Short-term episodes of carbonate productivity in a Cambrian uplifted rift shoulder of the Coastal Meseta, Morocco

Álvaro, J. Javier; Ezzouhairi, Hassan; Ayad, N. Ait; Charif, A.; Popov, Leonid E.; Ribeiro, Maria Luísa

doi:10.1016/j.gr.2008.04.003

Cited by 30 publications

(15 citation statements)

References 65 publications

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“…; faunas B2, A6) and a moderately diverse ‘ Eothele ’ fauna of the North African segment of Gondwana (B5; Mergl ; Streng ; Álvaro et al . ). Its similarity to the Siberian faunas appears to be superficial, as it contains a significant endemic acrotretide component, while the lingulides remain very poorly known.…”

Section: Faunal Affinities and Provincialitymentioning

confidence: 97%

“…It occurs, in particular, in the Sekten Formation ( Oryctocara and Kounamkites zones) of Siberia (Korovnikov, ), the Sidi‐Saïd‐Maâchou volcano‐sedimentary complex of the Moroccan Coastal Meseta (Álvaro et al . ) and the Pioche Shale (uppermost Bonnia–Olenellus Zone) of Nevada in Laurentia (Rowell ). The Australasian segment of Gondwana was probably the centre of origin and dispersal of Eothele , as well as it is the only region where Schizopholis is present.…”

Section: Faunal Affinities and Provincialitymentioning

confidence: 99%

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Himalayan Cambrian brachiopods

Popov

Holmer

Hughes

et al. 2015

Papers in Palaeontology

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Section: Faunal Affinities and Provincialitymentioning

confidence: 97%

Section: Faunal Affinities and Provincialitymentioning

confidence: 99%

Himalayan Cambrian brachiopods

Popov

Holmer

Hughes

et al. 2015

Papers in Palaeontology

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“…Transverse and longitudinal transects of a latest Ediacaran Moroccan rift sketch showing the Taguedit‐related palaeorelief preceding the onset of the Tamjout (Tifnout Member) sealing; High Atlas and Coastal Meseta reconstruction taken from Álvaro et al . () and Álvaro & Subías ().…”

Section: Palaeostructural Frameworkmentioning

confidence: 97%

“…The Atlas Mountains of Morocco are structurally divided by two major faults: the Anti‐Atlas major fault (AAMF in Fig. a), where some Pan‐African ophiolitic complexes are preserved, and the South Atlas fault (SAF), which marks the boundary between the Ediacaran‐early Palaeozoic platform and its basinal counterpart (Destombes et al ., ; Álvaro et al ., ). Soon after the Pan‐African collision and suturing (680‐660 Ma), extensive post‐orogenic uplift and subsequent collapse led to the formation of faulted troughs into which the thick volcanosedimentary succession of the Ouarzazate Group was deposited (Thomas et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Late Ediacaran syn‐rift/post‐rift transition and related fault‐driven hydrothermal systems in the Anti‐Atlas Mountains, Morocco

Álvaro

2012

Basin Research

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The syn-rift/post-rift transition of the late Ediacaran-mid Cambrian Atlas rift is characterized by the interplay of several processes, such as a widespread episode of fracturing and tilting, associated with encasement of fault-controlled vein metallic ore deposits of economic importance, and carbonate production and phosphogenesis (Taguedit Bed, Tabia Member) bordering rift-flank uplifts. A correlatable unconformity marks the end of these processes and the beginning of a thermal subsidence-dominated regime with development of a more stable, carbonate, peritidal-dominated platform (Tifnout Member). Late Ediacaran microbial carbonate production and phosphogenesis extended in discontinuous belts around the periphery of uplifted rift shoulders and flanks. Karst development is interpreted to have formed along synsedimentary faults and fractures during abrupt tectonic uplift associated with emplacement of polymetallic hydrothermal dikes (rich in Cu, Fe and subsidiary Pb, Zn). Isotopic analysis indicates that speleothem precipitation in karstic palaeocaves displays significantly lighter d 13 C and d 18 O values as compared to the host dolomite, implying calcite precipitation by terrestrial fluids rich in decomposing organic matter and/or microbial activity in the cave system.

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“…The High Atlas of Morocco was constructed during the Late Cretaceous‐Cenozoic but followed Triassic‐Jurassic rifting, which may have followed structural fabrics established during the Paleozoic Variscan/Hercynian orogeny. The region was also affected by Infracambrian‐Cambrian rifting and the Neoproterozoic Pan‐African orogeny (Alvaro et al, ; Beauchamp et al, ; Burkhard et al, ; Choubert & Faure‐Muret, ; Ennih & Liegeois, ; Frizon de Lamotte et al, ; Gasquet et al, ; Klitgord & Schouten, ; Mattauer et al, ; Piqué & Michard, ; Thomas et al, ).…”

Section: Geologic Backgroundmentioning

confidence: 99%

Reconstructing Extensional Basin Architecture and Provenance in the Marrakech High Atlas of Morocco: Implications for Rift Basins and Inversion Tectonics

et al. 2019

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The Moroccan Atlas developed through a multiphase tectonic history including Permian‐Jurassic continental rifting and Cretaceous‐Cenozoic intracontinental shortening. New detrital zircon (DZ) U–Pb geochronologic results from the Ourika‐Zat region in the Marrakech High Atlas constrain the sediment provenance of prerift sediment sources and synrift and postrift basin fill. Prerift Precambrian‐Cambrian units contain Neoproterozoic DZ from the Pan‐African orogeny. Ordovician rocks contain diagnostic 0.95‐ to 1.28‐Ga DZ that are absent in the West African Craton, suggesting distal sediment sources. Permian rift basin fill contains Permian zircons that constrain maximum deposition age and diagnostic of northern Meseta domain sediment sources. New mapping and cross‐section construction demonstrate that Permian basin fill accumulated in a half‐graben above a southward dipping normal fault that likely guided subsequent inversion. Triassic rift basin fill thickens southward, above a likely northward dipping normal fault. The change in rift basin geometry was accompanied by catchment reorganization, the introduction of southern rift flank sediment sources, and subbasin integration. The southern catchment expanded to encompass Meso‐Archean rocks of the Reguibat Shield situated >800 km southward. Existing and new provenance results from postrift strata document onset of recycling of Atlas rift basin fill during the mid‐Cretaceous and before the onset of compressional inversion. These results highlight the interaction between deformation and sediment routing in an extensional basin and sediment dispersal patterns across continental margins during multiphase deformation. Stratigraphic, structural, and provenance characteristics reveal that the Atlas rift shares similarities with high‐angle and supradetachment basin models, emphasizing the diverse nature of extensional styles.

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Short-term episodes of carbonate productivity in a Cambrian uplifted rift shoulder of the Coastal Meseta, Morocco

Cited by 30 publications

References 65 publications

Himalayan Cambrian brachiopods

Himalayan Cambrian brachiopods

Late Ediacaran syn‐rift/post‐rift transition and related fault‐driven hydrothermal systems in the Anti‐Atlas Mountains, Morocco

Reconstructing Extensional Basin Architecture and Provenance in the Marrakech High Atlas of Morocco: Implications for Rift Basins and Inversion Tectonics

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