Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina

Bechis, Florencia; Giambiagi, Laura; García, Víctor H.; Lanés, Silvia; Cristallini, Ernesto Osvaldo; Tunik, Maísa

doi:10.1016/j.jsg.2010.03.009

Cited by 40 publications

(57 citation statements)

References 24 publications

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“…In the study region, despite that some authors interpret that reactivation of normal faults have occurred in the western sector affecting the Jurassic rocks (Giambiagi et al, 2005aBechis et al, 2010), we have not found supporting evidence indicating major tectonic inversion. Although the Mesozoic normal faults could have constituted weakness zones able to be reactivated during the subsequent compression, we think that the large structural relief at the thick-skinned sector of the Malargüe FTB, where the basement was uplifted almost 5 km from its undeformed position (Fig.…”

Section: Thick-skinned Sector Of the Malargüe Ftbcontrasting

confidence: 92%

“…Specifically in the region of the Malargüe FTB, detailed measurements of minor faults support kinematic models that explain the Late Triassic-Early Jurassic extension (Bechis et al, 2010), while few contributions exists about such mesoscale structures in relation with the Andean compression (Cardozo et al, 2005;. Fracture data at outcrop scale were collected by Turienzo (2008) during field works in the area of the Río Diamante and herein they are described and interpreted in order to understand its relationship with the major structures and the orientation of the associated regional stress field.…”

Section: Analysis Of Fracture Setsmentioning

confidence: 78%

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Cenozoic structural evolution of the Argentinean Andes at 34º40’S: A close relationship between thick and thin-skinned deformation

Turienzo

Dimieri

Frisicale

et al. 2012

andgeo

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ABSTRACT. In the Argentinean side of the Andes at 34°40'S, the Cenozoic Andean orogeny produced the thick-skinned Malargüe fold-and-thrust belt and the easternmost basement uplift of the Cordillera Frontal. Integrating balanced structural cross-sections with previous studies of Cenozoic synorogenic rocks and 40 Ar/ 39 Ar ages of coeval volcanic and subvolcanic rocks, we propose a Miocene to Quaternary sequential structural evolution of this sector of the Andes. Andean deformation in the study area begun around 14.5 Ma with the growth of thick-skinned structures at the western region, formed by large basement wedges that propagated along detachment horizons within the cover generating thin-skinned structures. The development of these genetically linked thick and thin-skinned structures finished with the insertion of a third basement wedge and its associated deformation in cover rocks along the Sosneado thrust, before the extrusion of 10.8 Ma volcanic rocks. These structures imply ~10 km of shortening, representing an important Middle Miocene compressive period (2.7 mm/a). Systems of fractures measured in basement, cover and subvolcanic rocks indicate an E-W direction of compression. A supercritical Coulomb wedge attained after the Middle Miocene deformation, was responsible of new basement-involved faulting into the foreland, the west-dipping Carrizalito thrust. The absence of efficient detachment levels in the cover rocks of the eastern region difficulted the development of large basement wedges and instead important backthrusting occurred in the hangingwall of the Carrizalito thrust. Widespread subvolcanic rocks (10.5 to 5.5 Ma) exposed in this region suggest a close relationship between magmatism and antithetic faulting. With continuing compression, the Carrizalito thrust breaks through to the surface thrusting pre-Jurassic and Mesozoic sequences over Cenozoic rocks although in the southern region it remains as a blind thrust. This different configuration along the strike of the Carrizalito thrust is due to an ENE trending oblique fault. Thick-skinned structures in the eastern sector, that involve ~4 km of shortening, were covered discordantly by horizontal basalts of ~0. RESUMEN. Evolución estructural Cenozoica de los AndesArgentinos a los 34°40'S: una estrecha relación entre deformación de piel fina y piel gruesa. En los Andes Argentinos a los 34°40'S, la orogenia Andina produjo durante el Cenozoico la faja corrida y plegada de Malargüe, de piel gruesa, y hacia el este el levantamiento del basamento en la Cordillera Frontal. Integrando secciones estructurales balanceadas con estudios previos de rocas sinorogénicas terciarias y edades 40 Ar/ 39 Ar de rocas volcánicas y subvolcánicas contemporáneas, proponemos una evolución estructural secuencial desde el Mioceno al Cuaternario para este sector de los Andes. La deformación andina en el área de estudio comenzó alrededor de los 14,5 Ma con el desarrollo de estructuras de piel gruesa en la región occidental, formadas por grandes cuñas de basamento que se pro...

