Searching for the Africa–Eurasia Miocene boundary offshore western Algeria (MARADJA'03 cruise)

Domzig, A.; Yelles, K.; Roy, Charlotte Le; Déverchère, Jacques; Bouillin, Jean-Pierre; Bracène, Rabah; Lépinay, Bernard Mercier de; Roy, Pascal Le; Calais, E.; Kherroubi, A.; Gaullier, Virginie; Savoye, Bruno; Pauc, Henri

doi:10.1016/j.crte.2005.11.009

Cited by 102 publications

(156 citation statements)

References 40 publications

(88 reference statements)

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“…This gives an approximate westernmost location for the western boundary of the Alboran block before its migration. This proposal is quite close to the proposal by Domzig et al (2006) based on seismic and bathymetry data.…”

Section: "Collision" and Lateral Slab Tearing Along The African Marginmentioning

confidence: 53%

“…In the Tell offshore, high resolution seismic data reveal a set of young or still active fault-related folds at the toe of the Central and Eastern Algerian margin interpreted as the trace of a possible subduction initiation of the young Algerian Basin beneath Africa (Déverchère et al, 2005;Domzig et al, 2006;Kherroubi et al, 2009). If correct, it should represent the inception of a new slab reversal after the one occurring at 35 Ma after the closure of the western Ligurian Tethys.…”

Section: The Late Tortonian-pliocene-to-present (R) Evolutionmentioning

confidence: 99%

“…3). Offshore studies by Domzig et al (2006) show that the internal zones and the flyschs extend up to some distance offshore (Fig. 2) but the major part of this disruption is of tectonic origin, due to the post-Early Miocene motions of the westernmost part of the AlKaPeCa domain (mostly the Alboran microdomain).…”

Section: The Alkapeca and Flyschs Domainsmentioning

confidence: 99%

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The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

Leprêtre

Lamotte

Combier

et al. 2018

BSGF - Earth Sci. Bull.

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-The Tell-Rif (Tell in Algeria and Tunisia; Rif in Morocco) is the orogenic system fringing to the south the West Mediterranean basins. This system comprises three major tectonic-palaeogeographic zones from north to south: (1) the internal zones (AlKaPeCa for Alboran, Kabylies, Peloritan, Calabria) originating from the former northern European margin of the Maghrebian Tethys, (2) the "Flyschs zone" regarded as the former cover of the oceanic domain and (3) the external zones, forming the former southern Maghrebian Tethys margin more or less inverted. The Tell-Rif is interpreted as the direct result of the progressive closure of the Maghrebian Tethys until the collision between AlKaPeCa and Africa and, subsequently, the propagation of the deformation within Africa. This gives a consistent explanation for the offshore Neogene geodynamics and most authors share this simple scenario. Nevertheless, the current geodynamic models do not completely integrate the Tell-Rif geology. Based on the analysis of surface and sub-surface data, we propose a reappraisal of its present-day geometry in terms of geodynamic evolution. We highlight its non-cylindrical nature resulting from both the Mesozoic inheritance and the conditions of the tectonic inversion. During the Early Jurassic, we emphasize the development of NE-SW basins preceding the establishment of an E-W transform corridor connecting the Central Atlantic Ocean with the Ligurian Tethys. The Maghrebian Tethys developed just after, as the result of the Late Jurassic-Early Cretaceous left-lateral spreading between Africa and Iberia. By the Late Cretaceous, the occurrence of several tectonic events is related to the progressive convergence convergence between the two continents. A major pre-Oligocene (pre-35 Ma) compressional event is recorded in the Tell-Rif system. The existence of HP-LT metamorphic rocks associated with fragments of mantle in the External Metamorphic Massifs of the Eastern Rif and Western Tell shows that, at that time, the western part of the North-African margin was involved in a subduction below a deep basin belonging to the Maghrebian Tethys. At the same time, the closure of the West Ligurian Tethys through east-verging subduction led to a shift of the subduction, which jumped to the other side of AlKaPeCa involving both East Ligurian and Maghrebian Tethys. Slab rollback led to the development of the Oligo-Miocene back-arc basins of the West-Mediterranean, reworking the previous West Ligurian Tethys suture. The docking of AlKaPeCa against Africa occurred during the Late Burdigalian (17 Ma). Subsequently, the slab tearing triggered westward and eastward lateral movements that are responsible for the formation of the Gibraltar and Tyrrhenian Arcs respectively. The exhumation of the External Metamorphic Massifs occurred through tectonic underplating during the westward translation of the Alboran Domain. It resulted in the formation of both foredeep and wedge-top basins younger and younger westward. The lack of these elements in the eastern part ...

