Main results of the ECORS Pyrenees profile

Cartigny, Pierre; Roure, François; Pinet, B.

doi:10.1016/0040-1951(90)90234-y

Cited by 80 publications

(43 citation statements)

References 21 publications

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“…2). The Pyrenees forms the border between Eurasia and the Iberian Peninsula microplate, trending ESE-WNW, and represents a doubly verging continental collision orogen (Choukroune et al, 1990;Muñoz, 1992;Teixell, 1998). The Alpine structures of the Cantabrian Mountains can be divided, based on involved lithologies, age and deformational style, into two regions: the VascoCantabrica (VC) in the E and the Astur-Galaica (AG) in the W (Martín-González and Heredia, 2011b) In the Astur-Galaica region, the overall Alpine structure is a regional monoclinal flexure that corresponds to the back-limb of a major fault-bend fold related to the Cantabrian Basal Thrust (CBT).…”

Section: Geological and Tectonic Settingmentioning

confidence: 99%

Seismicity and potencially active faults in the Northwest and Central-West Iberian Peninsula

Martín-González

Antón

Arévalo

et al. 2012

Journal of Iberian Geology

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The Northwest and Central-West Iberian Peninsula configure an intraplate area far from the active plate boundaries, where the Variscan basement crops out extensively (Iberian Massif). This area of the Iberian Peninsula has been traditionally considered a seismically stable region; however, it presents a moderate intraplate seismicity which indicates the presence of active structures and the occurrence of potentially damaging earthquakes. The scarcity of Mesozoic and Cenozoic deposits makes very difficult to track the record of the more recent tectonic activity and the characterization of active tectonic structures within the Iberian Massif. Nevertheless the seismic sequences of 1995-1997 in Lugo (5.1 mb; IV) and 2003 in Zamora (4.2 Mw) provided important information about the orientation of the present stress tensor, and the distribution of the hypocenters informed about the rupture geometry of the fault planes. The present work integrates geological, geomorphological, structural, and seismological data in order to define the main potentially active faults in the region. Faults trending NE-SW to N-S are potentially active as strike-slip, in some cases with a reverse component, under a NW-SE to N-S compression.

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Section: Geological and Tectonic Settingmentioning

confidence: 99%

Seismicity and potencially active faults in the Northwest and Central-West Iberian Peninsula

Martín-González

Antón

Arévalo

et al. 2012

Journal of Iberian Geology

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“…the PyrŽnŽes belt (Choukroune et al 1989(Choukroune et al , 1990Anguy et al 1991) and to 55-60 km beneath the Alps (Giese et al 1973). Beneath the Balearic Islands the Moho lies at an average depth of 22 km (18 km under Menorca after Banda et al 1980; 24 to 28 km under Mallorca after Danobeitia et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Constraints on Moho Depth and Crustal Thickness in the Liguro-Provençal Basin from a 3d Gravity Inversion : Geodynamic Implications

Gaulier

Chamot‐Rooke

Jestin

1997

Rev. Inst. Fr. Pét.

