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Filters: Tags: Journal of Petrology (X) > partyWithName: Earley III, Drummond (X)

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The unusual association of cordierite and cummingtonite (� gedrite + chlorite + biotite + ilmenite + plagioclase + quartz) defines a metamorphic facies within aluminous, low-Ca amphibolites from the Proterozoic rocks of the Gold Brick District, east of Gunnison, Colorado. More Fe-rich bulk chemistries in the same facies are characterized by assemblages consisting of cordierite+-gedrite + garnet + chlorite + biotite + ilmenite + plagioclase + quartz, whereas more Mg-rich compositions are characterized by cordierite + anthophyllite + chlorite + biotite + ilmenite � plagioclase + quartz. The assemblage gedrite 4- cummingtonite + chlorite + biotite + ilmenite + plagioclase + quartz was also observed. Coexisting cordierite+...