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Section: "Collision" and Lateral Slab Tearing Along The African Marginmentioning

confidence: 53%

Section: The Late Tortonian-pliocene-to-present (R) Evolutionmentioning

confidence: 99%

See 1 more Smart Citation

The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

Leprêtre

Lamotte

Combier

et al. 2018

BSGF - Earth Sci. Bull.

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“…Several sedimentary basins are bounded by the base of the slope and the deep escarpments (D1, D2, D3 and D4 in Fig. 1) (Déverchère et al 2005;Domzig et al 2006). In this work, slope stability assessment will be conducted on the escarpment delimited by the S1 slope break, which seems to be significantly affected by slope instabilities (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…According to Domzig et al (2006), the basement of the study area is composed of Oligo-Miocene sediments or flyschs units and probably volcanic deposits. West 5 of Algiers, in Khayr al Din bank, the basement probably corresponds to a relict of the Kabylian basement, like nearby Algiers massif.…”

Section: Geological Settingmentioning

confidence: 99%

Quantifying the role of sandy–silty sediments in generating slope failures during earthquakes: example from the Algerian margin

Dan

Sultan

Savoye

et al. 2008

Int J Earth Sci (Geol Rundsch)

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Abstract:The Algerian margin is a seismically active region, where during the last century, several large magnitude earthquakes took place. This study combines geotechnical and sedimentological data with numerical modelling to quantitatively assess the present-day slope stability of the Algerian margin. Geotechnical laboratory tests, such as cyclic triaxial tests, oedometric tests and vane shear tests were carried out on sediment cores collected on the study area. The liquefaction potential of a sediment column located about 30 km from the Boumerdès earthquake epicentre of 21st May 2003 was evaluated theoretically for an earthquake of M w = 6.8. We show that thin sand and silt beds such as those described on recovered sediment cores are the main cause of sediment deformation and liquefaction during earthquakes. Numerical calculations showed that the slope failure may occur during an earthquake characterised by a PGA in excess of 0.1g, and also that, under a PGA of 0.2g liquefaction could be triggered in shallow silty-sandy deposits. Moreover, comparison of the predicted slope failure with failure geometries inferred from seafloor morphology showed that earthquakes and subsequent mass movements could explain the present-day morphology of the study area.

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Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)

et al. 2015

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Interpretation of new multichannel seismic reflection profiles indicates that the Palomares margin was formed by crustal-scale extension and coeval magmatic accretion during middle to late Miocene opening of the Algero-Balearic basin. The margin formed at the transition between thinned continental crust intruded by arc volcanism and back-arc oceanic crust. Deformation produced during the later positive inversion of the margin offshore and onshore is partitioned between~N50°E striking reverse faults and associated folds like the Sierra Cabrera and Abubacer anticlines and N10-20°E sinistral strike-slip faults like Palomares and Terreros faults. Parametric subbottom profiles and multibeam bathymetry offshore, structural analysis, available GPS geodetic displacement data, and earthquake focal mechanisms jointly indicate that tectonic inversion of the Palomares margin is currently active. The Palomares margin shows a structural pattern comparable to the north Maghrebian margins where Africa-Eurasia plate convergence is accommodated by NE-SW reverse faults, NNW-SSE sinistral faults, and WNW-ESE dextral ones. Contractive structures at this margin contribute to the general inversion of the Western Mediterranean since~7 Ma, coeval to inversion at the Algerian margin. Shortening at the Alboran ridge and Al-Idrisi faults occurred later, since 5 Ma, indicating a westward propagation of the compressional inversion of the Western Mediterranean.

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Searching for the Africa–Eurasia Miocene boundary offshore western Algeria (MARADJA'03 cruise)

Cited by 102 publications

References 40 publications

The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

Quantifying the role of sandy–silty sediments in generating slope failures during earthquakes: example from the Algerian margin

Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)

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