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Ce rapport prŽsente un travail commun avec le Laboratoire de gŽodynamique de lÕƒcole normale supŽrieure (ENS). Ce travail doit •tre resituŽ dans son contexte : lÕŽtude rŽgionale du golfe du Lion a ŽtŽ possible dans le cadre du projet europŽen Integrated Basin Studies. Le dŽveloppement du code dÕinversion 3D avait fait lÕobjet de conventions avec lÕENS pendant les annŽes prŽcŽdentes. La mise en Ïuvre dÕune telle inversion est dŽsormais possible ˆ lÕIFP. Il nÕy a pas dÕinterface pour ce calculateur. LÕaide des coll•gues de lÕENS est souhaitable pour la mise en forme des donnŽes.Il a paru opportun, compte tenu des dŽlais imprŽvus de publication du volume du BSGL* pour lequel cet article a ŽtŽ acceptŽ, de montrer lÕexistence et les potentialitŽs de cette mŽthode. Il est vraisemblable quÕelle pourra •tre un apport significatif ˆ lÕŽtude des marges passives et plus particuli•rement dans le cas des Žtudes concernant lÕoffshore profond. Elle a dŽjˆ retenu lÕattention de plusieurs coll•gues de lÕindustrie pŽtroli•re. CONSTRAINTS ON MOHO DEPTH AND CRUSTAL THICKNESS IN THE LIGURO-PROVEN‚AL BASIN FROM A 3D GRAVITY INVERSION: GEODYNAMIC IMPLICATIONS3D gravity modelling is combined with seismic refraction and reflection data to constrain a new Moho depth map in the LiguroProven•al Basin (Western Mediterranean Sea). At seismically controlled points, the misfit between the gravimetric solution and the seismic data is about 2 km for a range of Moho depth between 12 km (deep basin) and 30 km (mainlands). The oceanic crust thickness in the deep basin (5 km En este informe se presenta un trabajo comoen llevado a cabo conjuntamente con el Laboratorio de geodin ‡mica de la Escuela Normal Superior (ENS). Este trabajo se debe restituir en su contexto propio : el estudio regional del Golfo de Le-n ha resultado posible en el marco del proyecto europeo Integrated Basin Estudies. El desarrollo del c-digo de inversi-n 3D fue objeto de convenciones con la ENS durante los a-os precedentes. La implementaci-n de semejante inversi-n resulta ahora posible por parte del IFP. No existe ningoen interfaz para este calculador. La ayuda de los colegas de la ENS es deseable para la conformaci-n de los datos.Habida cuenta de los plazos imprevistos para la publicaci-n del volumen del BSGL, para el cual se ha aceptado este art'culo, ha parecido oportuno mostrar su existencia, as' como las potencialidades de este mŽtodo. Parece veros'mil que podr ‡ de este modo, constituir una aportaci-n significativa para el estudio de los m ‡rgenes pasivos y, en particular, en el caso de los estudios costafuera profundos. Su contenido ha sido objeto de atenci-n por parte de varios colegas de la industria petrolera.

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“…The Pyrenees correspond to a doubly vergent orogenic prism formed during the convergence between Iberia and Europe from the late Cretaceous to the early Miocene (e.g., Choukroune et al 1990;Munoz 1992;Teixell 1998;and Beaumont et al 2000).…”

Section: Geological Settingmentioning

confidence: 99%

Formation of chlorite during thrust fault reactivation. Record of fluid origin and P–T conditions in the Monte Perdido thrust fault (southern Pyrenees)

Lacroix

Charpentier

Buatier

et al. 2012

Contrib Mineral Petrol

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The chemical and isotopic compositions of clay minerals such as illite and chlorite are commonly used to quantify diagenetic and low-grade metamorphic conditions, an approach that is also used in the present study of the Monte Perdido thrust fault from the South Pyrenean fold-and-thrust belt. The Monte Perdido thrust fault is a shallow thrust juxtaposing upper Cretaceous-Paleocene platform carbonates and Lower Eocene marls and turbidites from the Jaca basin. The core zone of the fault, about 6 m thick, consists of intensely deformed clay-bearing rocks bounded by major shear surfaces. Illite and chlorite are the main hydrous minerals in the fault zone. Illite is oriented along cleavage planes while chlorite formed along shear veins (\50 lm in thickness). Authigenic chlorite provides essential information about the origin of fluids and their temperature. d18 O and dD values of newly formed chlorite support equilibration with sedimentary interstitial water, directly derived from the local hanging wall and footwall during deformation. Given the absence of largescale fluid flow, the mineralization observed in the thrust faults records the P-T conditions of thrust activity. Temperatures of chlorite formation of about 240°C are obtained via two independent methods: chlorite compositional thermometers and oxygen isotope fractionation between cogenetic chlorite and quartz. Burial depth conditions of 7 km are determined for the Monte Perdido thrust reactivation, coupling calculated temperature and fluid inclusion isochores. The present study demonstrates that both isotopic and thermodynamic methods applied to clay minerals formed in thrust fault are useful to help constrain diagenetic and low-grade metamorphic conditions.

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Main results of the ECORS Pyrenees profile

Cited by 80 publications

References 21 publications

Seismicity and potencially active faults in the Northwest and Central-West Iberian Peninsula

Seismicity and potencially active faults in the Northwest and Central-West Iberian Peninsula

Constraints on Moho Depth and Crustal Thickness in the Liguro-Provençal Basin from a 3d Gravity Inversion : Geodynamic Implications

Formation of chlorite during thrust fault reactivation. Record of fluid origin and P–T conditions in the Monte Perdido thrust fault (southern Pyrenees)

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