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• W2037607911 abstract "In the El Volcan and Rodeo de los Bueyes areas, Andean Principal Cordillera (east of Santiago; 33o50'S), an Upper Oligocene-Lower Miocene volcanic series belonging to the Abanico Formation (Late Eocene-Early Miocene) is exposed. The rock successions outcropping in both areas, ca. 3,300 m total thickness, have been affected by very low-grade, non-deformative metamorphism in the prehnite-pumpellyite facies. This is represented by the widespread development of secondary mineral assemblages composed of epidote, mixed-layer chlorite-smectite, albite, quartz, white mica, and titanite. These mineral assemblages also contain pumpellyite, prehnite or prehnite+actinolite in a few samples. Chemical characteristics, such as low compositional variability of mixed-layer chlorite-smectite and actino- lite independent from the metadomain where these phases are hosted, along with a high proportion of chlorite layers in the former, suggest that these phases closely represent the whole rock effective bulk composition. On the contrary, pumpellyite compositions show a higher variability and a strong metadomain control evidencing its lower equilibration kinetics and leaving only those that grow in the rock matrix as the more closely representative of a whole rock effective bulk compositional control. Mineral assemblages from both areas show evidence of having been formed during the same metamorphic event where reactions have ocurred equivalently between them. However, local differences in chemical variables controlling this process are recognizable. A higher CO 2 concentration in the fluids during the metamorphism in the El Volcan area than in the Rodeo de los Bueyes area is suggested by the scarce development of prehnite and the ubiquitous presence of calcite in the metamorphic assemblages of the former. Pressure and temperature of this meta- morphic event have been roughly estimated to be lower than 2-3 kbar and 320oC, respectively." @default.
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• W2037607911 date "2010-01-19" @default.
• W2037607911 modified "2023-09-24" @default.
• W2037607911 title "Metamorfismo de facies prehnita-pumpellyita en la franja oriental de la Formacion Abanico, Cordillera de los Andes de Chile central (33°50'S): controles qumicos y de escala sobre las asociaciones minerales, el progreso de la reaccion y el estado de equili" @default.
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• W2037607911 doi "https://doi.org/10.5027/andgeov37n1-a03" @default.
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