Géochronologie U-Pb sur zircon de granitoïdes éburnéens et panafricains dans les boutonnières protérozoïques d'Igherm, du Kerdous et du Bas Drâa (Anti-Atlas occidental, Maroc)

Malek, Halima Ait; Gasquet, Dominique; Bertrand, J.; Leterrier, J.

doi:10.1016/s1251-8050(99)80056-1

Cited by 33 publications

(45 citation statements)

References 5 publications

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“…8c), as in the Lower and Upper Units and Beiras Group. Paleoproterozoic ages are related to the Eburnian orogeny, igneous rocks of which are located in two areas of north Africa: in the West African Craton (western and central Anti-Atlas, Morocco: Malek et al 1998;Walsh et al 2002;Thomas et al 2002;Barbey et al 2004;Gasquet et al 2004) and in the Saharan Metacraton (Western Egypt: Bea pers. com.).…”

Section: Comparison With Other Samples Of the Sgc And Zircon Provenancementioning

confidence: 99%

SHRIMP U–Pb geochronological constraints on the timing of the intra-Alcudian (Cadomian) angular unconformity in the Central Iberian Zone (Iberian Massif, Spain)

Talavera

Poyatos

Lodeiro

2015

Int J Earth Sci (Geol Rundsch)

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source areas verifies recent studies that point to the Cadomian foreland in the north Gondwana continent affected by the Pan-African orogeny: the West African Craton and/or the Saharan Metacraton. Furthermore, ongoing Cadomian arc-related magmatism in Iberia (c. 605-545 Ma) could have contributed as a local zircon source. The end of the Cadomian activity is marked by a transient stage (ephemeral Lower Cambrian platform) which preceded widespread Cambro-Ordovician rifting of north Gondwana.

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Section: Comparison With Other Samples Of the Sgc And Zircon Provenancementioning

confidence: 99%

SHRIMP U–Pb geochronological constraints on the timing of the intra-Alcudian (Cadomian) angular unconformity in the Central Iberian Zone (Iberian Massif, Spain)

Talavera

Poyatos

Lodeiro

2015

Int J Earth Sci (Geol Rundsch)

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“…The medium-grade metamorphic and plutonic rocks upon which the Neoproterozoic rocks in the Anti-Atlas were deposited are now well established as Palaeoproterozoic in age within a range of 2200 to 2030 Ma (Aït Malek et al, 1998;Thomas et al, 2002). They thus represent products of the Eburnian-Birimian orogenic event recognised in many parts of the West African Craton.…”

Section: Palaeoproterozoic Basement (2200 To 2030 Ma)mentioning

confidence: 97%

A new lithostratigraphic framework for the Anti-Atlas Orogen, Morocco

Thomas

Fekkak

Ennih

et al. 2004

Journal of African Earth Sciences

213

148

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-A new lithostratigraphic nomenclatural framework is proposed for the Anti-AtlasOrogen of Morocco, to replace the previous chronostratigraphic scheme. All Continued prolonged convergence gave rise to a sinistral transpressional regime in which late syn-to post-tectonic continental volcanic and clastic sequences of the Ouarzazate Supergroup were deposited. The first rocks of this new tectonic regime were deposited in narrow, tectonically active, strike-slip pull-apart rift basins (Bou Salda, Mgouna, Tafrawt and Anzi Groups), associated with intrusion of high-K calc-alkaline granitoid batholiths (e.g. Assarag, Bardouz Suites) and the juxtaposition of ophiolitic remnants in major strike-slip shear belts. These were followed by the deposition of the much more areally extensive continental volcano-sedimentary molasse, the volcanic components of which were erupted from several interfingering volcanic centres, often associated with caldera complexes and sub-volcanic alkaline granites 2 (Toufhgrane, Tanghourt and Guellaba Suites). The proposed lithostratigraphic scheme encompasses all the major rock units identified in the literature from the orogen and is flexible so that new, lower-ranking, units can be placed at the appropriate stratigraphic level in future. This framework is supported by new high-precision U-Pb zircon dates that have recently become available.

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“…Note that we use the term basement here in the sense of the petroleum geologists [58], including all rocks older than the Gondwana Megacycle. The oldest rocks of the West-African Craton (WAC) are granitoids, gneisses and a complex series of metamorphic rocks, attributed to the Eburnean orogeny at around 2000 Ma [2,96,98]. The final assembly of most of the African continental crust takes place during the Panafrican orogeny, lasting roughly from 700 to 600 Ma [46].…”

Section: The Basementmentioning

confidence: 99%

Tectonics of the Anti-Atlas of Morocco

Burkhard

Caritg

Helg

et al. 2006

Comptes Rendus. Géoscience

143

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The Anti-Atlas is reviewed and examined in the light of its geodynamic significance as a Palaeozoic basin and fold belt. Shortening is accommodated by polyharmonic buckle folding of the cover in a thick-skinned fashion without the development of any significant thrust/duplex systems. The Anti-Atlas is heavily inverted deep intracratonic basin, rather than a former passive margin of the Palaeo-Tethys Ocean. Inversion took place in Late Carboniferous to Early Permian times. Main shortening directions changed from NW-SE to north-south and maybe NE-SW through time, leading to the development of dome and basin patterns on scales from 100 m to 10 km.

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Géochronologie U-Pb sur zircon de granitoïdes éburnéens et panafricains dans les boutonnières protérozoïques d'Igherm, du Kerdous et du Bas Drâa (Anti-Atlas occidental, Maroc)

Cited by 33 publications

References 5 publications

SHRIMP U–Pb geochronological constraints on the timing of the intra-Alcudian (Cadomian) angular unconformity in the Central Iberian Zone (Iberian Massif, Spain)

SHRIMP U–Pb geochronological constraints on the timing of the intra-Alcudian (Cadomian) angular unconformity in the Central Iberian Zone (Iberian Massif, Spain)

A new lithostratigraphic framework for the Anti-Atlas Orogen, Morocco

Tectonics of the Anti-Atlas of Morocco

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