Un grand decrochement Est-Ouest au Nord du Maroc, a l'origine des structures plissees atlasiques; Arguments geologiques et experimentaux

Courbouleix, Serge; Delpont, G.; Destaucq, C.

doi:10.2113/gssgfbull.s7-xxiii.1.33

Cited by 14 publications

(5 citation statements)

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“…The Eocene folding is the expression of a surficial deformation induced by right-lateral motions of the basement along a n WSW-ENE wrench zone. This result is coherent with the model proposed for the Moroccan High Atlas (Courbouleix et al, 1981) and for the Tunisian Atlas (Caire, 1978). This implies that the Saharan Atlas acted…”

Section: Discussionsupporting

confidence: 90%

“…Similar structures were detected on enlarged satellite images all along the Algerian Atlas, and it is likely that the whole Algerian Atlas acted as a rightlateral shear zone during the Eocene. Such kinematics and style of deformation may be related to the right-lateral transcurrent model proposed both for the Moroccan High Atlas (Courbouleix et al, 1981) and for the Tunisian Atlas (Marino and Tibaldi, 1986;Bedir and Robier, 1987). Recognizing this model for the entire Saharan Atlas implies that this acted as a major diachronous intracontinental shear zone during the Jurassic-Cenozoic time interval.…”

Section: R E G Ion Al Kin E M a T I Csmentioning

confidence: 94%

“…Right-lateral movements began during Middle Jurassic in Morocco (Fig. 7A) (Courbouleix et al, 1981;Studer, 1987), extended eastwards in Algeria in Eocene times (Fig. 7B), and were prominent in Tunisia during the Latest Oligocene-Miocene ( Fig.…”

Section: R E G Ion Al Kin E M a T I Csmentioning

confidence: 99%

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Eocene simple shear and plio‐quaternary pure‐shear folding in the Central‐Eastern Algerian Atlas

et al. 1990

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Tertiary folds of the central and eastern part of the Algerian Atlas were studied in order to assess their kinematics and regimes of deformation. Folds developed following two main phases of deformation during the Eocene and the Pliocene. The NE-SW trending Eocene folds show a clockwise rotation of fold axis with depth, noncylindrical geometry and a right-stepping en echelon configuration. Early secondary structures inside each fold are also rotated clockwise with respect to the younger folds. These data are in agreement with progressive 'simple shear' deformation. Pliocene folds strike E-W and display a cylindrical geometry. Associated Plio-Quaternary brittle structures show no rotational path. These observations are compatible with 'pure shear' style of deformation. These results, in combination with focal mechanism solutions, have important implications for the understanding of the kinematic evolution of the western segment of the African-European plate boundary. For Algeria they imply that transcurrent motion during the Paleogene was followed by coaxial shortening with a NNW direction during Neogene-Quaternary times. Comparison with published data for Morocco and Tunisia suggests that this transcurrent regime developed from west to east continuing from the Middle Jurassic through to the Miocene. Terra Nova, 2,653-660

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Section: Discussionsupporting

confidence: 90%

Section: R E G Ion Al Kin E M a T I Csmentioning

confidence: 94%

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Eocene simple shear and plio‐quaternary pure‐shear folding in the Central‐Eastern Algerian Atlas

et al. 1990

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“…One of the earliest models explaining the deformations of the Atlas chain was proposed by Courbouleix et al 1981. These authors found from the statistics of the orientation of the High Atlas fold axes (ENE-WSW) with respect to the general trend of the chain (ENE-WSW to E-W), and from analog modeling, that the structures were generated by a general E-W dextral shear north of the Middle Atlas.…”

Section: Previous Modelsmentioning

confidence: 99%

The Midelt earthquake of November 17th 2019, and its implications on the present-day tectonics of the junction of the High and Middle Atlas (Morocco)

