Origine et contexte geotectonique des depots detritiques du groupe neoproterozoïque inferieur de Kelaat Mgouna (Anti-Atlas Oriental, Maroc)

Fekkak, Abdelilah; Boualoul, Mustapha; Badra, Lakhlifi; Amenzou, M.; Saquaque, Ali; El-Amrani, I.E.

doi:10.1016/s0899-5362(00)00021-x

Cited by 30 publications

(19 citation statements)

References 14 publications

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“…These oldest formations belong to the Anti-Atlas supergroup, Saghro Group or MGouna Group of Thomas et al [5] or Habab Group of O'Connor et al [107] and consist of metaturbidites with intercalated thin mafic metavolcanic layers, exposed, from west to east, near the cities of Sidi Flah, Qal'at Mgouna, Boumalne and Imiter ( Figure 2). The metasedimentary sequences, hereafter, called metagreywackes, are dominated by sandstones and silty mudstone [91,92,[114][115][116][117][118]. Although slightly deformed (Figures 3 and 4), they consist of 2000 to 6000 m of flysh-like turbiditic rocks [83,91,118] that locally alternate with basaltic flows, volcanic breccias, hyaloclastite and pillow structures (Figure 3a,b).…”

Section: The Earlier Arc-related Metagreywackes and Metavolcanic Rocksmentioning

confidence: 99%

The Jbel Saghro Au(–Ag, Cu) and Ag–Hg Metallogenetic Province: Product of a Long-Lived Ediacaran Tectono-Magmatic Evolution in the Moroccan Anti-Atlas

et al. 2018

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The Jbel Saghro is interpreted as part of a long-lived silicic large igneous province. The area comprises two lithostructural complexes. The Lower Complex consists of folded metagreywackes and N070–090°E dextral shear zones, which roughly results from a NW–SE to NNW–SSE shortening direction related to a D1 transpressive tectonic stage. D1 is also combined with syntectonic plutons emplaced between ca. 615 and 575 Ma. The Upper Complex is defined by ash-flow caldera emplacements, thick and widespread ignimbrites, lavas and volcaniclastic sedimentary rocks with related intrusives that were emplaced in three main magmatic flare ups at ca. 575, 565 and 555 Ma. It lies unconformably on the Lower Complex units and was affected by a D2 trantensive tectonic stage. Between 550 and 540 Ma, the magmatic activity became slightly alkaline and of lower extent. Ore deposits show specific features, but remain controlled by the same structural setting: a NNW–SSE shortening direction related to both D1 and D2 stages. Porphyry Au(–Cu–Mo) and intrusion-related gold deposits were emplaced in an earlier stage between 580 and 565 Ma. Intermediate sulfidation epithermal deposits may have been emplaced during lull periods after the second and (or) the third flare-ups (560–550 Ma). Low sulfidation epithermal deposits were emplaced late during the felsic alkaline magmatic stage (550–520 Ma). The D2 stage, therefore, provided extensional structures that enabled fluid circulations and magmatic-hydrothermal ore forming processes.

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Section: The Earlier Arc-related Metagreywackes and Metavolcanic Rocksmentioning

confidence: 99%

The Jbel Saghro Au(–Ag, Cu) and Ag–Hg Metallogenetic Province: Product of a Long-Lived Ediacaran Tectono-Magmatic Evolution in the Moroccan Anti-Atlas

et al. 2018

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“…1). The Saghro Group has been interpreted as a distal-slope equivalent of the Taghdout Group, deposited between the WAC to the south and an island arc (Thomas et al 2002, Bouougri 2003 or slivers of rifted Eburnean crust (Fekkak et al 2000, Fekkak et al 2002,Ouguir et al 1996, Fekkak et al 2001, such as Cadomia (Samson and D'Lemos 1998), to the north. Igneous zircons from the Iriri migmatite (Siroua) provide a crystallization age for northern arc rocks later accreted during the Pan-African collision and have an age of 743::1::13Ma (Thomas et al 2002).…”

Section: Tectonostratigraphic Settingmentioning

confidence: 99%

An expanded record of Early Cambrian carbon cycling from the Anti-Atlas Margin, Morocco

et al. 2005

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We present a δ13C record from the Anti-Atlas mountains of Morocco and place it in the context of a detailed regional tectonostratigraphy. We place the litho- and chemostratigraphic record in a temporal framework using precision UPb zircon geochronology of ashes interbedded with the same carbonate units that provide δ13C data. The variations in δ13C of carbonate occur on a wide range of time scales, suggesting that different mechanisms are involved, including non-steady state release of isotopically depleted carbon reservoirs on short (<100 000 years) time scales and changes in nutrient recycling and organic carbon burial on longer (≥1 Ma) time scales. Through a correlation with more fossiliferous, albeit condensed, sections in Siberia, we examine the pattern of cyclic δ13C variation in the context of the reappearance and diversification of skeletonized metazoa during the Early Cambrian.

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“…The latter domain extends northward and encompasses the arc and back-arc Saghro sequences, which partly overlap on early rift-basin volcanosedimentary sequences Ouguir et al, 1996;Fekkak et al, 2000).…”

Section: Geological Backgroundmentioning

confidence: 99%

Lithostratigraphic framework and correlation of the Neoproterozoic northern West African Craton passive margin sequence (Siroua–Zenaga–Bouazzer Elgraara Inliers, Central Anti-Atlas, Morocco): an integrated approach

Bouougri

Saquaque²

2004

Journal of African Earth Sciences

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Origine et contexte geotectonique des depots detritiques du groupe neoproterozoïque inferieur de Kelaat Mgouna (Anti-Atlas Oriental, Maroc)

Cited by 30 publications

References 14 publications

The Jbel Saghro Au(–Ag, Cu) and Ag–Hg Metallogenetic Province: Product of a Long-Lived Ediacaran Tectono-Magmatic Evolution in the Moroccan Anti-Atlas

The Jbel Saghro Au(–Ag, Cu) and Ag–Hg Metallogenetic Province: Product of a Long-Lived Ediacaran Tectono-Magmatic Evolution in the Moroccan Anti-Atlas

An expanded record of Early Cambrian carbon cycling from the Anti-Atlas Margin, Morocco

Lithostratigraphic framework and correlation of the Neoproterozoic northern West African Craton passive margin sequence (Siroua–Zenaga–Bouazzer Elgraara Inliers, Central Anti-Atlas, Morocco): an integrated approach

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