Along-strike structural variations in the Southern Patagonian Andes: Insights from physical modeling

Likerman, Jeremías; Burlando, Juan Francisco; Cristallini, Ernesto Osvaldo; Ghiglione, Matías C.

doi:10.1016/j.tecto.2013.01.018

Cited by 42 publications

(36 citation statements)

References 67 publications

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“…This interpretation implies a clockwise rotation in the orientation of the compressive strain during the late stages of the foreland basin evolution. On the other hand, the orientation of folds is also controlled by the orientation and shape of underlying basement blocks, and Likerman et al [] suggested that significant along‐strike variations in width and lateral position of the structural domains with the Última Esperanza province may reflect a first‐order control by the Jurassic extensional depocenters.…”

Section: Discussionmentioning

confidence: 99%

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

et al. 2014

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The Magallanes fold and thrust belt (FTB) presents a large-scale curvature from N-S oriented structures north of 52°S to nearly E-W in Tierra del Fuego Island. We present a paleomagnetic and anisotropy of magnetic susceptibility (AMS) study from 85 sites sampled in Cretaceous to Miocene marine sediments. Magnetic susceptibility is lower than 0.0005 SI for 76 sites and mainly controlled by paramagnetic minerals. AMS results indicate that the sedimentary fabric is preserved in the undeformed areas of Tierra del Fuego and the more external thrust sheets units, where an incipient lineation due to layer parallel shortening is recorded. Prolate AMS ellipsoids, indicating a significant tectonic imprint in the AMS fabric, are observed in the internal units of the belt. AMS results show a good correlation between the orientation of the magnetic lineation and the fold axes. However, in Península Brunswick, the AMS lineations are at~20°counterclockwise to the strike of the fold axes. Pretectonic stable characteristic remanent magnetizations (ChRM) were determined in seven sites. A counterclockwise rotation (21.2°± 9.2°) is documented by ChRM data from four sites near the hinge of the belt in Península Brunswick and near Canal Whiteside while there is no evidence of rotation near the nearly E-W oriented Vicuña thrust within Tierra del Fuego. The curved shape of the Cenozoic Magallanes FTB is not related to vertical axis rotation, and thus, the Magallanes FTB can be considered as a primary arc.

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Section: Discussionmentioning

confidence: 99%

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

et al. 2014

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“…The sand has a density ρ=1,400 kg m -3 , an internal friction angle φ=32.7° and negligible cohesion C 0 <100 Pa (Yagupsky et al, 2008) and, therefore, is a good analog for the brittle upper crust (Davy and Cobbold, 1991). The silicone is a viscous material with a viscosity of 2.5x10 3 Pa s (Stewart, 1996, Likerman et al, 2013) that can be considered a Maxwell solid (Casassa et al, 1986). The selected configuration of sand overlying a silicone layer were used by other authors (Casas et al, 2001;Soto et al, 2007;Yagupsky et al, 2008;Leever et al, 2011;Likerman et al, 2013), supporting the validity of both set-up and materials.…”

Section: Experimental Configurationmentioning

confidence: 99%

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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“…8 faults and crustal attenuation that are thought to have played a key role during later foreland propagation of the deformation (Winslow, 1982;Fosdick et al, 2011Fosdick et al, , 2014Likerman et al, 2013). The first sedimentary infill of the marginal basin is represented by the Upper Jurassic to Lower Cretaceous submarine silicic volcanics and volcaniclastic levels of the Tobifera (or Lemaire) formation, and dark mudstones of the Yahgan (or Zapata) formation, followed by slope mudstones of the Beauvoir Formation (Wilson, 1991;Fildani and Hessler, 2005;Olivero and Malumián, 2008;Menichetti et al, 2008;Klepeis et al, 2010).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…It has been already pointed out the key role of pre-existing Jurassic normal faults rooted in the basement of the South American continental margin in the evolution of the Magallanes foreland basin sedimentation and subsequent deformation (Menichetti et al, 2008;Likerman et al, 2013;Fosdick et al, 2011Fosdick et al, , 2014Ghiglione et al, 2013).…”

Section: An Alternative Tectonic Model For the Formation Of The Patagmentioning

confidence: 99%

“…While ~N-S oriented normal faults and ~E-W oriented transfer faults associated to the rifting of the Rocas Verdes basin have been documented affecting the basement of the Patagonian Andes (Likerman et al, 2013;Fosdick et al, 2011), the Jurassic extensional fault array in Tierra del Fuego consist of N to NW oriented normal faults and E to NE oriented transfer faults . We, therefore, propose that the pre-existing Jurassic faults in the basement of the Southern Andes (N-S trending in the Patagonian Andes, and E-W oriented in the Fuegian Andes) controlled the Late Cretaceous to Cenozoic kinematic evolution and final geometry of the curved Magallanes fold-and-thrust belt.…”

Section: Accepted M Manuscript 26mentioning

confidence: 99%

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Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility

et al. 2015

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Along-strike structural variations in the Southern Patagonian Andes: Insights from physical modeling

Cited by 42 publications

References 67 publications

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study

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

Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility

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