Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina)

Vizán, Haroldo; Geuna, Silvana Evangelina; Melchor, Ricardo N.; Bellosi, Eduardo S.; Lagorio, Silvia Leonor; Vasquez, Carlos Alberto; Japas, María Silvia; Ré, Guillermo H.; Campo, Margarita Do

doi:10.1016/j.tecto.2012.10.026

Cited by 13 publications

(10 citation statements)

References 48 publications

(62 reference statements)

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“…The values obtained indicate non-significant rotation of the study locality during the last 9 Ma. Lack of significant Andean tectonic rotations in this area reinforces previous ideas (Aubry et al 1996;de Urreiztieta et al 1996;Beck 1998;Taylor et al 1998;Coutand et al 1999;Spagnuolo et al 2010;Zambrano et al 2010;Ré et al 2001;Japas and Ré 2006;Japas and Ré 2012;Vizán et al 2013) that rotations in this region do not follow a simple and uniform pattern. Beck (1998), Prezzi et al (2004), Japas and Ré (2012) and Somoza and Tomlinson (2002) claim that no significant rotation should be expected in the region since 10 Ma.…”

Section: 1-tectonic Rotationsupporting

confidence: 87%

Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina

Spagnuolo

Georgieff

Rapalini

2015

Journal of South American Earth Sciences

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Section: 1-tectonic Rotationsupporting

confidence: 87%

Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina

Spagnuolo

Georgieff

Rapalini

2015

Journal of South American Earth Sciences

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“…Clockwise rotations observed in the models are related to dextral transpression and are comparable to paleomagnetic data from Japas and Ré (2012) and Vizán et al (2013). Likewise, these clockwise rotations are equivalent to rotations of kinematic axes (Siame et al, 2005;Oriolo et al, 2013) within the Precordillera.…”

Section: Models and The Neogene Structure Of The Precordillerasupporting

confidence: 79%

Estructura neógena de la Precordillera Andina, Argentina: aportes de modelos análogos.

Oriolo

Cristallini

Japas

et al. 2015

Andgeo

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ABSTRACT. Analogue models combining different sets of preexisting structural weaknesses were developed to understand their evolution during regional ~ENE shortening. Strain analysis of simulations was performed with the GEODEF 1.1 software, a tool that allows to quantify deformation in plan view on the basis of displacement fields. Results showed up that regional NNE heterogeneities are reactivated as dextral reverse-slip structures, though NNE neoformed thrusts are also present. Likewise, dominant sinistral strike-slip motions have been obtained for reactivated second-order WNW structures whereas sinistral reverse-slip has been recorded for NW ones. Comparison of these results with structural, kinematic and paleomagnetic data supports partitioned dextral transpression for the northern Andean Precordillera since the Miocene. Moreover, models not only confirm sinistral strike-slip motions for WNW structures of the Precordillera but also suggest that they would represent preexisting crustal fabrics that were reactivated during the Andean orogeny. These cross-strike structures have played a significant role in the construction and evolution of the fold and thrust belt as they segmentate the activity of orogen-parallel structures. RESUMEN. Estructura neógena de la Precordillera Andina, Argentina: aportes de modelos análogos. Se llevaron a cabo una serie de modelos análogos en los que se combinaron diferentes sistemas de debilidades estructurales preexistentes a fin de entender su evolución vinculada a acortamiento regional en dirección ~ENE. El análisis de la deformación de las simulaciones fue realizado a través del software GEODEF 1.1, una herramienta que permite la cuantificación de la deformación en planta sobre la base de campos de desplazamiento. Los resultados obtenidos muestran que las heterogeneidades regionales de rumbo NNE se reactivan como estructuras dextrales inversas, si bien también se generan corrimientos neoformados de igual orientación. Asimismo, se obtuvieron desplazamientos de rumbo sinistral dominante para estructuras reactivadas de segundo orden de rumbo WNW, mientras que desplazamientos sinistrales inversos se registraron en aquellas de rumbo NW. La comparación de estos resultados con datos estructurales, cinemáticos y paleomagnéticos señala la existencia de transpresión dextral particionada para el precordillera norte desde el Mioceno. A su vez, los modelos no solo confirman los desplazamientos de rumbo sinistral para las estructuras WNW de la precordillera, sino que también sugieren que estas constituirían fábricas corticales preexistentes que fueron reactivadas durante la orogenia andina. Estas estructuras oblicuas han tenido un rol significativo en la construcción y evolución de la faja plegada y corrida, ya que segmentan la actividad de las estructuras paralelas al orógeno.

