Late Carboniferous dextral wrench-dominated transpression along the North African craton margin (Eastern High-Atlas, Morocco)

Houari, Mohammed-Rachid; Hoepffner, Christian

doi:10.1016/s0899-5362(03)00085-x

Cited by 60 publications

(43 citation statements)

References 39 publications

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“…The onset of a second sedimentary cycle of Middle Cambrian age is marked by transgressive carbonate breccias (''Brèche à Micmacca''), followed by fossiliferous green shales (''Schistes à Paradoxides'') and by the ''Grès du Tabanit'' sandstones (Á lvaro and Clausen 2006). After a Late Cambrian hiatus, clastic sedimentation resumes in Ordovician time with thick alternations of shale and cliff-forming sandstones referred to as ''1st Bani'' and Houari and Hoepffner (2003). (b) Geological sketch map of the study area; EHF El Hart n'Iamine Fault, SAF South Atlas Fault, TBF Tizi n'Boujou Fault, TZF Tazlourt Fault ''2nd Bani'' (Destombes 1976;Hamoumi et al 1994).…”

Section: Stratigraphic Settingmentioning

confidence: 99%

“…The peculiar tectonic setting of this area is classically interpreted as an Appalachian-type fold belt (Michard et al 1982;Helg et al 2004;Toto et al 2008), but reconciling its kinematic characters with a simple compressional deformation model is not straightforward. Major rightlateral displacements of late Variscan age, inferred for instance along the Tizi n'Test Fault (Mattauer et al 1972;Piqué and Michard 1989), contrast with the coeval low-angle thrusting documented in the Tinerhir region (Michard et al 1982) and with the complex deformation pattern observed in the Tamlelt inlier (Houari and Hoepffner 2003). Deformation along the Southern Variscan Front, and the relative position of the Meseta block with respect to the stable West African Craton, are thus key points for reliable Palaeozoic geodynamic reconstructions.…”

Section: Introductionmentioning

confidence: 99%

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Transpressional tectonics and nappe stacking along the Southern Variscan Front of Morocco

Feroni

Ellero

Malusà

et al. 2009

Int J Earth Sci (Geol Rundsch)

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The Southern Variscan Front in the Tinerhir area involves Palaeozoic allochthonous units (Ouaklim and Tilouine units) thrust onto the northern edge of the West African Craton during late Carboniferous time. Illite crystallinity data highlight an anchizonal grade for the Ouaklim Unit, and a diagenesis-anchizone transition for the Tilouine Unit during deformation phase D1. The tectonic stack is crosscut by major dextral reverse faults bounding E-W trending domains of dominant shortening deformation (central domain) and strike-slip deformation (northern and southern domains), later segmented by a network of post-Variscan faults. This complex deformation pattern is the result of kinematic partitioning of dextral transpression along the Southern Variscan Front, coeval with the Neovariscan (300-290 Ma) oblique convergence observed at the scale of the whole Moroccan Variscides. Partitioning of dextral transpression described in the Tinerhir area is consistent with dextral wrench faulting along the Tizi n'Test Fault, and with Appalachian-style south-directed thrusting in the Tinerhir and Bechar-Bou Arfa areas.

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Section: Stratigraphic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transpressional tectonics and nappe stacking along the Southern Variscan Front of Morocco

Feroni

Ellero

Malusà

et al. 2009

Int J Earth Sci (Geol Rundsch)

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“…Ses diverses séries paléozoïques ont ainsi enregistré différemment les effets de l'orogenèse varsique et sont, par consé-quent, subdivisées en plusieurs zones structurales (Michard, 1976;Piqué & Michard, 1981Piqué, 1994) (fig. 1b): i): Le bloc des Sehoul, plissé et granitisé à l'Ordovicien (El Hassani et al, 1991); ii) Le Môle Côtier, où les terrains du Paléozoïque inférieur à moyen sont peu déformés; iii) La Meseta centrale, regroupant les boutonnières du Massif central, des Rehamna, des Jebilet, du massif ancien du Haut Atlas et des Aït Tamelil; iv) les boutonnières de la Meseta orientale caractérisées par une déformation plus précoce à partir du Dévonien supérieur, et enfin; v) les boutonnières méridionales atlasiques de Skoura, de Tamelelt et de Tineghir, qui marquent la transition avec le domaine sud peu déformé de l'Anti-Atlas (Houari & Hoepffner, 2003;Michard et al, 1982;Soulaimani & Burkhard, 2008).…”

unclassified

Tectono-Sedimentary and magmatic evolution of the Upper Visean basins of Azrou-Khénifra and eastern Jebilet (Moroccan Meseta)

Bamoumen¹,

Aarab²,

Soulaı̈mani³

2008

Estud. geol.

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During Upper Visean times, the eastern mesetian basins of eastern Jebilet and Azrou Khenifra show great tectono-sedimentary and magmatic evolution similarities. Their deposits record large instabilities and disorganization with huge thickness and lithological variations, related to a synsedimentary tectonic context. At the same time, tilted block tectonics affect the basement of these basins, controlled by bordering transfert faults. Basic dominant magmatic bodies set up in these basins. Their continental alkaline chemical characteristics are consistent with the regional geodynamic context in this area. Initiated along the transitional zone between eastern and western Meseta, the Azrou-Khenifra and Jebilet basins correspond to intracontinental throws, initiated on and controlled by major strike-slip faults. Their evolution is most likely earlier in time and of a weak opening rate than the neighboring western Meseta basins.

Au Viséen supérieur, les bassins mesetiens des Jebilet orientales et dâ€™Azrou Khénifra montrent de grandes similitudes de leur évolution tectono-sédimentaire et magmatiques. Leurs dépôts enregistrent de grandes instabilités liées à une tectonique syn-sédimentaire responsable localement dâ€™une intense désorganisation et de grandes variations de faciès et dâ€™épaisseurs. Ces instabilités sont engendrées par une tectonique en blocs basculés qui affecte le substratum anté-Viséen, contrôlée par des accidents bordiers sub-verticaux à forte composante transcurrente. Des corps magmatiques, pour lâ€™essentiel basiques, se mettent en place dans ces bassins. Ils présentent des caractères chimiques des séries magmatiques alcalines mise en place dans un contexte intracontinental et anorogénique. Initiés le long de la zone de transition entre la Meseta orientale et occidentale, les bassins dâ€™Azrou-Khénifra et des Jebilet orientales correspondent à des sillons intracontinentaux, initiés et contrôlés par des décrochements. Leur évolution est sans doute plus précoce et montre un faible taux dâ€™ouverture que celui enregistré dans les bassins adjacents de la meseta occidentale

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“…3.16) suggests a dextral displacement of the Meseta Domain along the Anti-Atlas foreland, as M. Mattauer and co-authors noted as early as 1972. Right-lateral movements along the eastern extension of the APTZ have been also observed in the Tamlelt area (Houari and Hoepffner, 2003;Fig. 3.34).…”

Section: Displacements Of the Meseta Domain With Respect To Gondwanamentioning

confidence: 68%

The Variscan Belt

Michard

Hoepffner

Soulaı̈mani

et al.

Lecture Notes in Earth Sciences

103

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Late Carboniferous dextral wrench-dominated transpression along the North African craton margin (Eastern High-Atlas, Morocco)

Cited by 60 publications

References 39 publications

Transpressional tectonics and nappe stacking along the Southern Variscan Front of Morocco

Transpressional tectonics and nappe stacking along the Southern Variscan Front of Morocco

Tectono-Sedimentary and magmatic evolution of the Upper Visean basins of Azrou-Khénifra and eastern Jebilet (Moroccan Meseta)

The Variscan Belt

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