The Structure of the Southern Central Andes (Chos Malal Fold and Thrust Belt)

Turienzo, Martin Miguel; Sánchez, Natalia Paola; Lebinson, Fernando Oscar; Dimieri, Luis Vicente

doi:10.1007/978-3-319-67774-3_17

Cited by 6 publications

(27 citation statements)

References 39 publications

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“…Interpretation of poor-quality seismic lines in the study area does not show clear evidence of a significant inversion processes. Comparable conclusions arise from subsurface interpretations (Sánchez et al, 2015;Turienzo et al, 2018) and field observations (Sagripanti et al, 2014) in the Chos Malal FTB, where the Late Triassic-Early Jurassic normal faults were only partially inverted and they preserve their extensional character. Many regional cross-sections have been made along the Agrio and Chos Malal fold and thrust belts in the last three decades, analysing the structural style of the deformed regions of the Neuquén Basin (Fig.…”

Section: Structural Models and Variation Of Tectonic Shorteningsmentioning

confidence: 96%

“…3), which comprises an area of 1,742 km 2 (67x26 km). Different orders of folds were distinguished based on their wavelength and the involved units, as it was done in the Chos Malal fold and thrust belt (Kozlowski et al, 1996;Turienzo et al, 2014Turienzo et al, , 2018Sánchez et al, 2015). The thick skinned structures form first order folds, which involve basement rocks and wavelengths of around 8-12 km.…”

Section: Structurementioning

confidence: 99%

“…3 and 10c). Structural studies in surrounding areas highlight the importance of these evaporitic rocks for the tectonic development of the fold and thrust belts (Zapata et al, 1999;Zapata and Folguera, 2005;Zamora Valcarce et al, 2006;Sánchez et al, 2014Sánchez et al, , 2015Turienzo et al, 2014Turienzo et al, , 2018. Huitrín formations favour the formation of several orders of fault-related folds.…”

Section: Kinematic Evolution Of Complex Thin-skinned Structuresmentioning

confidence: 99%

“…Two main modes of deformation were commonly used in this region in order to explain the Andean mountain building: (i) positive inversion of previous normal faults (Vergani et al, 1995;Booth and Coward, 1996;Ramos, 1998;Zapata et al, 1999;Zapata and Folguera, 2005;Zamora Valcarce, 2007;Rojas Vera et al, 2015) and (ii) generation of new thrust systems (Minniti et al, 1986;Nocioni, 1996;Kozlowski et al, 1998;Turienzo et al, 2014Turienzo et al, , 2018Sánchez et al, 2015). Despite both mechanisms probably coexisted during the Andean deformation, their relative importance and their contribution to the observed contraction along the fold and thrust belts is still a matter of debate (i.e., Mescua and Giambiagi, 2012;Dimieri and Turienzo, 2012;Turienzo et al, 2018).…”

Section: Structural Models and Variation Of Tectonic Shorteningsmentioning

confidence: 99%

“…The region of study is located in the Neuquén Basin, which is one of the most important oil producing sedimentary basins of Argentina. In this zone, several works on the stratigraphy and the structure have been conducted because of the scientific and economic interest due to the presence of hydrocarbon deposits (Groeber, 1929(Groeber, , 1946Zöllner and Amos, 1973;Minniti et al, 1986 1 ; Gulisano and Gutiérrez Pleimling, 1995;Vergani et al, 1995;Kozlowski et al, 1998;Zapata et al, 1999;Zapata and Folguera, 2005;Leanza et al, 2006;Zamora Valcarce et al, 2009;Rojas Vera et al, 2015;Turienzo et al, 2014Turienzo et al, , 2018Sánchez et al, 2014Sánchez et al, , 2015.…”

Section: Introductionmentioning

confidence: 99%

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The structure of the northern Agrio fold and thrust belt (37°30’ S), Neuquén Basin, Argentina

