Abstract
Prehnite-pumpellyite facies metamorphism in the Cenozoic Abanico Formation, Andes of central Chile (33°50'S): chemical and scale controls on mineral assemblages, reaction progress and the equilibrium state
Highlights
Very low-grade metamorphism, traditionally considered as developed as a consequence of burial (Coombs, 1961) or diastathermal (Robinson, 1987) processes, is characterized by being a nondeformative process where recrystallization is only partial and occurs at low temperatures (
The lower values of this parameter are accompanied by a decrease of the non-interlayered cations (NIC) content down to 18.6 and an increase of interlayered cations (IC) and Si contents, up to 0.7 and 7.5, respectively
In order to deal in depth with the low-grade metamorphism affecting the Abanico Formation, we have carried out a detailed petrographic and chemical study of its secondary mineralogy throughout a continuous section of this formation exposed in two localities: the El Volcán and Rodeo de los Bueyes areas
Summary
Very low-grade metamorphism, traditionally considered as developed as a consequence of burial (Coombs, 1961) or diastathermal (Robinson, 1987) processes, is characterized by being a nondeformative process where recrystallization is only partial and occurs at low temperatures (
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