A review of cretaceous smooth-slopes extensional basins along the Iberia-Eurasia plate boundary: How pre-rift salt controls the modes of continental rifting and mantle exhumation

Lagabrielle, Yves; Asti, Riccardo; Duretz, Thibault; Clerc, Camille; Fourcade, Serge; Teixell, Antonio; Labaume, Pierre; Corre, Benjamin; Saspiturry, Nicolas

doi:10.1016/j.earscirev.2019.103071

Cited by 48 publications

(71 citation statements)

References 121 publications

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“…This bimodal deformation style was linked to the basinward increase in the thermal gradient and burial of the central basin under thick sedimentary cover. The movement of the thick prerift sedimentary cover and synrift sediments into the hyperextended domain, aided by salt tectonics, accentuated the existing thermal gradient and led to ductile thinning of the upper continental crust under high‐temperature/low‐pressure metamorphic conditions at temperatures higher than 450°C (Lagabrielle et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Paleogeothermal Gradients Across an Inverted Hyperextended Rift System: Example of the Mauléon Fossil Rift (Western Pyrenees)

et al. 2020

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The fossil rift in the North Pyrenean Zone, which underwent high temperature-low pressure metamorphism and alkaline magmatism during Early Cretaceous hyperextension, was studied to explore the geothermal regime at the time of rifting. In this work, we combined Raman lab analysis and thermal numerical modelling to shed light on the distribution of geothermal gradients across the inverted hyperextended Mauléon rift basin during Albian and Cenomanian time, its period of active extension. Data were acquired from a set of 155 samples from densely spaced outcrops and boreholes, analyzed using Raman spectroscopy of carbonaceous material. The estimated paleogeothermal gradient is strongly related to the structural position along the Albian-Cenomanian rift, increasing along a proximal-distal margin transect from~34°C/km in the European proximal margin to~37-47°C/km in the two necking zones and 57-60°C/km in the hyperextended domain. This pattern of the paleogeothermal gradient induced a complex interaction between brittle and ductile deformation during crustal extension. A numerical model reproducing the thermal evolution of the North Pyrenees since 120 Ma suggests that mantle heat flow values may have reached 100 mW/m 2 during the rifting event. This model reveals that above the thermal pulse, the temperature gradient varied within a small range of 55 to 62°C/km, as inferred from RSCM peak temperatures. We demonstrate that the style of reactivation during subsequent convergence influenced the thermal structure of the inverted rift system.

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Section: Discussionmentioning

confidence: 99%

Paleogeothermal Gradients Across an Inverted Hyperextended Rift System: Example of the Mauléon Fossil Rift (Western Pyrenees)

et al. 2020

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“…Despite the requirement of such large movements in the Iberian Range geological evidence are lacking. This likely reflect the role played by the Triassic evaporites that decouples the large extension in the pre-salt basement from thinskinned extension in sedimentary cover as shown around Iberia by numerical studies (e.g., Grool et al, 2019;Duretz et al, 2019;Jourdon et al, 2020;Lagabrielle et al, 2020). 8 https://doi.org/10.5194/se-2020-24 Preprint.…”

Section: Late Jurassic-early Cretaceous (160-100 Ma)mentioning

confidence: 97%

A reconstruction of Iberia accounting for W-Tethys/N-Atlantic kinematics since the late Permian-Triassic

Angrand¹,

Mouthereau²,

Masini³

et al. 2020

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Abstract. The West European kinematic evolution results from the opening of the West Neotethys and the Atlantic oceans since the late Paleozoic and the Mesozoic. Geological evidence shows that the Iberian domain well preserved the propagation of these two rift systems and is therefore key to significantly advance our understanding of the regional plate reconstructions. The Late Permian-Triassic tectonic evolution of Iberian rift basins shows that they have accommodated significant extension, but this tectonic stage is often neglected in most plate kinematic models, leading to the overestimation of the movements between Iberia and Europe during the subsequent Mesozoic (Early Cretaceous) rift phase. By compiling existing seismic profiles and geological constraints along the North Atlantic margins, including well data over Iberia, as well as recently published kinematic and paleogeographic reconstructions we propose a coherent kinematics model of Iberia that considers both the Neotethyan and Atlantic evolutions. Our model shows that the Europe-Iberia plate boundary was a domain of distributed and oblique extension made of two rift systems, in the Pyrenees and in the Iberian intra-continental basins. It differs from standard models that consider left-lateral strike-slip movement localized only in the northern Pyrenees in introducing a significant strike-slip movement south of Ebro accounting for Late Permian-Triassic extension and by emphasizing the need for an Ebro microcontinent. At a larger scale it emphasizes the role played by the late Permian-Triassic rift and magmatism, as well as strike-slip faulting in the evolution of the western Neotethyan Ocean and their control on localization of the Atlantic rift.

