Evidence of a Paleoproterozoic basement in the Moroccan Variscan Belt (Rehamna Massif, Western Meseta)

Pereira, M. Francisco; Houicha, Mohamed El; Chichorro, M.; Armstrong, Richard; Jouhari, Abdellatif; Attari, Ahmed El; Ennih, Nasser; Silva, J.B.

doi:10.1016/j.precamres.2015.07.010

Cited by 48 publications

(21 citation statements)

References 59 publications

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“…The enriched 13 C endmember could either be attributed to seawater-derived fluid or to a fluid that underwent interaction with ancient marine carbonates. The occurrence of carbonate-rich crustal rocks in Devonian and Visean metasediments (sandy limestone and limestones + calcschists respectively) of the TJAD, and their possible occurrence in some underlying Cambrian and Proterozoic rocks (Gasquet et al, 2008;Pereira et al, 2015; and references therein) is consistent with the latter hypothesis. The depleted 13 C end-member has δ 13 C values typical of fluids with some organic carbon, regardless of their origin.…”

Section: Stable Isotopes (O C)supporting

confidence: 58%

Isotopic and geochemical constraints on lead and fluid sources of the PbZnAg mineralization in the polymetallic Tighza-Jbel Aouam district (central Morocco), and relationships with the geodynamic context

Rossi

Gasquet

Cheilletz

et al. 2017

Journal of African Earth Sciences

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Section: Stable Isotopes (O C)supporting

confidence: 58%

Isotopic and geochemical constraints on lead and fluid sources of the PbZnAg mineralization in the polymetallic Tighza-Jbel Aouam district (central Morocco), and relationships with the geodynamic context

Rossi

Gasquet

Cheilletz

et al. 2017

Journal of African Earth Sciences

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“…Considering these aspects, we argue that Pan-African and Eburnean source rocks outcropping in the Meseta during the upper Triassic acted as source rocks for the studied samples from the CHA and the Argana basin. Supporting this hypothesis is the presence of Neo-to Paleoproterozoic basement in the Meseta (central-northern Morocco), which has been confirmed by recent geochronologic studies (e.g., Dostal et al, 2005;Tahiri et al, 2010;Pereira et al, 2015). The basement of the Meseta is presently formed by Hercynian intrusive…”

Section: C E P T E D M a N U S C R I P Tmentioning

confidence: 69%

“…0.3 Ga. Sparse pre-Hercynian acid and mafic intrusive rocks in the Meseta are of Pan-African and Eburnean age (Cocherie, 2001;Baudin et al, 2003;Tahiri et al, 2010;Pereira et al, 2014Pereira et al, , 2015.…”

Section: Accepted M M a N U mentioning

confidence: 99%

Proterozoic to Mesozoic evolution of North-West Africa and Peri-Gondwana microplates: Detrital zircon ages from Morocco and Canada

Marzoli

Davies

Youbi

et al. 2017

Lithos

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The complex history of assemblage and disruption of continental plates surrounding the Atlantic Ocean is in part recorded by the distribution of detrital zircon ages entrained in continental sedimentary strata from Morocco (Central High Atlas and Argana basins) and Canada (Grand Manan Island, New Brunswick). Here we investigate detrital zircon from the latest Triassic (ca. 202 Ma) sedimentary strata directly underlying lava flows of the Central Atlantic magmatic province or interlayered within them. SHRIMP (Sensitive High-Resolution Ion Microprobe) and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry) U-Pb ages for zircon range from Paleozoic to Archean with a dominant Neoproterozoic peak, and significant amounts of ca. 2 Ga zircon. These ages suggest a prevailing West African (Gondwanan) provenance at all sampling sites. Notably, the Paleoproterozoic zircon population is particularly abundant in central Morocco, north of the High Atlas chain, suggesting the presence of Eburnean-aged rocks in this part of the country, which is consistent with recent geochronologic data from outcropping rocks. Minor amounts of late Mesoproterozoic and early Neoproterozoic zircon (ca. 1.1-0.9 Ga) in Moroccan samples are more difficult to interpret. A provenance from Avalonia or Amazonia, as proposed by previous studies is not supported by the age distributions observed here. An involvement of more distal source regions, possibly located in northeastern Africa (Arabian Nubian Shield) would instead be possible. Paleozoic zircon ages are abundant in the Canadian sample, pointing to a significant contribution from Hercynian aged source rocks. Such a signal is nearly absent in the Moroccan samples, suggesting that zircon-bearing Hercynian granitic rocks of the Moroccan Meseta block were not yet outcropping at ca. 200

