Los pliegues no cilíndricos de Sagrada Familia y su significado en la evolución deformacional del Macizo de San Carlos, Sierras de Córdoba, Argentina

MARTINO, ROBERTO DONATO; GUERESCHI, ALINA BEATRIZ; SFRAGULLA, JORGE

Revista de la Asociación Geológica Argentina

Asociación Geológica Argentina

Lugar: Buenos Aires; Año: 1999 vol. 54 p. 139 - 151

0004-4822

New structural evidences represented by strong non-cilyndrical folding (sheath, tubular, oblique and intrafolial refolded folds) developed in marbles and calcsilicate gneisses intercalated with metatexites and diatexites point out a high non-coaxial deformation superimposed to the main foliation S2 and allows to simplify D2 and D3 deformations events proposed previously. D2 event would represent a period of crustal thickening with thrusting and penetrative high strain produced by tectonic collision. The general movements deduced from stretching lineations and scarce kinematic indicators show top to SW movements. This kinematic is consistent with the sense of increasing metamorphic grade toward the East because of stacking and inversion produced by thrusting that placed high grade rocks over lower grade ones. D3 event is considered a decompression probably associated to an extensional tectonic that would have produced a weak deformation represented by shear bands perpendicular and parallel to the main foliation S2. This extensional phenomenon would have yield an isostatic exhumation deduced from the decompression textures found in metapelites and marbles and represented by delicate preserved coronas.