Tectonic repetitions of the Early Cretaceous Agrio Formation in the Chos Malal fold-and-thrust belt, Neuquén Basin, Argentina: Geometry, kinematics and structural implications for Andean building

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

doi:10.1016/j.jsames.2014.04.004

Cited by 24 publications

(24 citation statements)

References 39 publications

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“…La Primavera Formation, exposed on the eastern slopes of the Cordillera del Viento (Figures b and ), is a volcaniclastic sequence with interbedded marine deposits containing invertebrate fossils (Leanza et al, ). It is one of the oldest stratigraphic units deposited during this Early Jurassic rifting stage in the Neuquén Basin and has been also recognized throughout the study area in seismic‐reflection data (Sánchez et al, ; Turienzo et al, ). During the Early to Middle Jurassic, subduction initiated along the western Gondwana margin (Franzese et al, ) and by the Late Jurassic the Andean magmatic arc was fully developed (Howell et al, ).…”

Section: Geological Settingmentioning

confidence: 87%

Retracted: Middle Miocene to Early Pliocene Contraction in the Chos Malal Fold‐and‐Thrust Belt (Neuquén Basin, Argentina): Insights From Structural Analysis and Apatite Fission‐Tracks Thermochronology

et al. 2017

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In the southern central Andes at 37–38°S latitude, the Chos Malal fold‐and‐thrust belt (FTB), which results from the Late Cretaceous closure of the Neuquén Basin, has generated increasing interest because of its potential for hydrocarbon exploration. Using detailed field mapping, seismic reflection and well data analysis, cross‐section balancing, and detrital apatite fission‐track thermochronology from 18 samples distributed along the FTB, we bring new quantitative constraints on the chronology of the Neogene structural development of the Chos Malal FTB. Our data set reveals that extensive tectonically driven exhumation through basement‐involved thrusting occurred at ~15–7 Ma in both the inner and outer sectors of the FTB. This age range is corroborated by indirect dating of the Chos Malal Formation, a syntectonic unit also deformed after deposition, which we find was deposited after 7.2 Ma ± 1.6/2.0 Ma, an age much younger than the Miocene age it was previously assigned. We document for the first time an early Pliocene rapid cooling stage that was ongoing ~5.5 to 5.1 Ma ago in the interior of the orogenic wedge, which we attribute to out‐of‐sequence thrusting along basement‐involved thrust faults bounding the Cordillera del Viento, driving the surface uplift of this prominent topographic feature. Finally, our sequential reconstruction of the thick‐ and thin‐skinned structures of the Chos Malal FTB shows that most of the horizontal shortening was accommodated after the middle Miocene, which we thus consider as being the main phase of orogenic building in this sector of the Andes.

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Section: Geological Settingmentioning

confidence: 87%

Retracted: Middle Miocene to Early Pliocene Contraction in the Chos Malal Fold‐and‐Thrust Belt (Neuquén Basin, Argentina): Insights From Structural Analysis and Apatite Fission‐Tracks Thermochronology

et al. 2017

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“…Upper‐crustal retroarc structures have accommodated orogen‐perpendicular (east‐west) shortening, with significant along‐strike (north‐south) variations (Figure ). Estimates of total crustal shortening, although hindered by magmatic overprinting and volcanic/sedimentary cover rocks in the arc and hinterland, attain a maximum of 300–350 km in the central Andes (at 15–25°S), 20–50 km at the transition from the central to southern Andes (33–35°S), and <20 km in the southern Andes of northern Patagonia (35–45°S) (Allmendinger, ; Allmendinger et al, ; Anderson et al, ; Eichelberger et al, ; Kley et al, ; Kley & Monaldi, ; McQuarrie, ; McQuarrie et al, ; Oncken et al, ; Perez et al, ; Roeder, ; Roeder & Chamberlain, ; Sánchez et al, ; Sheffels, ; Turienzo et al, ; von Gosen, ; Zapata & Allmendinger, ). Synorogenic sedimentary basins are preserved on both orogenic flanks, including forearc basins controlled by diverse structures and retroarc hinterland and foreland basins mostly associated with shortening‐induced topographic loading and lithospheric flexure (Horton, , , ; Horton & DeCelles, ; Jordan, ; Jordan et al, ; Watts et al, ).…”