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Section: Thick-skinned Sector Of the Malargüe Ftbcontrasting

confidence: 92%

Section: Analysis Of Fracture Setsmentioning

confidence: 78%

Cenozoic structural evolution of the Argentinean Andes at 34º40’S: A close relationship between thick and thin-skinned deformation

Turienzo

Dimieri

Frisicale

et al. 2012

andgeo

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“…The lines of evidence for the extensional-setting model in present-day Argentinean territory are in summary: a. the existence of huge volume of acid magmatism genetically related to crustal anatexis, represented by the Choiyoi group, a unit that is located along the eastern flank of the Andes, between 20° and 40°S Sato, 1990, 1995;Llambías et al, 1993Llambías et al, , 2003; b. the generation of basaltic flows of alkaline or within plate geochemical signature, genetically related to the last stage of the Choiyoi Group magmatism (Ramos and Kay, 1991), c. the sedimentological and structural framework of rift activity in the Cuyo and Ichigualasto basins, both of Lower to Upper Triassic age (Spalletti, 1997;Spalletti et al, 2006;Giambiagi and Martínez, 2008;Giambiagi et al, 2011) and d) the petrological, sedimentological and structural framework of rift, and subductionrelated, activity for the Uppermost Triassic-Lower Jurassic Pre-Cuyo group of the Neuquén Basin in Argentina (Spalletti, 1997;Franzese and Spalletti, 2001;Bechis et al, 2010;D'Elia et al, 2012a, b).…”

Section: Tectonic Framework For the Triassic Magmatism: Passive Or Acmentioning

confidence: 99%

Geochemistry of Permian to Triassic igneous rocks from northern Chile (28º-30º15’S): Implications on the dynamics of the proto-Andean margin.

Coloma¹,

Valin²,

Oliveros³

et al. 2017

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“…1). Triassic-Jurassic synrift deposits consist of more than 2,000 m of fluvio-lacustrine and fan-delta deposits in the northern sector, and over 4,000 m of volcanic and volcaniclastic rocks in the Neuquén embayment (Gulisano and Gutiérrez-Pleimling, 1994;Manceda and Figueroa, 1995;Giambiagi et al, 2009;Bechis et al, 2010). Marine rift sequences unconformably overlay these continental deposits (Legarreta and Uliana, 1996;Lanés et al, 2008).…”

Section: Geologic Setting: the Neuquén Basinmentioning

confidence: 99%

Late Cretaceous Uplift in the Malargüe fold-and-thrust belt (35ºS), southern Central Andes of Argentina and Chile

Mescua

Giambiagi

Ramos

2013

andgeo

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ABSTRACT. The Cordillera de los Andes is the typical example of a subduction-related orogen. Its present topography is the result of post-Miocene uplift, however, Andean compressional deformation and uplift started in the Late Cretaceous, as increasingly recognized in different sectors of the mountain belt. We present evidences of a Late Cretaceous event of compressional deformation in the southern Central Andes (35ºS), reflected in syn-orogenic foreland basin deposits assigned to the Neuquén Group in Argentina and the Brownish-Red Clastic Unit in Chile. Comparison of the facies of these units allows us to recognize a sector proximal to the Late Cretaceous orogenic front, a distal sector with sediment provenance from the forebulge and a western sector where the sediments where deposited within the Late Cretaceous mountain belt. On this basis, we assign the orogenic front to an inverted Jurassic normal fault, the Río del Cobre fault, and reconstruct the structure of the easternmost Late Cretaceous Andes at this latitude. The change in the location of the orogenic front north and south of 35ºS allows us to recognize a long-lived change in behavior in Andean evolution in this sector, which correlates with a change in the shape and the deposits of Mesozoic Neuquén basin. RESUMEN. Levantamiento Cretácico Tardío en la faja plegada y corrida de Malargüe (35ºS), Andes Centrales del sur, Argentina y Chile. La Cordillera de los Andes es el ejemplo típico de un orógeno asociado a subducción. Si bien su topografía actual es el resultado del levantamiento posterior al Mioceno, la deformación y el levantamiento ándicos comenzaron a partir del Cretácico Tardío, como se reconoce actualmente en diversos sectores de la faja montañosa. En este trabajo se presentan evidencias de un evento de deformación compresiva durante el Cretácico Tardío en los Andes Centrales del sur (35ºS) reconocido a partir de los depósitos sinorogénicos asociados, que se asignan al Grupo Neuquén en Argentina y la ʻUnidad Clástica Café-Rojiza' (BRCU) en Chile. Mediante las variaciones de facies en estos depósitos se pueden reconocer un sector proximal cercano al frente orogénico Cretácico Tardío, un sector distal con aporte desde el dorso periférico, y un sector occidental en el que los depósitos se produjeron dentro del cordón montañoso. De esta manera, se puede ubicar el frente orogénico Cretácico Tardío, el que asignamos a la inversión tectónica de una falla normal jurásica, la falla Río del Cobre. El cambio en la ubicación del frente orogénico Cretácico al norte y sur de 35ºS permite reconocer a este sector como un límite entre sectores con diferencias en su evolución andina, que se interpreta como heredado de la evolución de la cuenca Neuquina.

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Kinematic analysis of a transtensional fault system: The Atuel depocenter of the Neuquén basin, southern Central Andes, Argentina

Cited by 40 publications

References 24 publications

Cenozoic structural evolution of the Argentinean Andes at 34º40’S: A close relationship between thick and thin-skinned deformation

Cenozoic structural evolution of the Argentinean Andes at 34º40’S: A close relationship between thick and thin-skinned deformation

Geochemistry of Permian to Triassic igneous rocks from northern Chile (28º-30º15’S): Implications on the dynamics of the proto-Andean margin.

Late Cretaceous Uplift in the Malargüe fold-and-thrust belt (35ºS), southern Central Andes of Argentina and Chile

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