Lebinson

Turienzo

Sánchez

et al. 2018

andgeo

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The Agrio fold and thrust belt is a thick-skinned orogenic belt developed since Late Cretaceous in response to the convergence between the Nazca and South American plates. The integration of new structural field data and seismic line interpretation allowed us to create two balanced cross-sections, which help to analyse the geometry of both thick and thin-skinned structures, to calculate the tectonic shortenings and finally to discuss the main mechanisms that produced this fold and thrust belt. The predominantly NNW-SSE structures show varying wavelengths, and can be classified into kilometer-scale first order basement involved structures and smaller second, third and fourth order fault-related folds in cover rocks with shallower detachments. Thick-skinned structures comprise fault-bend folds moving into the sedimentary cover, mainly along Late Jurassic evaporites, which form basement wedges that transfer the deformation to the foreland. Thus, shortenings in both basement and cover rocks must be similar and consequently, by measuring the contraction accounted for thin-skinned structures, is possible to propose a suitable model for the thick skinned deformation. The balanced cross-sections indicate shortenings of 11.2 km (18%) for the northern section and 10.9 km (17.3%) for the southern section. These values are different from the shortenings established by previous works in the region, reflecting differences in the assumed model to explain the basement-involved structures. According to our interpretation, the structural evolution of this fold and thrust belt was controlled by major basement-involved thrust systems with subordinate influence of inversion along pre-existing normal faults during the Andean compression.

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Section: Structural Models and Variation Of Tectonic Shorteningsmentioning

confidence: 96%

Section: Structurementioning

confidence: 99%

Section: Kinematic Evolution Of Complex Thin-skinned Structuresmentioning

confidence: 99%

Section: Structural Models and Variation Of Tectonic Shorteningsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The structure of the northern Agrio fold and thrust belt (37°30’ S), Neuquén Basin, Argentina

Lebinson

Turienzo

Sánchez

et al. 2018

andgeo

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Structural and Thermochronological Constraints on the Exhumation of the Chos Malal Fold and Thrust Belt (~37° S)

Sánchez

Turienzo

Coutand

et al. 2020

Opening and Closure of the Neuquén Basin in the Southern Andes

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New contributions to the palaeoenvironmental framework of the Los Molles Formation (Early-to-Middle Jurassic), Neuquén Basin, based on palynological data

Olivera

Martínez

Zavala

et al. 2020

Facies

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Being the main oil-bearing basin of Argentina, the Neuquén Basin contains a well-documented stratigraphic record of continental and marine sedimentation during the Jurassic and Cretaceous in the western margin of Gondwana. Marine sedimentation started in the Early Jurassic with the deposition of the offshore to prodelta shales of the Los Molles Formation, the basal unit of the Cuyo Group. A palynological study of outcrop samples of the Los Molles Formation at two localities, Puente Picún Leufú, southern Neuquén Basin, and Cordillera del Viento, central basin area, is presented. The palynological evidence allows inferring two different palaeoceanographic contexts during the deposition of the Los Molles Fm. At Puente Picún Leufú and the lower part of the Cordillera del Viento localities, the record of acritarchs and prasinophytes suggests a stratified water column, suboxic-to-anoxic bottom conditions, and a reduced salinity within the photic zone, associated with a marginal marine environment under restricted oceanic circulation. These conditions would have last at least until the Early Bajocian. Conversely, at the middle and mainly the upper part of Cordillera del Viento locality, the predominance of dinocysts in the assemblages indicates a hydrographically unstable shelf (non-stratified water mass column) with welloxygenated bottom waters developed under open-marine settings with non-restricted oceanic circulation. The abundance and diversity of dinocyst assemblages are comparable with those observed in the Late Callovian Lotena Formation. These evidences suggest an open oceanic circulation due to the establishment of different seaways in the Neuquén Basin, during the final accumulation of the Los Molles Formation (Early Callovian).

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The Structure of the Southern Central Andes (Chos Malal Fold and Thrust Belt)

Cited by 6 publications

References 39 publications

The structure of the northern Agrio fold and thrust belt (37°30’ S), Neuquén Basin, Argentina

The structure of the northern Agrio fold and thrust belt (37°30’ S), Neuquén Basin, Argentina

Structural and Thermochronological Constraints on the Exhumation of the Chos Malal Fold and Thrust Belt (~37° S)

New contributions to the palaeoenvironmental framework of the Los Molles Formation (Early-to-Middle Jurassic), Neuquén Basin, based on palynological data

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