La Marge continentale de la Corse

Gennesseaux, M.; Réhault, Jean-Pierre; Thomas, B.

doi:10.2113/gssgfbull.v.2.339

Cited by 13 publications

(4 citation statements)

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“…In the Provençal basin, the previous outer Pyrenean thrusting may have modified the rheology of the overriding plate and favored the widening of the Gulf of Lion margin during rifting [ Burrus , 1984; Gorini et al , 1993; Séranne , 1999], whereas the western Sardinian margin remained relatively narrow [ Thomas and Gennesseaux , 1986]. Finally, we have shown that a strong volcanic event at the end of the Ligurian basin opening (∼17 Ma) is associated to the Sardinian rift extension up to the SW Corsican margin [ Thomas and Gennesseaux , 1986; Gennesseaux et al , 1989; Guennoc et al , 1995, 1998]. We believe that this second event may explain why this SW Corsican margin segment became wide.…”

Section: Discussionmentioning

confidence: 85%

“…The Malis MCS reflection profiles have been cross‐correlated with other older MCS profiles, i.e., ∼3500 km of seismic sections called MS (OGS Trieste), Augusta, Odyssee, J (Institut Français du Pétrole (IFP)) [see Réhault , 1981; Réhault et al , 1984; Gennesseaux et al , 1989], and SCS profiles acquired on the upper margins [e.g., Réhault , 1981; Bellaiche , 1993; Gaullier , 1993; Chaumillon et al , 1994]. Using all seismic data together, we attempt to draw the structure of the basement of the Ligurian basin and the spatial distribution of the main acoustic units below the sedimentary pile with as many details as possible.…”

Section: Identification Of the Various Domains In The Ligurian Basinmentioning

confidence: 99%

“…On the Corsican margin (Figures 3 and 4) [see Guennoc et al , 1998], we also observe a clear segmentation from north to south into three main parts: (1) the first one, trending roughly N–S to N40°E in the Gulf of Genova up to Cape Corse‐Calvi, is very wide (∼80 km) and corresponds to the offshore continuation of Alpine nappes; (2) the second segment, on the western Corsican margin between Calvi and Ajaccio, is the narrowest (∼40 km) and marks the prolongation of the Hercynian metamorphic basement observed onshore; (3) the third segment trends roughly N160° along the southwestern Corsican margin, and becomes wider (∼80 km) from latitudes 42°00′N to 41°20′N. It may be related to the offshore prolongation of the Sardinian rift toward the north, which developed in the zone of unthickened crust reactivated at the end of the Ligurian opening phase and during a strong postrift magmatic event [ Coulon , 1977; Montigny et al , 1981; Gennesseaux et al , 1989; Carmignani et al , 1995; Rossi et al , 1998]. Therefore this segmentation appears clearly correlated to onshore geological changes (see section 2.3) and thus suggests a clear control of inheritance and rheology on the morphological segmentation of the margins (Figure 3) when compared to other factors like differential erosion or tectonic flexure [ Chaumillon et al , 1994].…”

Section: Segmentation and Style Of Deformation On Conjugate Marginsmentioning

confidence: 99%

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Back arc extension, tectonic inheritance, and volcanism in the Ligurian Sea, Western Mediterranean

