Fault zone development and strain partitioning in an extensional strike-slip duplex: A case study from the Mesozoic Atacama fault system, Northern Chile

Cembrano, José; González, Gabriel; Arancibia, Gloria; Ahumada, Iván; Olivares, Viviana; Herrera, Verónica

doi:10.1016/j.tecto.2005.02.012

Cited by 115 publications

(99 citation statements)

References 30 publications

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“…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). However, oblique ENE-trending structures do develop even though previous structures are not present (Fig.…”

Section: Deformation Patternssupporting

confidence: 63%

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: Deformation Patternssupporting

confidence: 63%

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

Oriolo

Cristallini

Japas

et al. 2015

Andgeo

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“…A significant difference to other strike-slip basins in a similar evolutionary stage (e.g. Reijs and McClay 2003;Cembrano et al 2005), as well as analogue models on pull-aparts (e.g. Dooley and McClay 1997;Wu et al 2009) is the lack of cross-basin shortcut faults.…”

Section: Pull-apart Basin Characteristics and Analoguesmentioning

confidence: 95%

Flexural basin reworked by salt-related pull-apart structures: the Adony Basin

Palotai¹,

Csontos²

2012

Central European Geology

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Several main tectonic lineaments originating in the Alps and Dinarides merge in Central Hungary to form the Mid-Hungarian Shear Zone. As these structures are hidden beneath sub-basins of the Neogene Pannonian Basin, it has long been debated whether the tectonic style of the shear zone is mainly contractional or strike-slip. New 3D seismic data allowed a detailed analysis of one of these sub-basins, the Adony Basin, located south of Budapest. Its evolution is linked to the tectonics between the southern Tisza unit of European passive margin affinity, the northern ALCAPA block with Alpine affinity, and sheared remnants of Dinaric units in between. During the Oligocene and Early to Middle Miocene, a flexural basin related to the convergent thrusting of Dinaric-and ALCAPA-derived units was developed. On the southern side, N-NW verging thrust sheets were observed. On the opposite front, Triassic carbonates of ALCAPA were thrust several kilometres above Palaeogene formations to the SW. Dextral transpression is assumed for the Middle Miocene. Local deposition of Middle Miocene salt in the basin formed a detachment surface. Late Miocene sinistral strike-slip faulting resulted in a pull-apart basin above that part of the earlier flexural basin that has not been overthrust. The margins of the basin coincided with the fronts of earlier thrusts. Faults on the basin margins partly detached on the salt, decoupling the supra-salt basin fill from the underlying formations. Within the pull-apart basin, gravity sliding on the steep margins resulted in salt welds, detachment and roll-over folds.

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“…Between the Late Permian and the Early Cretaceous, the Andean crust in north and central Chile was deformed as a retreating subduction boundary, characterized by mostly extensional and transtensional deformation (e.g., Grocott et al, 1994;Scheuber and González, 1999;Grocott and Taylor, 2002;Cembrano et al, 2005). This deformation, mostly along the magmatic arc and the Atacama Fault Zone, was contemporaneous with the subsidence of Early Cretaceous basins in north and central Chile, in which large volumes of mantle-derived lavas accumulated (Vergara et al, 1995;Aguirre et al, 1999).…”

Section: Geological Settingmentioning

confidence: 99%

Transtension y transpresion del Jurasico Medio-Superior al Cretacico Inferior durante la construccion del arco magmatico en Chile central: evidencia a partir de enjambres de diques maficos.

Creixell¹,

Parada²,

Morata³

et al. 2011

Andgeo

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AbstrACt. The Middle-Late Jurassic mafic dike swarms of central Chile between 33º and 33º45'S register the tectonic activity of the contemporaneous arc represented by the Coastal batholith. These dike swarms evidence alternate episodes of transtension and transpression across NW-striking structures, which controlled the construction of the magmatic arc. The Middle-Upper Jurassic and Lower Cretaceous mafic dike swarms in the Coastal range of central Chile has been studied through field observations, geochronology and AMS (anisotropy of magnetic susceptibility) to document the tectonic and magmatic evolution of the Jurassic-Cretaceous arc at this latitude. Middle to Upper Jurassic dike swarms (Concón and Cartagena mafic dike swarms) were emplaced between 163 and 157 Ma, along NW-SE to WNW-ESE-striking host fractures, registering a first stage of magma emplacement under sinistral transtension. During this stage, dikes acquired a fabric characterized by magnetic foliation clockwise oblique to dike trend and gently plunging lineations. This stage was followed rapidly by dike emplacement under sinistral transpression, with associated steeply plunging lineations in the dikes, reverse shear zones in the country rocks and local occurrence of horizontal mafic dikes. On the other hand, the Lower Cretaceous El Tabo Dike Swarm was emplaced along tensile fractures that do not register shear displacements along their walls. These dikes were emplaced at shallower crustal levels along tensile fractures.Within each dike swarm, differences in the tectonic style of emplacement correlates with changes in the geochemical composition of the dikes, suggesting a strong coupling between tectonics and nature of magma supplies in the arc. Finally, the current results show that the Mesozoic evolution of the Coastal Batholith of central Chile occurred in several stages of deformation and not under a simple scenario of extensional tectonics. This magmatism and deformation were strongly controlled by NW-to WNW-striking fractures. These structures are spatially correlated with regional-scale Cenozoic lineaments that are oblique to the orientation of the Andean orogen. We suggest that these lineaments are features inherited at least from Jurassic times. Middle-late Jurassic to early cretaceous transtension and transpression during arc building in central chile... rEsuMEn. transtensión y transpresión del Jurásico Medio-superior al Cretácico Inferior durante la construcción del arco magmático en Chile central: evidencia a partir de enjambres de diques máficos. Los enjambres de diques máficos del Jurásico Medio-Superior de Chile central entre los 33º y 33º45'S registran la actividad tectónica del arco contemporáneo representado por el batolito costero. Estos enjambres de diques evidencian episodios alternados de transtensión y transpresión a lo largo de estructuras de rumbo NW, las cuales controlaron la construcción del arco magmático. Los enjambres de diques máficos del Jurásico Medio-Superior y del Cretácico Inferior de la Cordillera de la Costa...

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Fault zone development and strain partitioning in an extensional strike-slip duplex: A case study from the Mesozoic Atacama fault system, Northern Chile

Cited by 115 publications

References 30 publications

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

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

Flexural basin reworked by salt-related pull-apart structures: the Adony Basin

Transtension y transpresion del Jurasico Medio-Superior al Cretacico Inferior durante la construccion del arco magmatico en Chile central: evidencia a partir de enjambres de diques maficos.

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