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CONICET Digital
Article . 2014
License: CC BY NC SA
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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

Authors: Sánchez, Natalia Paola; Turienzo, Martin Miguel; Dimieri, Luis Vicente; Araujo, Vanesa Soledad; Lebinson, Fernando Oscar;

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

Abstract

La faja corrida y plegada de Chos Malal se localiza al noroeste de la provincia de Neuquén e involucra más de 4.500 metros de sedimentos los cuales fueron depositados en la cuenca Neuquina y posteriormente deformados durante la orogenia Andina. En base a un detallado trabajo de campo se reconstruyó la geometría de las estructuras a lo largo de un perfil E-O en el cual se diferencian dos sectores: uno con la participación del basamento en la deformación y otro de deformación de la cubierta sedimentaria. La cordillera del Viento es una gran cuña que involucra el basamento paleozoico y a los Grupos Cuyo y Lotena, hasta alcanzar los niveles de yeso de la Formación Auquilco, los cuales constituyen el primer nivel de despegue. Este despegue, ubicado en un nivel más profundo que lo propuesto por otros autores, se evidencia por el cabalgamiento de parte de la Formación Tordillo sobre la Formación Vaca Muerta a través del retrocorrimiento El Alamito. Hacia el este de la cordillera del Viento, se reconocen en el perfil estructural cinco anticlinales, interpretados como pliegues por flexión y propagación de falla, con vergencia predominante hacia el este y subsidiaria hacia el oeste, los cuales presentan frecuentemente sus limbos frontales invertidos. Los anticlinales de mayor amplitud involucran a la Formación Tordillo y tienen como nivel de despegue las evaporitas de la Formación Auquilco. La restitución de las estructuras desarrolladas en la cubierta sedimentaria permitió calcular un acortamiento de 10 km (26%).

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 %).

Fil: Lebinson, Fernando Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina

Fil: Turienzo, Martin Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina

Fil: Sánchez, Natalia Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina

Fil: Araujo, Vanesa Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina

Fil: Dimieri, Luis Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina

Country
Argentina
Keywords

CINEMÁTICA, PLIEGUES POR PROPAGACIÓN Y FLEXION DE FALLA, https://purl.org/becyt/ford/1.5, CORDILLERA DEL VIENTO, https://purl.org/becyt/ford/1, TECTONICA ANDINA

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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