Tectonics and deep structure of the north-western Mediterranean Basin

“…Based on Expanding Spread Profiles (ESP) the average Moho depth in the Liguro-Proven•al Basin and in the Valencia Trough is 15 km (Le Douaran et al 1984;Gallart et al 1990;Danobeitia et al 1992;Mauffret et al 1992;Pascal et al 1992;Pascal et al 1993;Mauffret et al 1995). The Liguro-Proven•al Basin is floored with thin oceanic crust of early Miocene age (Bayer et al 1973;Burrus, 1984), whereas thin continental crust underlies the Valencia Trough TornŽ 1922a, 1992b;Pascal et al 1992).…”

Section: Introductionmentioning

confidence: 99%

“…The exact position of the ocean-continent boundary is however still debated (e.g. Pascal et al 1993;Mauffret et al 1995;review in Vially and TrŽmoli•res, 1996).…”

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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“…This basin evolved in a back-arc position in the tectonic framework of the slow convergence between Africa and Europe, due to a combined effect of the north-westward subduction of the African plate (and its associated slab retreat) and the west-to-east migrating Apenninic arc system (Le Pichon et al, 1971;Montigny et al, 1981;Olivet, 1996;Gueguen et al, 1998). The rifting phase is represented by a short-lived Oligocene-Early Miocene (Aquitanien) crustal thinning, followed by the onset of oceanic crust in response to the counterclockwise rotation of the Corsican-Sardinian continental block, circa between 21 and 15 Ma (Réhault et al, 1984;Gorini et al, 1993;Mauffret et al, 1995;Olivet, 1996;Speranza et al, 2002). The evolution of the margin led to deposition of thick marine deposits (several kilometres) since the end of the Miocene (Gorini et al, 1993;Mauffret et al, 1995).…”

Section: Geological Settingmentioning

confidence: 99%

“…The rifting phase is represented by a short-lived Oligocene-Early Miocene (Aquitanien) crustal thinning, followed by the onset of oceanic crust in response to the counterclockwise rotation of the Corsican-Sardinian continental block, circa between 21 and 15 Ma (Réhault et al, 1984;Gorini et al, 1993;Mauffret et al, 1995;Olivet, 1996;Speranza et al, 2002). The evolution of the margin led to deposition of thick marine deposits (several kilometres) since the end of the Miocene (Gorini et al, 1993;Mauffret et al, 1995). The sedimentary marine series can be simplistically subdivided into three major sedimentary events (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Radial gravitacional gliding indicated by subsalt relief and salt-related structures: the example of the gulf of lions, western mediterranean

Reis¹,

Gorini²,

Weibull³

et al. 2008

Rev. Bras. Geof.

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ABSTRACT. The young Messinian salt basin offshore the Gulf of Lions comprises a shallow décollement layer (maximum of 3.6 km deep) that allows the seismic imaging of the subsalt relief and the correlation between the shape of subsalt relief and gravity-driven structures. The subsalt relief reveals a variable morphology below the salt layer, characterized by both convex and concave shapes, indicating the occurrence of radial gravitational gliding at the scale of the entire Gulf of Lions.Radial gravitational gliding is equally illustrated by the distribution of the Messinian salt layer. The salt isopach map shows overthickened salt mass overlying subsalt relief of concave shape, pointing to a pattern of convergent gliding, and areas of salt thinning (over convex shape of subsalt relief) indicating divergent gliding. Radial gravitational gliding is also reflected by salt-related structures. Families of normal transverse faults striking parallel to the regional dip direction attest the control exerted by components of strike-parallel extension over areas of convex shape of subsalt relief, whereas widespread buckle folds overlying concave shape of subsalt relief indicate the occurrence of a convergent pattern of salt migration and associated translational gliding. The Gulf of Lions provides then an interesting geological setting to focus on gravity tectonics as well as a model to correlate mapped salt-related structures with those predicted by analogue models.Keywords: salt tectonics, radial gravitational gliding, passive margin evolution, basin analysis, marine seismic reflection, Gulf of Lions-France. RESUMO.A bacia evaporítica Messiniana do Golfo de Lion constitui um nível basal móvel bastante raso (∼3.6 km de profundidade), o que facilita o imageamento sísmico da superfície de décollement e a correlação entre tipos de estruturas gravitacionais e a forma do relevo subsalífero. O relevo subsal revela morfologias convexas e côncavas, sugerindo direções radiais regionais de fluxo gravitacional. O deslizamento radialé ainda indicado pelas variações de espessura da camada de sal. Enquanto zonas de superespessamento do sal recobrem regiões côncavas do relevo subsalífero, e indicam padrão de deslizamento convergente; zonas de afinamento da camada de sal recobrem porções convexas da superfície de décollement , indicando um padrão de deslizamento divergente. O padrão de deslizamento radial reflete-se ainda no arcabouço estrutural pela presença de falhas normais transversais e dobramentos nucleados pelo sal. Falhas paralelasà direção de mergulho regional da bacia afetam a cobertura sedimentar sobrejacente aáreas côncavas do relevo subsalífero, atestando a intervenção de componentes de extensão paralela ao strike da margem.Além disso, uma grande concentração de estruturas compressionais afeta a cobertura sedimentar sobrejacente a porções côncavas do relevo subsalífero, atestando um padrão convergente de deslizamento translacional. O Golfo de Lion oferece, deste modo, um interessante cenário para estudos de tectônica gravitac...

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Tectonics and deep structure of the north-western Mediterranean Basin

Cited by 89 publications

References 44 publications

⁴⁰Ar/³⁹Ar dating and paleomagnetism of the Miocene volcanic succession of Monte Furru (Western Sardinia): Implications for the rotation history of the Corsica‐Sardinia Microplate

⁴⁰Ar/³⁹Ar dating and paleomagnetism of the Miocene volcanic succession of Monte Furru (Western Sardinia): Implications for the rotation history of the Corsica‐Sardinia Microplate

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

Radial gravitacional gliding indicated by subsalt relief and salt-related structures: the example of the gulf of lions, western mediterranean

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Tectonics and deep structure of the north-western Mediterranean Basin

Cited by 89 publications

References 44 publications

40Ar/39Ar dating and paleomagnetism of the Miocene volcanic succession of Monte Furru (Western Sardinia): Implications for the rotation history of the Corsica‐Sardinia Microplate

40Ar/39Ar dating and paleomagnetism of the Miocene volcanic succession of Monte Furru (Western Sardinia): Implications for the rotation history of the Corsica‐Sardinia Microplate

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

Radial gravitacional gliding indicated by subsalt relief and salt-related structures: the example of the gulf of lions, western mediterranean

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⁴⁰Ar/³⁹Ar dating and paleomagnetism of the Miocene volcanic succession of Monte Furru (Western Sardinia): Implications for the rotation history of the Corsica‐Sardinia Microplate

⁴⁰Ar/³⁹Ar dating and paleomagnetism of the Miocene volcanic succession of Monte Furru (Western Sardinia): Implications for the rotation history of the Corsica‐Sardinia Microplate