Inversion of a transfer system into lateral ramps: An example from the South-Central Pyrenees (Spain)

Flinch, Joan; Casas, Josep Maria

doi:10.1007/bf02422242

Cited by 8 publications

(1 citation statement)

References 26 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).…”

Section: Deformation Patternssupporting

confidence: 92%

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: 92%

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

Oriolo

Cristallini

Japas

et al. 2015

Andgeo

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Rising and falling diapirs, shifting depocenters, and flap overturning in the Cretaceous Sopeira and Sant Gervàs subbasins (Ribagorça Basin, southern Pyrenees)

Oró²,

et al. 2016

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The halokinetic structure of inverted salt‐related continental margins is frequently obliterated by compressional overprinting. The Cretaceous Sopeira and Sant Gervàs subbasins of the Ribagorça Basin (south central Pyrenees) show evidence of salt‐related extensional tectonics and diapiric growth along the Iberian Margin of the Mesozoic Pyrenean rift. We present an integrated field‐based tectonic‐sedimentary study to reconstruct the evolution of the Ribagorça Basin system previous to, and in the early stages of, the Pyrenean orogeny. The ~4 km thick Albian‐Cenomanian Sopeira minibasin infill thins toward the basin borders, especially toward the eastern, N‐S trending, Llastarri salt weld. The 90° tilt to the south of the Sopeira basin bottom records the growth of the buried north dipping Sopeira listric fault from Albian to Santonian times, when it evolved as an extensional rollover associated with the Aulet salt roller. The ~3 km thick Cenomanian‐Campanian succession filling the Sant Gervàs flap displays 130° bed fanning attitude from overturned Cenomanian carbonate platform strata to upright Campanian turbidite beds. The Sant Gervàs flap development since Cenomanian times was related to the fall of a large salt pillow after the main Soperia minibasin stage. Jurassic‐Campanian diachronous subsidence is also observed in the adjacent Montiberri, Faiada, and Tamurcia depocenters. Correlation with the Pedraforca, Cotiella, and Basque‐Cantabrian Basins along the southern Pyrenees suggests that a significant segment of the Iberian side of the Pyrenean rift experienced a gravity‐driven extension from Albian to late Santonian. The Ribagorça Basin provides an excellent field analogue for presently buried salt‐related structures of extended passive margins.

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Late Cretaceous Post-Rift to Convergence in Iberia

Martı́n-Chivelet

Floquet

García-Senz

et al. 2019

The Geology of Iberia: A Geodynamic Approach

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Inversion of a transfer system into lateral ramps: An example from the South-Central Pyrenees (Spain)

Cited by 8 publications

References 26 publications

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

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

Rising and falling diapirs, shifting depocenters, and flap overturning in the Cretaceous Sopeira and Sant Gervàs subbasins (Ribagorça Basin, southern Pyrenees)

Late Cretaceous Post-Rift to Convergence in Iberia

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