Restoration of basins driven by extension and salt tectonics: Example from the Cotiella Basin in the central Pyrenees

López‐Mir, Berta; Muñoz, Josep Antón; Senz, Jesús García

doi:10.1016/j.jsg.2014.09.022

Cited by 49 publications

(57 citation statements)

References 19 publications

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“…See Lopez‐Mir et al . [] for problems regarding the restoration of similar geometries. ê = extension rate.…”

Section: Discussionmentioning

confidence: 99%

“…Grounding and basal welding has been assumed for the Montiberri turtle structure. See Lopez-Mir et al [2014a] for problems regarding the restoration of similar geometries. ê = extension rate.…”

Section: Structural Geometry and Tectonosedimentary Evolution Of The mentioning

confidence: 99%

“…These results are integrated within the larger Mesozoic Pyrenean rift basin framework that has been a topic of increased interest in the last years. In this sense, the comparison of our results with transects across the Basque‐Cantabrian region [ Serrano and Martínez del Olmo , ], Cotiella thrust sheet [ McClay et al ., ; Lopez‐Mir et al ., ], and the Pedraforca thrust sheet [ Vergés , ; García Senz , ] adds to a consistent characterization of the salt‐related Mesozoic Pyrenean rifting episode along the north Iberian Margin.…”

Section: Introductionmentioning

confidence: 99%

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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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“…See Lopez‐Mir et al . [] for problems regarding the restoration of similar geometries. ê = extension rate.…”

Section: Discussionmentioning

confidence: 99%

Section: Structural Geometry and Tectonosedimentary Evolution Of The mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…between the Armeña and Mediodía sub-basins) documents the presence of halokinetic sequences (Giles & Lawton, 2002;Giles & Rowan, 2012) during passive diapirism during their deposition . These observations together with sequential restoration of the current extensional structures (Lopez-Mir et al, 2014) led to a re-interpretation of the structural evolution of the area. This is characterized by five main stages of development:…”

Section: Resultsmentioning

confidence: 95%

“…The geometry of the faults was interpreted from the geometry of the strata, and vice versa. Our interpretations were validated and improved by constructing sequential restorations of the salt related extensional structure (Lopez-Mir, Muñoz, & García-Senz, 2014).…”

Section: Methodsmentioning

confidence: 94%

Geology of the Cotiella thrust sheet, southern Pyrenees (Spain)

2016

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Reconstruction of the Exhumed Mantle Across the North Iberian Margin by Crustal‐Scale 3‐D Gravity Inversion and Geological Cross Section

et al. 2017

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Recent models support the view that the Pyrenees were formed after the inversion of a previously highly extended continental crust that included exhumed upper mantle rocks. Mantle rocks remain near to the surface after compression and mountain building, covered by the latest Cretaceous to Paleogene sequences. 3‐D lithospheric‐scale gravity inversion demands the presence of a high‐density mantle body placed within the crust in order to justify the observed anomalies. Exhumed mantle, having ~50 km of maximum width, continuously extends beneath the Basque‐Cantabrian Basin and along the northern side of the Pyrenees. The association of this body with rift, postrift, and inversion structural geometries is tested in a balanced cross section across the Basque‐Cantabrian Basin that incorporates a major south‐dipping ramp‐flat‐ramp extensional detachment active between Valanginian and early Cenomanian times. Results indicate that horizontal extension progressed ~48 km at variable strain rates that increased from 1 to ~4 mm/yr in middle Albian times. Low‐strength Triassic Keuper evaporites and mudstones above the basement favor the decoupling of the cover with formation of minibasins, expulsion rollovers, and diapirs. The inversion of the extensional system is accommodated by doubly verging basement thrusts due to the reactivation of the former basin bounding faults in Eocene‐Oligocene times. Total shortening is estimated in ~34 km and produced the partial subduction of the continental lithosphere beneath the two sides of the exhumed mantle. Obtained results help to pinpoint the original architecture of the North Iberian Margin and the evolution of the hyperextended aborted intracontinental basins.

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Restoration of basins driven by extension and salt tectonics: Example from the Cotiella Basin in the central Pyrenees

Cited by 49 publications

References 19 publications

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

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

Geology of the Cotiella thrust sheet, southern Pyrenees (Spain)

Reconstruction of the Exhumed Mantle Across the North Iberian Margin by Crustal‐Scale 3‐D Gravity Inversion and Geological Cross Section

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