Section: Geologic Backgroundmentioning

confidence: 99%

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

2018

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Construction of the Andes has been governed largely by fluctuating contractional, neutral, and extensional tectonic regimes during differing degrees of mechanical coupling along the convergent plate boundary. These three contrasting regimes are likely regulated by geodynamic variations in absolute trenchward motion of South America and episodic regional shifts in the geometry of the subducting oceanic slab. Alternations among these three modes are revealed in syntheses of Mesozoic‐Cenozoic crustal deformation, basin evolution, and arc magmatism along orogen‐perpendicular transects across the central and southern Andes at 23°S, 35°S, and 43°S. Despite considerable along‐strike dissimilarities in the magnitude of deformation, a comparable tectonic regime typified the early Andean history, as defined by a transition from Late Jurassic‐Early Cretaceous postrift thermal subsidence to Late Cretaceous retroarc shortening. A key contradiction is expressed for the late middle Eocene to earliest Miocene, when neutral to extensional conditions affected retroarc to forearc regions, except in parts of the central Andes, which experienced retroarc shortening with only localized forearc extension. This mixed‐mode scenario during Paleogene time may reflect decoupling along the plate boundary (possibly during slab rollback within a retreating subduction system) in which widespread stasis or low‐magnitude extension dominated the southern Andes but was inhibited in the strongly shortened central Andes at 15–25°S where shallow subduction and/or high topography boosted plate coupling. Comparable temporal and spatial shifts in tectonic regime along the Andes and other convergent margins can be related to variable degrees of coupling during first‐order plate‐scale changes in convergence and second‐order regional cycles of slab shallowing and steepening.

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“…• Malargüe fold-and-thrust belt: [252][253][254][255][256][257][258] • Chos Malal fold-and-thrust belt: [259,260] • Agrio fold-and-thrust belt: [257,261] For this paper the Malargüe fold-and-thrust belt was chosen because it clearly shows the interaction between basin inversion and the involvement of the crystalline basement in compression. The structure of the entire Andean chain along latitude 31 • S is discussed in Section 2.4 (see Figure 12).…”

Section: Malargüe Fold-and-thrust Belt In the Andesmentioning

confidence: 99%

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Pfiffner

2017

Geosciences

119

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This paper gives an overview of the large-scale tectonic styles encountered in orogens worldwide. Thin-skinned and thick-skinned tectonics represent two end member styles recognized in mountain ranges. Both styles are encountered in former passive margins of continental plates. Thick-skinned style including the entire crust and possibly the lithospheric mantle are associated with intracontinental contraction. Delamination of subducting continental crust and horizontal protrusion of upper plate crust into the opening gap occurs in the terminal stage of continent-continent collision. Continental crust thinned prior to contraction is likely to develop relatively thin thrust sheets of crystalline basement. A true thin-skinned type requires a detachment layer of sufficient thickness. Thickness of the décollement layer as well as the mechanical contrast between décollement layer and detached cover control the style of folding and thrusting within the detached cover units. In subduction-related orogens, thin-and thick-skinned deformation may occur several hundreds of kilometers from the plate contact zone. Basin inversion resulting from horizontal contraction may lead to the formation of basement uplifts by the combined reactivation of pre-existing normal faults and initiation of new reverse faults. In most orogens thick-skinned and thin-skinned structures both occur and evolve with a pattern where nappe stacking propagates outward and downward.

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Tectonic repetitions of the Early Cretaceous Agrio Formation in the Chos Malal fold-and-thrust belt, Neuquén Basin, Argentina: Geometry, kinematics and structural implications for Andean building

Cited by 24 publications

References 39 publications

Retracted: Middle Miocene to Early Pliocene Contraction in the Chos Malal Fold‐and‐Thrust Belt (Neuquén Basin, Argentina): Insights From Structural Analysis and Apatite Fission‐Tracks Thermochronology

Retracted: Middle Miocene to Early Pliocene Contraction in the Chos Malal Fold‐and‐Thrust Belt (Neuquén Basin, Argentina): Insights From Structural Analysis and Apatite Fission‐Tracks Thermochronology

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

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