Early uplift and orogenic deformation in the Neuquén Basin: Constraints on the Andean uplift from U–Pb and Hf isotopic data of detrital zircons

Tunik, Maísa; Folguera, Andrés; Naipauer, Maximiliano; Pimentel, Márcio Martins; Ramos, Víctor A.

doi:10.1016/j.tecto.2010.04.017

Cited by 201 publications

(220 citation statements)

References 43 publications

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“…These units have been related at this locality to synorogenic strata based on the presence of Early Jurassic to Late Cretaceous detrital zircon populations (Fig. 10), which implies coetaneous exhumation of the Andes, where Mesozoic arc roots are exposed (Tunik et al, 2010). Late Cre taceous sequences are unconformably overlaid by Late Oligocene to Lower Miocene sequences of the Palaoco Formation as revealed from seismic and field data (Fig.…”

Section: Description Of Contractional Geometry From Seismic Informationmentioning

confidence: 86%

“…condensed se quences on top of major contractional structures (Bettini et al, 1978;Galarza et al, 2009), together with iii. the occurrence of populations of Early JurassicLate Cretaceous detrital zircons, absent in lower sections, derived from the main Andes to the west, associated with a contemporaneous arcrelated source (Tunik et al, 2010). From Latest Cretaceous to Paleocene times the Andean front was flooded by the first Atlantic transgression.…”

Section: Geological Settingmentioning

confidence: 98%

“…2). The inception of a compressional regime from Late Cretaceous times (Tunik et al, 2010) coincident with a major tectonic plate reorganization (Somoza, 1998;Somoza and Zaffarana, 2008) controlled the Late Cretaceous to Tertiary paleogeography.…”

Section: Geological Settingmentioning

confidence: 99%

“…Note that Upper Oligocene to Miocene volcanic beds are unconformably covering the folded structure. UPb ages of detrital zircons at the Late Cretaceous syncline core on the upper right corner were taken from Tunik et al (2010). High reflectivity of Upper Cretaceous evaporitic units is recognized at the syncline limbs, which im plies a Upper Cretaceous to Neogene sedimentary infill at its core (Fig.…”

Section: Description Of Contractional Geometry From Seismic Informationmentioning

confidence: 99%

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Variable structural controls through time in the Southern Central Andes (~36ºS)

Orts

Folguera

Giménez

et al. 2012

andgeo

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ABSTRACT. The Southern Central Andes at 36ºS have been recognized as an orogenic belt where contraction, ac com modated mainly by basement structures, is associated with the inversion of a Late TriassicEarly Jurassic extensional detachment. Based on a structural crosssection, constrained by field data, 2D seismic and borehole information, and the processing of Bouger anomalies, we propose a polyphasic tectonic evolution. In the westernmost sector, along the axis of the Cordillera, NW to NNW basement structures were inverted, being a first order control in the generation of frontal narrow Ntrending thinskinned belts. This slip transfer is controlled by the Late Jurassic main detachment. These structures have low gravity anomalies that cross obliquely the main Andean trend. East of this inversion domain, beneath the frontal thinskinned belts, seismic information reveals that Late Triassic wedgelike depocenters did not experience substantial inversion. To the east doublevergent basement blocks define the Andean emergent orogenic front at these latitudes. These contractional structures truncate gravity anomalies defined by basement discontinuities, indicating that they are not related to tectonic inversion, in contraposition to the westernmost domain. Two contractional phases were distinguished. The oldest is Late Cretaceous in age, as inferred from onlap relations in Upper Cretaceous strata identi fied in seismic lines. These successions have a maximum age of 97 Ma as inferred by UPb in detrital zircons published in previous studies in the area. Contrastingly, the easternmost sector was mainly deformed in Late Miocene times as inferred from less than 18 Ma old synorogenic deposits. Moreover, contractional mechanisms varied through time for each specific sector. While Late Cretaceous contractional tectonics was generated by tectonic inversion and subordinate thinskinned deformation, it is proposed that Late Miocene deformation was controlled mainly by brittleductile transi tions at the upper crust with no major influence of previous structures. This fact can be explained by a higher thermal flux achieved in the retroarc area in the last 17 Ma due to the eastward arc expansion during a shallow subduction regime. RESUMEN. Controles estructurales variables en el tiempo en los Andes Centrales Australes (~36ºS). Los AndesCentrales Australes a los 36ºS han sido reconocidos como una faja orogénica en donde la contracción, principalmente acomodada por estructuras de basamento, está asociada a la inversión de un sistema extensional del Triásico TardíoJurásico Temprano. Basados en una sección estructural, construida a partir de datos de campo, líneas sísmicas 2D, datos de pozo y el procesamiento de anomalías de Bouger, proponemos una evolución tectónica polifásica. En el sector occidental, a lo largo del eje cordillerano, estructuras de basamento con orientación NW a NNW fueron invertidas actuando como un control de primer orden en la generación de fajas frontales de piel fina angostas y de orientación norte. La transferenci...

