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Revista de la Asociación Geológica Argentina

versión impresa ISSN 0004-4822

Resumen

SANCHEZ, Natalia P et al. Evolución de las estructuras andinas en la faja corrida y plegada de Chos Malal: interacción entre el basamento y la cubierta sedimentaria de la cuenca Neuquina. Rev. Asoc. Geol. Argent. [online]. 2014, vol.71, n.2, pp.233-246. ISSN 0004-4822.

The Chos Malal fold and thrust belt is located in northwestern Neuquén province and includes more than 4,500 meters of sediments that belong to the Neuquén Basin that were deformed during the Andean orogeny. Based in detailed field work, we reconstruct the geometry of the structures along an E-W cross-section which allow us to recognize two different sectors: one with the basement participation in the deformation and the other with deformation in the sedimentary cover. The cordillera del Viento is a huge basement wedge that involves paleozoics rocks and the Lotena and Cuyo Groups and reaches the levels Auquilco Formation, which represents the first significant detachment level in the cover. This detachment, localized on a more deep level than those proposed by other authors, is evidenced by the thrusting of Tordillo over Vaca Muerta Formation along the El Alamito backthrust. To the east of cordillera del Viento, five anticlines are recognized on the structural cross-section. They are interpreted as fault-bend and fault-propagation folds with predominantly vergence toward the east and subsidiary to the west, which have frequently frontals overturned limbs. The anticlines of greater amplitude involve the Tordillo Formation and have a detachment level along the evaporites of the Auquilco Formation. The restitution of the structures developed in the sedimentary cover allowed us to calculate of 10 km of shortening (26 %).

Palabras clave : Tectónica andina; Cinemática; Cordillera del Viento; Pliegues por propagación y flexión de falla.

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