Original paper
Ferro- and magnesiocarpholite assemblages as record of high-P, low-Γ metamorphism in the Central Alpujarrides, Betic Cordillera (SE Spain)
Azañón, Jose Miguel; Goffé, Bruno
European Journal of Mineralogy Volume 9 Number 5 (1997), p. 1035 - 1052
60 references
published: Sep 24, 1997
manuscript accepted: Mar 25, 1997
manuscript received: Mar 9, 1994
DOI: 10.1127/ejm/9/5/1035
Abstract
Abstract Ferro- and magnesiocarpholite are widespread in the Alpujarride Complex of the Betic Cordillera, in syn-metamorphic quartz veins within highly aluminous Permo-Triassic metapelites. These minerals occur in pyrophyllite-chlorite-, pyrophyllite-chlorite-chloritoid-, kyanite-chlorite- and kyanite-chloritoid-chlorite-bearing assemblages. Aragonite occurs also in the ferrocarpholite-pyrophyllite-chlorite-chloritoid assemblages. These assemblages record Alpine (pre-Miocene) prograde metamorphic evolution towards high-pressure, lowtemperature conditions of the blueschist facies. The P-T formation conditions, calculated in the reduced FMASH system using a thermodynamical data base and actual compositions of chloritoid, carpholite and chlorite, range from 7 kbar, 300-350°C up to 11 kbar and 400-450°C. These values place important constraints on the metamorphic conditions in the Alpujarride Complex, which approach those observed in the underlying Nevado-Filabride Complex
Keywords
ferrocarpholite • magnesiocarpholite • kyanite • high-pressure metamorphism • Betic Chain • Spain