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“…Our results indicate a major change in both sediment provenance and depositional environment during Paleocene‐Eocene time, with inception of an evaporative fluvial‐lacustrine system that received sediments from a dominantly Andean‐derived source (i.e., Frontal Cordillera and magmatic arc) (Figure ). The Puesto La Flecha Formation in the Huaco area (this study) exhibits similar lithofacies as those reported in the ~38–34 Ma Laguna Brava Formation to the north (Figure ) [ Vizán et al ., ]. Based on sedimentological similarity, we propose that these units are stratigraphically equivalent and genetically related.…”

Section: Discussionmentioning

confidence: 99%

“…Following the nomenclature of Ciccioli et al [] and based on sedimentological similarities, we suggest that these deposits are indeed correlative to the Puesto La Flecha Formation and hereafter we refer to this distinctive red bed series as such in the Bermejo Basin (Figure ). Also in the north, the Laguna Brava Formation yields an Eocene age based on paleomagnetic study [ Vizán et al ., ], which represents a lateral continuation of the Puesto La Flecha Formation In this study, we focus on the timing of sedimentation and paleogeography of the earlier basin history of the Bermejo Basin.…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…[], Allmendinger and Judge [], and new mapping. Published stratigraphic studies referred to within the text include DL = Divisadero Largo [ Yrigoyen , ; Folguera et al ., ], LB = Laguna Brava [ Vizán et al ., ], LT = La Troya [ Tedesco and Limarino , ; Ciccioli et al ., ], P = Pachaco, T = Talacasto [ Levina et al ., ], and V = Vinchina [ Limarino et al ., ; Ciccioli et al ., , ]. Sections from this study: ET = El Templo, PLF = Puesto La Flecha, and RF = Río Francia.…”

Section: Introductionmentioning

confidence: 99%

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Retroarc basin reorganization and aridification during Paleogene uplift of the southern central Andes

et al. 2017

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Tectonic development of the Andean Cordillera has profoundly changed the topography, climate, and vegetation patterns of the southern central Andes. The Cenozoic Bermejo Basin in Argentina (~30°S) provides a key record of thrust belt kinematics and paleoclimate south of the high‐elevation Puna Plateau. Ongoing debate regarding the timing of initiation of upper plate shortening and Andean uplift persists, precluding a thorough understanding of the earlier tectonic and climatic controls on basin evolution. We present new sedimentology, detrital geochronology, sandstone petrography, and subsidence analysis from the Bermejo Basin that reveal siliciclastic‐evaporative fluvial and lacustrine environments prior to the main documented phase of Oligocene‐Miocene shortening of the Frontal Cordillera and Argentine Precordillera. We report the first radiometric dates from detrital zircons collected in the Ciénaga del Río Huaco Formation, previously mapped as Permian, that constrain a Late Cretaceous (~95–93 Ma) maximum depositional age. Provenance and paleocurrent data from these strata indicate that detritus was derived from dissected arc and cratonic sources in the north and northeast. Detrital zircon U‐Pb ages of ~37 Ma from the overlying red beds suggest that foredeep sedimentation began by at least the late Eocene. At this time, sediment dispersal shifted from axial southward to transversal eastward from the Andean Arc and Frontal Cordillera. Subsidence analysis of the basin fill is compatible with increasing tectonic deformation beginning in Eocene time, suggesting that a distal foredeep maintained fluvial connectivity to the hinterland during topographic uplift and unroofing of the Frontal Cordillera, prior to Oligocene‐Miocene deformation across the Precordillera.

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Geological setting and paleomagnetism of the Eocene red beds of Laguna Brava Formation (Quebrada Santo Domingo, northwestern Argentina)

Cited by 13 publications

References 48 publications

Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina

Magnetostratigraphy of the Miocene Las Arcas Formation, Santa María Valley, northwestern Argentina

Estructura neógena de la Precordillera Andina, Argentina: aportes de modelos análogos.

Retroarc basin reorganization and aridification during Paleogene uplift of the southern central Andes

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