Aspects geochimiques et geochronologiques du volcanisme pyroclastique fore dans le Golfe de Valence: Site 123 DSDP, Leg 13 (Espagne) — Consequences geody-namiques

Rivière, Marc Serge; Bellón, Hervé; Bonnot-Courtois, Chantal

doi:10.1016/0025-3227(81)90086-4

Cited by 19 publications

(6 citation statements)

References 17 publications

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“…Acid-intermediate calc-alkaline volcanic products are recorded in different areas of the Betides, Maghrebides, and Apennines and in the Mediterranean Sea (e.g., the Valencia Trough) and the Corsica-Sardinia block (e.g., Duggen et al 2005;Carminati et al 2010Lustrino et al 2011Lustrino et al , 2013Savelli 2015). All these products may represent potential source areas for volcaniclastites, as inferred from their compatible age and geochemistry (Ryan et al 1972;Bellon 1976Bellon , 1981Bellon and Letouzey 1977;Coulon 1977;Savelli et al 1979;Rivière et al 1981;Bellon et al 1983;Marignac and Zimmermann 1983;Penven and Zimmermann 1986;Hernandez et al 1987;Rivière 1988;Mitjavila et al 1990;Comas et al 1992;Anelli et al 1994;Belanteur et al 1995;Assorgia et al 1997;Morra et al 1997;Rossi et al 1998;Mattioli et al 2000;Scotney et al 2000;Chalouan et al 2001;Downes et al 2001;Mattioli et al 2002;Duggen et al 2004;Lustrino et al 2009;Conte et al 2010;Beccaluva et al 2011Beccaluva et al , 2013Lustrino et al 2011;Réhault et al 2012; table A2).…”

Section: Volcanitesmentioning

confidence: 99%

Geodynamic Implications of the Latest Chattian-Langhian Central-Western Peri-Mediterranean Volcano-Sedimentary Event: A Review

Martı́n-Martı́n

Guerrera

Tramontana

2020

The Journal of Geology

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High amounts of Chattian-Langhian orogenic magmatism have generated volcaniclastic deposits that are interbedded within the penecontemporaneous sedimentary marine successions in several central-western peri-Mediterranean chains. These deposits are widespread in at least 41 units of different basins located in different geotectonic provinces:(1) the Africa-Adria continental margins (external units), (2) the basinal units resting on oceanic or thinned continental crust of the different branches of the western Tethys, (3) the European Margin (external units), and (4) the Western Sardinia zone (Sardinia Trough units). The emplacement of volcaniclastic material in marine basins was controlled by gravity flows (mainly turbidites; epiclastites) and fallout (pyroclastites). A third type comprises volcaniclastic grains mixed with marine deposits (mixed pyroclastic-epiclastic). Calc-alkaline magmatic activity is characterized by a medium-to high-potassium andesite-dacite-rhyolite suite and is linked to complex geodynamic processes that affected the central-western Mediterranean area in the ∼26 to 15 My range. The space/time distribution of volcaniclastites, together with a paleogeographic reconstructions, provide keys and constraints for a better reconstruction of some geodynamic events. Previous models of the central-western Mediterranean area were examined to compare their compatibility with main paleotectonic and paleogeographic constraints presented by the main results of the study. Despite the complexity of the topic, a preliminary evolutionary model based on the distribution of volcaniclastites and active volcanic systems is proposed.

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Section: Volcanitesmentioning

confidence: 99%

Geodynamic Implications of the Latest Chattian-Langhian Central-Western Peri-Mediterranean Volcano-Sedimentary Event: A Review

Martı́n-Martı́n

Guerrera

Tramontana

2020

The Journal of Geology

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“…1) is formed by stretched continental crust with widespread volcanism Torné et al, 1992]. A second phase of volcanism occurred from the Late Miocene to the Quaternary, especially along the transfer zones [Rivière et al, 1981;Marti et al, 1992;Mauffret, 1993, 1999]. A second phase of volcanism occurred from the Late Miocene to the Quaternary, especially along the transfer zones [Rivière et al, 1981;Marti et al, 1992;Mauffret, 1993, 1999].…”

Section: The Western Mediterranean Sub-basinsmentioning

confidence: 99%

Evidence for transform motion along the South Balearic margin and implications for the kinematics of opening of the Algerian basin

