Fractures distribution and basement-cover interaction in a polytectonic domain: A case study from the Saghro Massif (Eastern Anti-Atlas, Morocco)

Hejja, Younes; Baïdder, Lahssen; Ibouh, Hassan; Bba, Abdellah Nait; Soulaı̈mani, Abderrahmane; Gaouzi, Abdelaziz; Maacha, Lhou

doi:10.1016/j.jafrearsci.2019.103694

Cited by 30 publications

(24 citation statements)

References 60 publications

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“…12A and B), well-described in the eastern Anti-Atlas [Baidder et al, 2008, Errami and Olivier, 2012, Pouclet et al, 2018, Raddi et al, 2007, Soulaimani et al, 2014. Similar tectonic patterns were recently observed in the Ediacaran-Cambrian contact zone located in northeastern [Hejja et al, 2020] and southwestern Saghro massif [Aabi et al, 2020].…”

Section: Tectonic Control On Mineralized Veinssupporting

confidence: 84%

“…760-740 Ma and 660-640 Ma occur in the Bou Azzer-Siroua Pan-African suture zone [Blein et al, 2014a, El Hadi et al, 2010, Inglis et al, 2005, Triantafyllou et al, 2016. To the northeast of the AAMF, the Pan-African units correspond to the Early Hindermeyer et al [1977], Tuduri et al [2018], Hejja et al [2020], Aabi et al [2020], and this work.…”

Section: Regional Geological Settingsupporting

confidence: 59%

“…Paleozoic deposits surrounding the massif are made up of terrigenous clastic deposits and minor carbonates, the age of which range from Cambrian to Carboniferous [Cerrina Feroni et al, 2009]. NW-SE Cambrian rifting resulted in numerous tilted blocks around the Saghro massif [Hejja et al, 2020]. During the important Late Devonian extensional event, normal faulting likely affected the massif similar to the nearby Ougnat massif [Baidder et al, 2008].…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…Triassic-Jurassic Foum Zguid dyke) (Figure 1C). These transtensional structures have cut across the Precambrian-Paleozoic deformed terrains during the Central Atlantic rifting [Hejja et al, 2020]. Throughout the Cenozoic, due to the Atlasic compression, the Meso-Cenozoic sedimentary cover of the Ouarzazate basin was affected by east to ENE-trending reverse faults and related folds, whereas the structures of the Saghro basement were variably inverted [Hejja et al, 2020, Pastor et al, 2012, Soulaimani et al, 2014.…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…Folds and faults are numerated after Michard et al [2010]. (C) Structural map of the Saghro massif, interpreted fromHindermeyer et al [1977],Tuduri et al [2018],Hejja et al [2020],Aabi et al [2020], and this work.…”

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confidence: 99%

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The Cu–Pb–Zn-bearing veins of the Bou Skour deposit (Eastern Anti-Atlas, Morocco): structural control and tectonic evolution

Aabi¹,

Baïdder²,

Hejja³

et al. 2021

Comptes Rendus. Géoscience

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In the central Saghro massif of the Moroccan Anti-Atlas belt, the Bou Skour polymetallic deposit is hosted within mafic to felsic rocks of the Ediacaran Saghro Group and the lower Ouarzazate Group together with Pan-African plutons and dykes. The mineralizations occur in a brittle-ductile shear zone as a vein-type system recently dated at 574.9 ± 2.4 Ma. In this contribution, a new multiscale structural mapping and vein system analysis have been integrated to understand structural control and tectonic evolution of the Bou Skour deposit. The most important mineralized structures are known as "Filon Principal", "Filon 1", and "Filon 2" and are mainly hosted within NNW to NW transcrustal faults. They are represented as en-echelon tension gashes occasionally associated with horsetail satellite structures pointing to left-lateral strike-slip movement. The age and tectonic patterns are coherent with the NW-SE shortening of the last stage of the Pan-African orogeny rather than with post Pan-African events. Subsequent collapses and tilted blocks were accommodated by NE-to ENE normal and strike-slip faults in response to the Late Ediacaran-Cambrian extension events. Much later, probably during the Variscan or even Atlasic shortening, conjugated strike-slip reverse faults and related folds occurred, disrupting most of the rhyolitic dykes as well as the major mineralized structures.

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Section: Tectonic Control On Mineralized Veinssupporting

confidence: 84%