Contribution to a geodynamic reconstruction of the Anti-Atlas (Morocco) during Pan-African times with the emphasis on inversion tectonics and metallogenic activity at the Precambrian–Cambrian transition

Gasquet, Dominique; Levresse, Gilles; Cheilletz, Alain; Azizi-Samir, Moulay Rachid; Mouttaqi, Abdellah

doi:10.1016/j.precamres.2005.06.009

Cited by 286 publications

(228 citation statements)

References 75 publications

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“…This oceanic domain was closed during a first Pan-African tectonic event (D1) at ca. 660 Ma [11,[27][28][29]. Then a late orogenic, volcanic, volcaniclastic, and conglomeratic formation, the Lower Ediacaran Tiddiline Formation (Figure 2), was deposited during the waning stages of the Pan-African collision and deformed by a second event (D2) around 600 Ma [11,30].…”

Section: Introductionmentioning

confidence: 99%

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

et al. 2017

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The Tizert Cu-Ag deposit is the largest of a series of sediment-hosted copper deposits of the Anti-Atlas copper province in Morocco. Mineralized rocks in the deposit contain disseminated sulphides within a Late Ediacaran, dominantly siliciclastic sedimentary formation named the Basal Series. Isopach map of the Basal Series thickness shows that during the Late Ediacaran the area was composed of large subsiding zones separated by paleohighs. The ore-grade zones are well developed along basin margins adjacent to the basement paleohighs. These mineralized zones display a lateral sulphide zoning with central bornite-chalcocite zones grading outward to intermediate chalcopyrite and external pyrite zones. There is also a vertical sulphide zoning with evolution from bornite and chalcocite dominant mineralized rocks at the bottom to chalcopyrite and pyrite dominant mineralized rocks at the top of the lithostratigraphic succession. A second style of mineralization is represented by sulphide filled fractures and veins present in the Basal Series, as well as in the basement and the overlying dolomites. The similarity of the paragenetic sequences between the disseminated and the vein-hosted mineralization suggests that they may be related to the same mineralizing event, the disseminated style of mineralization being rapidly followed by the onset of the vein-style mineralization.

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Section: Introductionmentioning

confidence: 99%

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

et al. 2017

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“…615-548 Ma; Gasquet et al 2005;Pouclet et al 2007;Walsh et al 2012;Álvaro et al 2014a), the Malcocinado Group of the OssaMorena Zone in SW Iberia (587-540 Ma; Sánchez-García et al 2003, some reworked clasts lining the Narcea/ Herrería contact in the Cantabrian Zone (ca. 575-560 Ma; Rubio-Ordóñez et al 2015), and the Sériès Tuffs of the Axial Zone and the Rivernous Formation of the northern Montagne Noire in the Occitan Domain (ca.…”

Section: Cadomian Arc-related Events In West Gondwanamentioning

confidence: 99%

Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe

Padel

Álvaro

Casas

et al. 2017

Int J Earth Sci (Geol Rundsch)

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International audienceThe volcanism hosted by the Ediacaran–Terreneuvian Canaveilles Group of the Eastern Pyrenees displays two distinct geochemical affinities: (1) metabasites of the Nyer and Olette formations reflect the emplacement of a tholeiitic magmatism linked to extensional conditions, whereas (2) subsequent felsic and calc-alkaline magmatic rocks marking the top of the Olette Formation and forming the overlying Fabert and Finestrelles members represent Cadomian magmatic events. Based on U–Pb zircon dating constraints, palaeotopographic relationships linked to onlap geometries and distance from vent sources, three volcanosedimentary edifices can be distinguished, the so-called Tregurà (ca. 565–552 Ma), Cap de Creus (ca. 558 Ma) and Coll d’Ares (ca. 542–532 Ma) edifices. The top of their palaeoreliefs recorded locally the nucleation of centres of microbial carbonate productivity (Puig Sec Member) linked to synsedimentary tilting and karstification. Throughout West Gondwana, the presence of carbonate production across the Ediacaran–Cambrian transition is exclusively located in back-arc settings (Central-Iberian Zone) and areas far from the Cadomian subduction trench and devoid of significant terrigenous input, such as those reported in the Eastern Pyrenees and the neighbouring Montagne Noire

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“…The margin was dominated by an extensional regime associated with prolific rift-related tholeiitic-alkaline volcanism in neighbouring areas, such as Morocco and Ossa-Morena (Gasquet et al 2005, Pereira et al 2006. The extensional regime resulted in the formation of graben and halfgraben systems, which controlled the distribution of carbonate platforms and slope and deeper basin facies (Fig.…”

Section: Palaeoclimatic Conditions and Anoxiamentioning

confidence: 99%

Stratigraphic record and palaeogeographic context of the Cambrian Epoch 2 subtropical carbonate platforms and their basinal counterparts inSW Europe, West Gondwana

Álvaro¹,

Monceret²,

Monceret³

et al. 2010

Bull. Geosci.

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The Ibero-Armorican Arc is the main Variscan macrostructure inSWEurope. Its branches preserve the Cambrian record of a continuous margin of West Gondwana, from its southwestern edge (West Asturian-Leonese and Cantabrian zones and their lateral continuity into the Iberian Chains) to its northeastern extension (basement of the Cenozoic Aquitaine basin, Montagne Noire, southern Cévennes, and Sardinia). These Variscan relics allow the reconstruction of a Cambrian Epoch 2 carbonate belt that developed intermittently along West Gondwana. Facies associations show that the main centres of carbonate productivity were nucleated in ooidal and sand shoals, together with microbial and microbial- archaeocyathan reefs, developed in high energy regimes under subtropical arid conditions. Outside the inner carbonate belt, carbonate production was episodic and related to deposition of kerogenous black shales and phosphogenesis in the Central Iberian Zone and northern parts of Montagne Noire and Cévennes. Development of carbonate platforms along the margin was diachronous and discontinuous, due to poleward drifting and tectonically induced drowning and flooding. Biogeographic connection with similar subtropical carbonate platforms from East Gondwana (mainly South China) favoured the migration of equatorial and subtropical trilobite genera, such as Dolerolenus, Eoredlichia, Metaredlichia, Protolenus, Redlichia, and Sardaspis

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Contribution to a geodynamic reconstruction of the Anti-Atlas (Morocco) during Pan-African times with the emphasis on inversion tectonics and metallogenic activity at the Precambrian–Cambrian transition

Cited by 286 publications

References 75 publications

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

Cadomian volcanosedimentary complexes across the Ediacaran–Cambrian transition of the Eastern Pyrenees, southwestern Europe

Stratigraphic record and palaeogeographic context of the Cambrian Epoch 2 subtropical carbonate platforms and their basinal counterparts inSW Europe, West Gondwana

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