Medina

Cherkaoui

2021

Arab J Geosci

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The Midelt area in Morocco, located between the Middle Atlas and the High Atlas, was shaken on November 17th, 2019, by a strong earthquake that was felt with intensity VI MSK. The epicenter was at 32.677°N; 4.126°W, with a depth of 2.1 km. The event was followed by a series of aftershocks and another series of small events later in February 2020. Moment tensors of the main event mainly show strike-slip faulting with a P-axis oriented NW-SE. The review of the available seismic data around the epicentral area encompassing the Middle Atlas, the Eastern High Atlas, and the Missour basin shows three main clusters located in the Southern Middle Atlas, the north-eastern Middle Atlas, and the Central High Atlas, while the Missour basin is almost devoid of seismic activity. The available focal mechanisms and moment tensors show various tectonic regimes, mainly transpression and thrusting, while the Tabular Middle Atlas is undergoing transtension. Detailed review of neotectonic data leads to the conclusion that the area is tectonically active, as witnessed by the deformations of the Mio-Plio-Quaternary foreland formations especially at the master border faults. The review of all data including GPS measurements shows good accordance between tectonics, seismicity, and block motions with respect to fixed Nubia. Transtension in the Tabular Middle Atlas may be explained by a change of kinematics across the Northern Middle Atlas Fault. Comparison of various models set for the Eastern Meseta suggests that the whole area from the Anti-Atlas to the Tabular Middle Atlas is undergoing transpression and/or shortening.

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“…During early to middle Tertiary time, the western Tethys Ocean began to close in conjunction with inversion of the Atlas Basin in the early Eocene (Courbouleix et al 1981;Laville 1981;Vially et al 1994). This inversion was coeval with the early collision of the African and European plates (i.e., Kabylie Block; Macgregor 1998).…”

Section: Alpine Orogenymentioning

confidence: 99%

Geologic and Metallogenic Framework of North Africa

Bouabdellah

Slack

2016

Mineral Deposits of North Africa

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North Africa is noteworthy for having a great diversity of geology and mineral resources. Geologically, the region contains numerous terranes that contain rocks ranging in age from Archean to Quaternary, including diverse igneous, sedimentary, and metamorphic lithologies. Major geological features were built during the main phases of Proterozoic and subsequent Phanerozoic orogenies, the break-up of the supercontinents Rodinia, Gondwana, and Pangea, and during the opening and closing of major ocean basins such as the Iapatus, Atlantic, Pacific, and Tethys. Three major tectono-stratigraphic domains are recognized (1) the Precambrian province that includes the African-Nubian Shield (ANS) to the east and the West African Craton (WAC) to the west, and the intervening Tuareg Shield and "Saharan Metacraton"; (2) the Variscan (Paleozoic) fold belt; and (3) the Atlas-Alpine (Mesozoic-Cenozoic) system. Mineral deposits of North Africa formed in a variety of geologic settings at different time periods from Archean to Quaternary. Mineral commodities including gold, silver, cobalt, nickel, chromium, arsenic, copper, lead, zinc, iron, and many other elements. Major deposit types present in the region are (1) orthomagmatic Cr-Ni-platinum group elements (PGE); (2) rare-metal granites and related rare-element pegmatites; (3) volcanic-hosted massive sulphide (VHMS); (4) sedimentaryexhalative (SEDEX); (5) orogenic and intrusion-related gold; (6) iron oxide-copper-gold (IOCG); (7) banded iron formation (BIF); (8) Mississippi Valley-type (MVT) lead-zinc; (9) sediment-hosted stratiform copper;Electronic supplementary material The online version of this chapter

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Un grand decrochement Est-Ouest au Nord du Maroc, a l'origine des structures plissees atlasiques; Arguments geologiques et experimentaux

Cited by 14 publications

References 0 publications

Eocene simple shear and plio‐quaternary pure‐shear folding in the Central‐Eastern Algerian Atlas

Eocene simple shear and plio‐quaternary pure‐shear folding in the Central‐Eastern Algerian Atlas

The Midelt earthquake of November 17th 2019, and its implications on the present-day tectonics of the junction of the High and Middle Atlas (Morocco)

Geologic and Metallogenic Framework of North Africa

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