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“…Paleozoic rocks are exposed in the Eastern Moroccan Meseta in relatively small (from a few square kilometers up to approximately 1,200 km 2 ) and isolated inliers (Figure 1b), characterized by Cambrian–Permian successions deformed by Eovariscan (Late Devonian–Early Carboniferous) to Variscan (Carboniferous) events (Hoepffner, 1987). The Ediacaran basement that crops out in several areas of the Western Moroccan Meseta and Coastal Block (e.g., El Haibi et al, 2020; El Houicha et al, 2018; Ouabid et al, 2017; Pereira et al, 2014, 2015; Tahiri et al, 2010) has not been reported in the Eastern Moroccan Meseta. Thus, the oldest sedimentary rocks described in this latter region are shales and schists attributed to the Cambrian–Ordovician in the Midelt Massif by correlation with similar facies in the Western Moroccan Meseta (Hoepffner, 1989).…”

Section: Geological Settingmentioning

confidence: 99%

Tectonic Evolution of the Eastern Moroccan Meseta: From Late Devonian Forearc Sedimentation to Early Carboniferous Collision of an Avalonian Promontory

et al. 2020

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The deformed Paleozoic succession of the Eastern Moroccan Meseta crops out in relatively small and isolated inliers surrounded by Mesozoic and Cenozoic rocks. Two of the largest inliers (Mekkam and Debdou) are characterized by a monotonous succession of slates and greywackes affected by polyphasic folding that occurred at low‐ to very low grade metamorphic conditions. New U‐Pb ages on detrital zircon grains from the Debdou‐Mekkam metasediments constrain the maximal depositional age as Late Devonian, interpreted to be close to the true sedimentation age. Furthermore, the εHf values of the Devonian detrital zircons, together with the presence of a series of scattered zircon grains with ages between c. 0.9 and c. 1.9 Ga, suggest provenance from a subduction‐related magmatic arc located on the Avalonian margin. The Debdou‐Mekkam massif is characterized by an Early Carboniferous first deformational event (D1), which gave way to a pervasive cleavage (S1) associated with plurikilometric‐scale, tight to isoclinal, overturned to recumbent folds. Later events (Dc) occurred at Late Carboniferous time and generated variably developed crenulation cleavages (Sc) associated with variously oriented metric‐ to kilometric‐scale folds, which complicate the pattern of both D1 intersection lineations (L1) and axial traces. The restoration of this pronounced curved pattern yields originally SW‐NE‐oriented D1 fold axes with regional SE‐vergence. This important Early Carboniferous shortening and SE‐directed tectonic transport can be explained by closure of the Rheic Ocean and the first phases of the collision between the northern passive margin of Gondwana and an Avalonian promontory.

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Evidence of a Paleoproterozoic basement in the Moroccan Variscan Belt (Rehamna Massif, Western Meseta)

Cited by 48 publications

References 59 publications

Isotopic and geochemical constraints on lead and fluid sources of the PbZnAg mineralization in the polymetallic Tighza-Jbel Aouam district (central Morocco), and relationships with the geodynamic context

Isotopic and geochemical constraints on lead and fluid sources of the PbZnAg mineralization in the polymetallic Tighza-Jbel Aouam district (central Morocco), and relationships with the geodynamic context

Proterozoic to Mesozoic evolution of North-West Africa and Peri-Gondwana microplates: Detrital zircon ages from Morocco and Canada

Tectonic Evolution of the Eastern Moroccan Meseta: From Late Devonian Forearc Sedimentation to Early Carboniferous Collision of an Avalonian Promontory

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