Cross-strike structures controlling magmatism emplacement in a flat-slab setting (Precordillera, Central Andes of Argentina)

Oriolo, Sebastián; Japas, María Silvia; Cristallini, Ernesto Osvaldo; Giménez, Mario

doi:10.1144/sp394.6

Cited by 11 publications

(13 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are consistent with several proposals (Flinch and Casas, 1996;Pohn, 2001;Japas et al, 2010;Oriolo, 2012;Oriolo et al, 2013) where cross-strike structures are described as pre-existing crustal fabrics. Moreover, similar geometrical and kinematical relationships between dextral shear zones and secondary oblique sinistral ones were presented by theoretical models of Jiang (1994) and examples from the Zagros fold and thrust belt (Hessami et al, 2001), the Atacama fault system (Cembrano et al, 2005) and the Cap de Creus (Carreras et al, 2013).…”

Section: Deformation Patternssupporting

confidence: 92%

“…Left-lateral WNW structures have been confirmed within the Hualilán Belt (Fig. 2) by Oriolo (2012) and Oriolo et al (2013). These authors have remarked the role of these WNW and subordinated ENE cross-strike structures as the main structural control of magmatism emplacement due to the into-the-foreland migration associated with the flat-slab process.…”

Section: Wnw Cross-strike Structuresmentioning

confidence: 85%

“…Kinematics of cross-strike structures shows dominant strike-slip displacements as well as a minor component of extension that would favor the magmatic output and emplacement. Ré et al (2001), Oriolo (2012) and Oriolo et al (2013) have also proposed the existence of other cross-strike structural belts, that would be equivalent to the one located in the Hualilán region. One of these is placed between Gualcamayo and Jachal localities (~30º S), where Chernicoff and Nash (2002) have demonstrated the relationship between Cenozoic magmatism and associated ore deposits and NW-WNW cross-strike structures.…”

Section: Wnw Cross-strike Structuresmentioning

confidence: 99%

“…They were first suggested by Japas (1998), Ré et al (2000Ré et al ( , 2001, Japas et al (2002a, b) and Ré and Japas (2004) and then confirmed as sinistral cross-strike structures in the Hualilán region (Oriolo, 2012;Oriolo et al, 2013). These authors have considered these crossstrike structures as reactivated pre-Neogene fabrics, though a possible Miocene age can not be discarded.…”

Section: Introductionmentioning

confidence: 98%

“…Subordinated oblique sand ribbons are induced to analyse the influence of pre-existing heterogeneities in the basal level. Their influence during shortening of the overlying sand pile can be compared with cross-strike structures described by Oriolo (2012) and Oriolo et al (2013). Therefore, they were not included in model I in order to determine if they could be developed when they do not represent inherited features.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Oriolo

Cristallini

Japas

et al. 2015

Andgeo

View full text Add to dashboard Cite

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.

show abstract