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“…Cretaceous exhumation of mantle rocks and associated thermal events have been attributed either to transtensional rifting (e.g. Choukroune and Mattauer 1978;Debroas 1990;Golberg and Leyreloup 1990;Choukroune 1992;Lagabrielle and Bodinier 2008) or, more recently, to pure shear hyper-extension (Jammes et al 2009(Jammes et al , 2010aLagabrielle et al 2010Lagabrielle et al , 2016Lagabrielle et al , 2020Clerc 2012Masini et al 2014;Tugend et al 2014Tugend et al , 2015 de Saint Blanquat et al 2016). Table 1.)…”

Section: Pyrenean Orogenmentioning

confidence: 99%

“…In these pure shear models, the extending plate boundary is configured as a region of progressive and ductile crustal thinning involving minor normal faults in the upper crust. Lagabrielle et al (2020) argue that Upper Triassic evaporites play a crucial role in 'smoothslope' basin evolution by facilitating the gliding of suprasalt sediments downward into the basin centre where they pile up on exhumed mantle. Our detailed observations in the eastern Pyrenees, in contrast, seem to indicate a different history, recording a twophase transtensional rifting evolution on asymmetrical margins.…”

Section: Plate Kinematic Models For the Iberia-europe Plate Boundarymentioning

confidence: 99%

Evolution of a salt-rich transtensional rifted margin, eastern North Pyrenees, France

Ford

Vergés

2020

JGS

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In this field study we reinterpret the narrow eastern North Pyrenean Zone, France, as an inverted salt-rich transtensional rift system based on identification of halokinetic depositional sequences across rift platform to distal rift margin domains with a cumulative throw of >2.8 km on steep Cretaceous faults. The rift platform records extension on detached rotational faults above Triassic evaporites from Jurassic to Aptian with uplift and erosion during the Albian. Transtensional Aptian–Albian minibasins align along the salt-rich rift margin fault zone. In the Aptian–Albian main rift large en echelon synclinal minibasins developed between salt walls, although Jurassic diapiric evolution is likely. Upper Cretaceous units locally record continuing diapirism. The Boucheville and Bas Agly depocentres, altered by synrift HT metamorphism, form the distal rift domain terminating south against the North Pyrenean Fault. The narrowness of the Pyrenean rift, shape of minibasins, en echelon oblique synclinal depocentres and folds coupled with a discontinuous distribution and intensity of HT metamorphism support a transtensional regime along the Iberia–Europe plate margin during late Early and early Late Cretaceous. In this model, the distal European margin comprises deep faults limiting laterally discontinuous crustal domains and ‘hot’ pull-apart basins with mantle rocks directly beneath sedimentary cover.Supplementary material: A table summarizing the stratigraphy of the NE Pyrenees and an interpreted Google Earth view of the Quillan syncline and minibasin are available at https://doi.org/10.6084/m9.figshare.c.5100036

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A review of cretaceous smooth-slopes extensional basins along the Iberia-Eurasia plate boundary: How pre-rift salt controls the modes of continental rifting and mantle exhumation

Cited by 48 publications

References 121 publications

Paleogeothermal Gradients Across an Inverted Hyperextended Rift System: Example of the Mauléon Fossil Rift (Western Pyrenees)

Paleogeothermal Gradients Across an Inverted Hyperextended Rift System: Example of the Mauléon Fossil Rift (Western Pyrenees)

A reconstruction of Iberia accounting for W-Tethys/N-Atlantic kinematics since the late Permian-Triassic

Evolution of a salt-rich transtensional rifted margin, eastern North Pyrenees, France

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