Oligo-Miocene rotation of Sardinia: KAr ages and paleomagnetic data of Tertiary volcanics

Montigny, R.; Edel, Jean–Bernard; Thuizat, R.

doi:10.1016/0012-821x(81)90009-1

Cited by 167 publications

(74 citation statements)

References 19 publications

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“…Westphal et al, 1976), seismic stratigraphy of pre-rift, syn-rift and post-rift horizons (e.g. Mauffret et al, 1995) age of volcanism in Sardinia (Bellon et al, 1977), paleomagnetic data in Sardinia (Montigny et al, 1981) and Corsica (Vigliotti and Kent, 1990), identification of the magnetic anomalies in the oceanic domain (Burrus, 1984), age of dredged samples in the basin (RŽhault, 1981). We focus here on evidences for age and rate of oceanic spreading leading to quantitative estimates: age of dredged samples, age of magnetic lineations, age and amount of rotation of Sardinia and Corsica rocks derived from paleomagnetism.…”

Section: Rate and Timing Of The Corsicasardinia Block Rotationmentioning

confidence: 99%

“…Westphal et al, 1976), paleomagnetic measurements allowed various determinations of the amount and timing of the rotation. Data used range from paleomagnetic measurements on the Tertiary volcanic rocks of Sardinia (Bellon et al, 1977;Edel and Lšrtscher, 1977;Edel, 1979;Montigny et al, 1981), aeromagnetic measurements over Sardinia (Galdeano and Ciminale, 1987), and finally paleomagnetic study of the Tertiary sediments from Corsica (Vigliotti and Kent, 1990), since Tertiary calc-alkaline volcanism is absent there. Different data sets consistently point to a 30 to 40¡ counterclockwise rotation of the Sardinia-Corsica block with respect to stable Europe.…”

Section: Rate and Timing Of The Corsicasardinia Block Rotationmentioning

confidence: 99%

“…The timing of the rotation, however, remains uncertain. Dating relies both on K-Ar age determinations of the Sardinia andesitic and ignimbritic suite, compiled in Montigny et al (1981), and Miocene fossiferous limestones of the Neogene basins of Corsica (Vigliotti and Kent, 1990). Both sets of data are apparently conflicting.…”

Section: Rate and Timing Of The Corsicasardinia Block Rotationmentioning

confidence: 99%

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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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Section: Rate and Timing Of The Corsicasardinia Block Rotationmentioning

confidence: 99%

Section: Rate and Timing Of The Corsicasardinia Block Rotationmentioning

confidence: 99%

Section: Rate and Timing Of The Corsicasardinia Block Rotationmentioning

confidence: 99%

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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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“…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).…”

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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“…This migration is accompanied is resulting from the retreat of the NW dipping subduction plane of the Adria lithosphere. Since the early Miocene the rifting was followed by the formation of new oceanic crust [125], which caused a counter-clockwise rotation of the Sardinian-Corsican continental block and of the Apennine orogen [126].…”

Section: The Accretion Of the External Ligurian Units: The D3 Deformamentioning

confidence: 99%

The Ligurian Units of Western Tuscany (Northern Apennines): insight on the influence of pre-existing weakness zones during ocean closure

2007

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Oligo-Miocene rotation of Sardinia: KAr ages and paleomagnetic data of Tertiary volcanics

Cited by 167 publications

References 19 publications

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

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

The Ligurian Units of Western Tuscany (Northern Apennines): insight on the influence of pre-existing weakness zones during ocean closure

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