Carboniferous normal faults in the Eastern Pyrenees: evidences and age constrains of syn-orogenic Variscan extension

Casas, Josep Maria; Fernández, Òscar; Domingo, F.

doi:10.3166/ga.20.385-392

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…Similarly, the Llavorsi thrust is considered to be a Variscan thrust in some studies (Casas et al, 1989;Clariana, 2001), but an Alpine thrust belonging to the Orri sheet in others studies (Zwart, 1986;Vergés et al, 1995Vergés et al, , 2002. Its subtractive character, placing Devonian over Cambro-Ordovician rocks, has led some authors to consider it as a normal fault, either Early Carboniferous (Capellà & Bou, 1997), or Late Carboniferous to Cretaceous in age (Casas et al, 2007). Further south, the Orri and Nogueres thrusts are indisputably Alpine in age, putting Paleozoic rocks on Permian to Triassic sediments (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Structural inheritance in the Central Pyrenees: the Variscan to Alpine tectonometamorphic evolution of the Axial Zone

Cochelin

Lemirre

Denèle

et al. 2017

JGS

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Estimating structural inheritance in orogens is critical to understand the manner in which plate convergence is accomodated. The Pyrenean belt, which developed in Late Cretaceous to Paleogene times, was affected by Cretaceous rifting and Variscan orogeny. Here we combine a structural and petrological study of the Axial Zone in the Central Pyrenees to discuss structural inheritance. Low-grade Paleozoic metasedimentary rocks were affected by a Variscan transpressional event that produced successively: (i) regional-scale folds; (ii) isoclinal folding, steep pervasive cleavage and vertical stretching, synchronous with peak metamorphism; (iii) and strain localization into ductile reverse shear zones. The persistence of a relative flat envelop for the Paleozoic sedimentary pile and Variscan isograds, and the absence of Alpine crustal-scale faults in the core of the Axial Zone, suggest that the Axial Zone constitutes a large Variscan structural unit preserved during Pyrenean orogeny. This configuration seems to be inherited from Cretaceous rifting, which led to the individualization of a large continental block (future Axial Zone) against a hyper-extended domain along the North Pyrenean Fault zone. This study places the currently prevailing model of Pyrenean belt deformation in a new perspective and bears important implications for crustal evolution and inheritance in mountain belts more generally.

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Section: Geological Settingmentioning

confidence: 99%

Structural inheritance in the Central Pyrenees: the Variscan to Alpine tectonometamorphic evolution of the Axial Zone

Cochelin

Lemirre

Denèle

et al. 2017

JGS

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“…The first transtension-related, undeformed igneous bodies are dated at 310-296 Ma in the External Crystalline Massifs of the Helvetic-Dauphinois domain (Schaltegger and Corfu, 1992;Bussy and von Raumer, 1993;Bussy et al, 2000;Guerrot and Debon, 2000), 320-280 Ma in Sardinia (Oggiano et al, 2005;Oggiano et al, 2007), 307-300 Ma in Corsica (Paquette et al, 2003), 310-293 Ma in the Penninic zone (Bussy and Cadoppi, 1996;Capuzzo and Bussy, 2000), 305 AE 3 Ma in the Eastern Pyrenees (Casas et al, 2007), 303-297 Ma in the Tanneron massif (Demoux et al, 2008) and 290-260 Ma in the Southern Alps (Schaltegger and Brack, 2007).…”

Section: Consequences For Late-variscan Geodynamicsmentioning

confidence: 99%

“…The transform tectonic setting of the north-Gondwana margin Dallagiovanna et al, 2009) could have been responsible for tectonic stacking of units, and kilometre-scale displacement of the Early Carboniferous palaeogeography of the region. Therefore, in present-day cross-sections through the Western Alps, the duplication of the European continental margin (Stampfli, 1993) could provide a useful comparison with syn-orogenic, albeit extension-related magmatism in adjacent regions, as in the Pyrenees (Gilbert et al, 1994;Evans et al, 1998;Casas et al, 2007).…”

Section: Consequences For Late-variscan Geodynamicsmentioning

confidence: 99%

U–Pb zircon geochronological and petrographic constraints on late to post‐collisional Variscan magmatism and metamorphism in the Ligurian Alps, Italy

et al. 2012

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In the Ligurian Alps, the Barbassiria massif (a Variscan basement unit of the Briançonnais domain) is made up of orthogneisses derived from K‐rich rhyolite protoliths and minor rhyolite dykes. However, on account of subsequent Alpine deformation and a related blueschist facies metamorphic overprint that are pervasive within the Barbassiria Orthogneisses, little evidence of the earlier Variscan metamorphism is preserved. In this study, new U–Pb laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) dating of zircon from the Barbassiria Orthogneisses and dykes was undertaken to unravel the relationships between protolith magmatism and the Variscan metamorphic overprint. The results suggest a protolith age for the Barbassiria Orthogneisses of ~315–320 Ma (i.e., Early/Late Carboniferous), and constrain the age of a subsequent rhyolite dyke emplacement event to 260.2 ± 3.1 Ma (i.e., Late Permian). The Variscan high‐temperature (greenschist–amphibolite facies) metamorphic event that affected the Barbassiria Orthogneisses was likely associated with both tectonic burial and compression during the final stages of the Variscan collision during the Late Carboniferous period. Emplacement of late‐stage rhyolite dykes that cut the Barbassiria Orthogneisses is linked to a diffuse episode of Late Permian rhyolite volcanism that is commonly observed in the Ligurian Alps. The age of this dyke emplacement event followed a ~10–15 Ma Mid‐Permian gap in the volcano‐sedimentary cover sequence of the Ligurian Alps, and represents the post‐orogenic stage in this segment of the Variscides. Copyright © 2012 John Wiley & Sons, Ltd.

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“…The southern cluster hypocenters, located at less than 1.5 km of the fault trace, could be associated to the Meranges fault plane, considering that major fault zones, especially those of lateral faults, are complex and may be several kilometers thick (Burbank and Anderson, 2011). However, this seismicity cluster can also be related to the normal reactivation of the minor alpine thrusts that have been mapped to the SW of this cluster, with variable dips to the NE (ICGC, 2006;Casas et al, 2007). The orientation of the nodal planes (number 9 and 10 in Figs.…”

Section: Seismic Activity Around the Cerdanya Basinmentioning

confidence: 99%

Seismic Activity at the Eastern Pyrenean Termination

Ruiz¹,

Díaz²,

Canari³

et al. 2023

SSRN Journal

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Carboniferous normal faults in the Eastern Pyrenees: evidences and age constrains of syn-orogenic Variscan extension

Cited by 10 publications

References 14 publications

Structural inheritance in the Central Pyrenees: the Variscan to Alpine tectonometamorphic evolution of the Axial Zone

Structural inheritance in the Central Pyrenees: the Variscan to Alpine tectonometamorphic evolution of the Axial Zone

U–Pb zircon geochronological and petrographic constraints on late to post‐collisional Variscan magmatism and metamorphism in the Ligurian Alps, Italy

Seismic Activity at the Eastern Pyrenean Termination

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