CICTERRA 20351
CENTRO DE INVESTIGACIONES EN CIENCIAS DE LA TIERRA
Unidad Ejecutora - UE
artículos
Título:
Gneises con grante + antofilita en el basamento mesoproterozoico de lso Andes (Sierra de Maz, La Rioja Argentina): Historia metamórfica y termobarometría.
Autor/es:
SEGOVIA DIAZ EMILIO; CESAR CASQUET; EDGARDO BALDO
Revista:
Geogaceta
Editorial:
Sociedad Geológica de España
Referencias:
Lugar: Madrid; Año: 2011 vol. 50 p. 59 - 62
ISSN:
2173-6545
Resumen:
In the Sierra de Maz (Argentina) high-grade gneisses occurs with an uncommonmineralogical composition: orthoamphibole + garnet, withoutcordierite. These rocks underwent two superimposed metamorphic events:M1, under granulite facies conditions, Grenvillian (ca. 1.2 Ga), and M2, underamphibolites facies conditions, Famatinian (ca. 460 Ma). Pressure and temperatureof the latter event have been calculated by isopleth intersection ona P-T pseudosection in the system NCKFMASH. Resulting values were ca.675 ºC and 9.4 kbar. Moreover pseudosection modelling shows thatcordierite is restricted to lower P conditions. This is the first case that thistype of paragenesis is modelled with modern thermobarometry techniques
