

A. B. Woodland, G. Droop, H. S.C. O'Neill

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Garnets from metamorphosed ironstones from near Collobrieres, southern France, are some of the most almandine-rich garnets yet reported. They occur in a quartz-free assemblage, containing fayalite, grunerite, magnetite, and apatite. Peak metamorphic conditions are estimated to be 630 ± 60°C and 5 ± 2 kbar. The occurrence of fayalite indicates relatively reduced metamorphic conditions, below FMQ. The presence of Fe3+ in the garnets under such conditions suggests similar or larger amounts of Fe3+ should be present in aluminous garnets in medium and high grade metamorphic rocks. -from Authors

Original languageEnglish
Pages (from-to)187-194
Number of pages8
JournalEuropean Journal of Mineralogy
Issue number1
Publication statusPublished - 1995
Externally publishedYes

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