New data on neotectonic contractional structures in Precordillera, south of Río de La Flecha: Structural setting from gravity and magnetic data. San Juan, Argentina

Perucca, Laura; Ruíz, Francisco

doi:10.1016/j.jsames.2013.11.006

Cited by 14 publications

(10 citation statements)

References 44 publications

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“…However, dextral strike-slip displacements would not be restricted to the El Tigre fault but also to the eastern margin, as the models and recently published data suggests (Perucca and Ruiz, 2014). -WNW and NW weaknesses are reactivated as sinistral strike-slip (β=100º) or sinistral transpressional (β=130º) structures that do not develop unless they represent inherited structures.…”

Section: Discussionmentioning

confidence: 90%

“…7a, b), where both reverse and dextralstrike slip deformation have been recently registered (Perucca and Ruiz, 2014). Furthermore, these equivalences allow interpreting that the obliqueslip displacements may result from reactivation of preexisting basement structures that correspond to Paleozoic terrane boundaries (Giménez et al, 2008;Perucca and Ruiz, 2014).…”

Section: Models and The Neogene Structure Of The Precordilleramentioning

confidence: 96%

“…In this case, a geometric scale factor λ=2x10 -6 was considered, which represents the ratio between the length of the model and its equivalent length in the nature. Gravity ratio was g´=1, whereas density ratio was ρ´=0.6, considering a mean density ρ=2,500 kg m -3 for sedimentary rocks in the Precordillera (Perucca and Ruiz, 2014). Therefore, the stress ratio between models and nature was σ´=ρ´g´λ=1.2x10 -6 .…”

Section: Experimental Configurationmentioning

confidence: 99%

“…Neoformed thrusts from domain 3 would be the analogous of the Precordillera fold and thrust belt (Allmendinger et al, 1990;Cristallini and Ramos, 2000) whereas domain 2 would be equivalent to the Tulum fault system (Fig. 7a, b), where both reverse and dextralstrike slip deformation have been recently registered (Perucca and Ruiz, 2014). Furthermore, these equivalences allow interpreting that the obliqueslip displacements may result from reactivation of preexisting basement structures that correspond to Paleozoic terrane boundaries (Giménez et al, 2008;Perucca and Ruiz, 2014).…”

Section: Models and The Neogene Structure Of The Precordilleramentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 90%

Section: Models and The Neogene Structure Of The Precordilleramentioning

confidence: 96%

Section: Experimental Configurationmentioning

confidence: 99%

Section: Models and The Neogene Structure Of The Precordilleramentioning

confidence: 99%

See 2 more Smart Citations

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

Oriolo

Cristallini

Japas

et al. 2015

Andgeo

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“…We calculated the strength of the different basement and sedimentary rocks to brittle failure and frictional sliding using equations (1) and (2) and V p and ρ estimates for Cuyania basement rocks (Pérez Luján et al 2015), Precordillera Palaeozoic sedimentary rocks (Pérez Luján et al 2013; Perucca & Ruiz, 2014), Choiyoi basement and Neuquén basin sedimentary rocks (Rojas Vera et al 2010), and Cuyo basin sedimentary rocks (Miranda & Robles, 2002), as well as the theoretical calculations of density for different lithologies and their variation with depth of Tassara (2006). The data are shown in Table 2, and results are summarized in Figure 5.…”

Section: Estimation Of the Strength Of The Different Basement Domainsmentioning

confidence: 99%

Basement composition and basin geometry controls on upper-crustal deformation in the Southern Central Andes (30–36°S)

et al. 2016

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-Deformation and uplift in the Andes are a result of the subduction of the Nazca plate below South America. The deformation shows variations in structural style and shortening along and across the strike of the orogen, as a result of the dynamics of the subduction system and the features of the upper plate. In this work, we analyse the development of thin-skinned and thick-skinned fold and thrust belts in the Southern Central Andes (30-36°S). The pre-Andean history of the area determined the formation of different basement domains with distinct lithological compositions, as a result of terrane accretions during Palaeozoic time, the development of a widespread Permo-Triassic magmatic province and long-lasting arc activity. Basin development during Palaeozoic and Mesozoic times produced thick sedimentary successions in different parts of the study area. Based on estimations of strength for the different basement and sedimentary rocks, calculated using geophysical estimates of rock physical properties, we propose that the contrast in strength between basement and cover is the main control on structural style (thin-v. thick-skinned) and across-strike localization of shortening in the study area.

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Geodetic Changes Associated with Crustal Deformation on the Andean Backarc of San Juan, Argentina

Leiva

Ruíz

Acosta

et al. 2018

Pure Appl. Geophys.

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New data on neotectonic contractional structures in Precordillera, south of Río de La Flecha: Structural setting from gravity and magnetic data. San Juan, Argentina

Cited by 14 publications

References 44 publications

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

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

Basement composition and basin geometry controls on upper-crustal deformation in the Southern Central Andes (30–36°S)

Geodetic Changes Associated with Crustal Deformation on the Andean Backarc of San Juan, Argentina

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