INVESTIGADORES
GUERESCHI Alina Beatriz
artículos
Título:
El sinforme de la Sierra Blanca: petrología y evolución estructural, Sierra de Comechingones, Córdoba, Argentina
Autor/es:
MARTINO, ROBERTO DONATO; GUERESCHI, ALINA BEATRIZ; GIAMBASTIANI, MAURICIO
Revista:
Revista de la Asociación Geológica Argentina
Editorial:
Asociación Geológica Argentina
Referencias:
Lugar: Buenos Aires; Año: 1997 vol. 52 p. 143 - 156
ISSN:
0004-4822
Resumen:
On the eastern slope of Sierra de Comechingones near Las Caleras, a group of metasediments predominantly composed by calcodolomitic marbles and metapelites, associated with orthogneisses and granitoids, are grouped in three tectonic domains. Marbles and associated gneisses crop out in the uplifted basement wedge of Sierra Blanca, limited by El Saucesito and Viejo Almacén lineaments. A set of antiforms and sinforms dominated by an overturned tight sinform fold with a S3 axial plane oriented N 336º/20º E and an axis N 134º/24º is outlined by marbles. Marbles and gneisses, whose parageneses are Fo + Di + Cal + Dol and Qtz + Pl + Bt + Grt + Sil + Kfs respectively, would have reached granulite facies conditions during the metamorphic peak M2. During this event was developed the main S2 fabric under a strong non-coaxial deformation regime at the ´internal zone´ of an Upper Precambrian collisional orogen.