et al. 2002

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[1] The Ligurian basin, western Mediterranean Sea, has opened from late Oligocene to early Miocene times, behind the Apulian subduction zone and partly within the western Alpine belt. We analyze the deep structures of the basin and its conjugate margins in order to describe the tectonic styles of opening and to investigate the possible contributions of forces responsible for the basin formation, especially the pulling force induced by the retreating subduction hinge and the gravitational body force from the Alpine wedge. To undertake this analysis, we combine new multichannel seismic reflection data (Malis cruise, 1995) with other geophysical data (previous multichannel and monochannel seismic sections, magnetic anomalies) and constrain them by geological sampling from two recent cruises (dredges from Marco cruise, 1995, and submersible dives from Cylice cruise, 1997). From an analysis of basement morphology and seismic facies, we refine the extent of the different domains in the Ligurian Sea: (1) the continental thinned margins, with strong changes in width and structure along strike and on both sides of the ocean; (2) the transitional domain to the basin; and (3) a narrow, atypical oceanic domain. Margin structures are characterized by few tilted blocks along the narrow margins, where inherited structures seem to control synrift sedimentation and margin segmentation. On the NW Corsican margin, extension is distributed over more than 120 km, including offshore Alpine Corsica, and several oceanward faults sole on a relatively flat reflector. We interpret them as previous Alpine thrusts reactivated during rifting as normal faults soling on a normal ductile shear zone. Using correlations between magnetic data, seismic facies, and sampling, we propose a new map of the distribution of magmatism. The oceanic domain depicts narrow, isolated magnetic anomalies and is interpreted as tholeitic volcanics settled within an unroofed upper mantle, whereas calcalkaline volcanism appears to be discontinuous but massive and has jumped in space and time, from the beginning of rifting on the Ligurian margin ($30 Ma), toward the Corsican margin at the end of the Corsica-Sardinia block rotation ($16 Ma). This space and time shift reveals the importance of the rollback of the Apulian slab and of the migration of the Alpine-Apennines belt front toward the E-SE for driving basin formation. We also state that initial rheological conditions and inherited crustal fabric induce important changes in the styles of deformation observed along margins and between conjugate margins. In the NE Ligurian basin the prerift Alpine crustal thickening together with slow rollback velocity likely contribute to distribute strain across the whole NW Corsican margin, whereas farther south the inherited Hercynian structural pattern combined with a faster rollback of the subducting plate tend to focus the extension at the foot of the margin, up to the Sardinian rift which ends within the SW Corsican margin. Therefore the mode of opening and the margin struct...

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Section: Discussionmentioning

confidence: 85%

Section: Identification Of the Various Domains In The Ligurian Basinmentioning

confidence: 99%

Section: Segmentation and Style Of Deformation On Conjugate Marginsmentioning

confidence: 99%

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Back arc extension, tectonic inheritance, and volcanism in the Ligurian Sea, Western Mediterranean

et al. 2002

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“…2). The Bonifacio Basin is connected to the Castelsardo Basin, which is an aborted rift associated with the opening of the Western Mediterranean during the Oligocene and early Miocene (Cherchi & Montadert, 1982;Thomas & Gennesseaux, 1986;Gennesseaux et al, 1989;Roca et al, 1999;Monaghan, 2001;Casula et al, 2001;Guennoc et al, 2005;Cherchi et al, 2008;Oudet et al, 2010;Fig. 1B).…”

Section: Geological Settingmentioning

confidence: 99%

From non‐tidal shelf to tide‐dominated strait: The Miocene Bonifacio Basin, Southern Corsica

Reynaud¹,

Ferrandini

et al. 2012

Sedimentology

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International audienceThis study documents a change from a non-tidal to tide-dominated shelf system that occurred between Corsica and Sardinia (the Bonifacio Basin, Western Mediterranean) during the early to middle Miocene. The non-tidal deposits formed on a low-energy siliciclastic shelf surrounded by progradational coralline algal ramps at full highstand. The tidal deposits consist of an up to 200 m thick succession of siliciclastic to coralline-rich cross-beds formed by large sub-tidal dunes. Based on outcrop and sub-surface data, it is possible to conclude that the tidal currents were amplified as a consequence of the rapid subsidence of the basin centre due to tectonic activity. It is suggested that this tectonic event initiated the strait between Corsica and Sardinia. The strait was deep enough to allow the tidal flux to be significantly increased, generating a localized strong tidal current at the junction between the Western Mediterranean and the East Corsica Basin

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Structures and tectonic evolution of the external zone of Alpine Corsica

Égal

1992

Journal of Structural Geology

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La Marge continentale de la Corse

Cited by 13 publications

References 0 publications

Back arc extension, tectonic inheritance, and volcanism in the Ligurian Sea, Western Mediterranean

Back arc extension, tectonic inheritance, and volcanism in the Ligurian Sea, Western Mediterranean

From non‐tidal shelf to tide‐dominated strait: The Miocene Bonifacio Basin, Southern Corsica

Structures and tectonic evolution of the external zone of Alpine Corsica

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