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Section: Description Of Contractional Geometry From Seismic Informationmentioning

confidence: 86%

Section: Geological Settingmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Section: Description Of Contractional Geometry From Seismic Informationmentioning

confidence: 99%

See 2 more Smart Citations

Variable structural controls through time in the Southern Central Andes (~36ºS)

Orts

Folguera

Giménez

et al. 2012

andgeo

Self Cite

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“…Los estudios geocronológicos de los circones detríticos demuestran la presencia de edades entre 102±2 Ma y 100±8 Ma en las unidades inferiores del Grupo Neuquén (Di Giulio et al, 2012), que se interpreta como una respuesta al sistema geodinámico de la cuenca del antepaís. De acuerdo con el modelo conceptual propuesto por Yang y Miall (2010), el avance del frente de corrimiento hacia el este del cinturón plegado y corrido del Agrio (Tunik et al, 2010) ocasiona la migración del abultamiento periférico de la cuenca de antepaís, como consecuencia de la repuesta flexural de la misma.…”

Section: Estratigrafía Secuencialunclassified

Sedimentología y estratigrafía de alta resolución del subgrupo río Neuquén (Cretácico Superior) departamento confluencia, provincia de Neuquén, Argentina

Sánchez

Asurmendi

Armas

2014

Andgeo

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RESUMEN.En el sector centro-este de la Cuenca Neuquina, suroeste de Neuquén, Patagonia Argentina, el Subgrupo Río Neuquén de origen continental ha sido dividido en dos secuencias estratigráficas incompletas (SI y SII) sobre la base de discontinuidades que limitan arreglos de litofacies y elementos arquitecturales característicos. Parte de la sucesión (Formación Portezuelo-SI) se formó a partir de sistemas fluviales de baja y alta sinuosidad que drenaban hacia el noreste. La acreción lateral y oblicua es un rasgo importante de los sistemas de alta energía con carga mixta. Los depósitos de planicie de inundación dominan la estratigrafía, contribuyendo con más del 45% de los sedimentos. La Formación Plottier (SII) se acumuló a partir de un sistema de baja sinuosidad perenne con un buen desarrollo de los depósitos de planicie aluvial con eventos de inundaciones. La unidad se acumuló sobre una topografía con un gradiente general hacia el este-noreste. La arquitectura aluvial y patrones de apilamiento en el Subgrupo Río Neuquén estuvo controlada por la combinación de factores alogénicos, el más significativo fue la tectónica seguida por el clima. La sucesión del Cretácico Tardío en la cuenca de antepaís andina, depositada en la cuenca periférica, consiste de ciclos tectónicos que comprenden dos componentes: estratos depositados en una cuenca subalimentada (Formación Portezuelo, AA-SI) y sedimentación en una cuenca sobrealimentada sin un abultamiento periférico definido topográficamente (Formación Plottier, BA-SII). ABSTRACT. Sedimentology and high resolution stratigraphy of Río Neuquén Subgroup (Upper Cretaceous) department Confluence, Province of Neuquén, Argentina.The Upper Cretaceous exposid in the northeastern part of the Neuquén Basin, southeast of Neuquén, Argentina. Río Neuquén Subgroup of continental origin, has been divided into two incomplete stratigraphic sequence units (SI y SII) on the basis of lithofacies assemblages and architectural elements. Parts of the succession (Portezuelo Formation SI) formed in northeasward-draining low and high sinuosity fluvial systems. Those are analyzed in detail in terms of macroform-scale and stratigraphic-level architecture to assess fluvial styles and the evolution of non-marine depositional environments. Lateral and oblique accretion is a significant process of deposition in high-energy systems with mixed load. The overbank deposits dominate the floodplain stratigraphy; they contribute more than 45% of floodplain sediments. The Plottier Formation (SII) was accumulated from a low sinuosity perennial system with well developed deposits of alluvial plain with flood events. The unit was accumulated on topographic slopes dipping from west-southwest to east-northeast. The alluvial architecture and stacking patterns in the Río Neuquén Subgroup were controlled by a combination of allogenic factors, most significantly tectonics followed by climate. The Upper Cretaceous succession in the Andean foreland basin, deposited in a backbulge zone, consists of tectonically-driven cycles ...

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The fracture network, a proxy for mesoscale deformation: Constraints on layer parallel shortening history from the Malargüe fold and thrust belt, Argentina

et al. 2015

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An analysis was performed of the fracture networks in the N-S trending thick-skinned Malargüe fold and thrust belt (MFTB). A total of 2000 planar structures including joints and veins were measured in different structural domains ranging from surficial thin-skinned systems detached in the cover to large-scale structures such as basement-cored folds. The investigated stratigraphic section ranges from the Middle Jurassic (Cuyo Group) to the Paleocene (Malargüe Group), including sandstones, siltstones, shales, and limestones. Four main fracture sets are identified trending, E-W, NW-SE, NE-SW, and N-S. The abutting relationships provide a reliable chronology between the four fracture sets which are ubiquitously found in the MFTB throughout the various structural domains. Due to this observation, we assume the fracture signal to be regional and developed in response to both large-scale processes and folding. In particular, based on a fold test and the characteristics of data dispersion, the fracture sets I, II, and III exhibit a prefolding origin, while set IV shows a synfolding origin. A regional interpretation of the various fractures is proposed, involving several stages of fracture formation from compaction to folding, including prefolding layer parallel shortening. The fracture signal yields useful insights about the structural history of the MFTB and the spatiotemporal evolution of the foreland tectonic regime since Late Cretaceous times. We then place the various identified fracture sets into the known pattern of geodynamic evolution since the Late Cretaceous.

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Early uplift and orogenic deformation in the Neuquén Basin: Constraints on the Andean uplift from U–Pb and Hf isotopic data of detrital zircons

Cited by 201 publications

References 43 publications

Variable structural controls through time in the Southern Central Andes (~36ºS)

Variable structural controls through time in the Southern Central Andes (~36ºS)

Sedimentología y estratigrafía de alta resolución del subgrupo río Neuquén (Cretácico Superior) departamento confluencia, provincia de Neuquén, Argentina

The fracture network, a proxy for mesoscale deformation: Constraints on layer parallel shortening history from the Malargüe fold and thrust belt, Argentina

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