Driussi

Briais

Maillard

2015

Bulletin De La Société Géologique De France

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Two major types of kinematic models have been proposed to explain the opening of the western Mediterranean basins (Liguro-Provençal and Algerian basins, and Valencia trough). In one type of models, all continental blocks bounding the basins drift to the southeast, driven by the rollback of the Tethys subduction slab. In the other type of models, the Alboran domain drifts to the southwest, implying a westward rollback of the broken subducting slab and a NE-SW opening of the Algerian basin. In most models, however, the structure of the Balearic promontory was not taken into account, despite its key location at the boundary of the three major basins. We used the interpretation of a large seismic database coupled to gravity and magnetic anomaly analyses to characterize the nature and structure of the South Balearic margin. The constraints brought by the new analyses allow us to suggest a new scenario for the opening of the Algerian basin.Seismic profiles show that the South Balearic margin is composed of four segments with different morphologies and crustal structures. Two segments, the Mazarron and the Emile Baudot escarpments, are characterized by steep scarps and sharp crustal thinning. Two other segments, the South Ibiza and South Menorca margins, have a smoother bathymetry and crustal thinning. We interpret the former in terms of transform margins, and the latter as divergent margins. The distribution of faults on the passive margin segments suggests that they have recorded at least two phases of deformation. A first phase of opening, probably in a NW-SE direction, affected the south Balearic margin, and possibly created some oceanic floor. The existence of the transform margin segments and the prominent NW-SE orientation of the magnetic lineations in the eastern Algerian basin suggest that most of this basin opened in a NE-SW direction, in different oceanic corridors. The two eastern corridors formed by the southwestward drift of the Kabylies. The western corridor, bounded by the transform segments of the South Balearic margin and the Algerian margin, results from the southwestward drift of the Alboran domain, as suggested by previous studies.Résumé. -Deux grands types de modèles cinématiques ont été proposés pour expliquer l'ouverture des bassins de la Méditerranée occidentale (bassins Liguro-Provençal et Algérien et fossé de Valence). Dans un type de modèles, tous les blocs continentaux limitant les bassins dérivent vers le sud-est, tirés par le retrait de la subduction de la plaque téthysienne. Dans l'autre type de modèles, le domaine d'Alboran dérive vers le sud-ouest, impliquant un retrait vers l'ouest de la subduction d'une partie de la plaque téthysienne déchirée. Dans la plupart de ces modèles, cependant, le promontoire Baléares n'est pas pris en compte, et ce, malgré sa position clé à la frontière des bassins majeurs. Nous avons utilisé l'interprétation d'une large base de données sismiques couplée à une analyse des anomalies gravimétriques et magnétiques pour caractériser la nature et la structure de ...

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“…Early refraction experiments showed that the basin was underlain by thinned continental crust (with a thickness of only 12-14 km at its centre) and anomalously low P-wave velocity (V,) mantle (7.2-7.8 km s-'; Hinz 1972;Banda et al 1980). Widespread volcanism, which has been shown to be coeval with the extension of the trough, has been reported from both the commerical drill holes on the Ebro Platform and from DSDP sites 122 and 123 in the centre of the basin (Ryan et al 1973;Riviere, Bellon & Bonnot-Courtois 1981;Lanaja 1987;Marti et al 1990). The basin shows fundamental differences in structural style at its margins.…”

Section: Introductionmentioning

confidence: 99%

Moho and lower crustal reflectivity beneath a young rift basin: results from a two-ship, wide-aperture seismic-reflection experiment in the Valencia Trough (western Mediterranean)

Collier

Buhl

Torné

et al. 1994

Geophysical Journal International

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SUMMARY We present new images of the lower crust and Moho beneath the Valencia Trough—a young rift basin in the western Mediterranean. These images were obtained from a two‐ship, wide‐aperture reflection experiment and show several features not distinguishable on previously available conventional single‐ship reflection profiles. The Moho, which was previously only seen intermittently, can now be confidently traced throughout the basin. We have constructed a present‐day depth‐to‐Moho map and estimated the degree of crustal thinning for the whole basin. Crustal thinning is at a maximum in the centre of the basin, where β values reach 3.15 ± 0.25. At the margins of the basin the β value decreases to 1.5 ± 0.1. The reflective character of the lower crust and Moho is different beneath different parts of the basin. We have been able to correlate these differences with the amount of stretching. We therefore interpret the variations of the observed lower crustal reflectivity as having been caused by the most recent (Neogene) stretching event that opened the Valencia Trough. Along the Iberian margin there is well‐developed lower crustal reflectivity consisting of 1‐2s two‐way time (TWT) of 1‐4 km long, near‐horizontal reflectors underlain by a more continuous, although not significantly stronger, reflector interpreted to be the reflection Moho. Offshore, this lower crustal reflective unit thins rapidly, such that it is undetectable 40‐50 km from the coastline where the crust has been stretched by a factor of 1.7 ± 0.1. As the lower crustal reflectivity becomes undetectable the reflection Moho becomes a robust, continuous event. Where β exceeds 2.4 ± 0.2, however, the Moho is a weak event and difficult to trace. We infer that either the extension itself or associated melting significantly weakened or even destroyed the lower crustal reflectivity in the centre of the basin and enhanced the Moho where extension was moderate. The Balearic margin is somewhat anomalous in that there appears to have been flexural loading of the crust due to thrusting and folding that occurred at the same time as extension in the Valencia Trough. The lower crust shows evidence of weak, but locally variable lower crustal reflectivity. It is possible that the lower crustal reflectivity was preserved simply because the Moho was flexed downward and so decompression, and hence melting, of the upper mantle was restricted. This suggests that the melting itself rather than the extension is the primary mechanism of lower crustal modification.

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Aspects geochimiques et geochronologiques du volcanisme pyroclastique fore dans le Golfe de Valence: Site 123 DSDP, Leg 13 (Espagne) — Consequences geody-namiques

Cited by 19 publications

References 17 publications

Geodynamic Implications of the Latest Chattian-Langhian Central-Western Peri-Mediterranean Volcano-Sedimentary Event: A Review

Geodynamic Implications of the Latest Chattian-Langhian Central-Western Peri-Mediterranean Volcano-Sedimentary Event: A Review

Evidence for transform motion along the South Balearic margin and implications for the kinematics of opening of the Algerian basin

Moho and lower crustal reflectivity beneath a young rift basin: results from a two-ship, wide-aperture seismic-reflection experiment in the Valencia Trough (western Mediterranean)

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