Le passage Lias moyen–Lias supérieur dans la région de Todrha-Dadès : événements bio-sédimentaires et géodynamiques (Haut Atlas central, Maroc)

Ettaki, Mohammed; Chellaı̈, El Hassane; Milhi, Abdellah; Sadki, Driss; Boudchiche, Lahbib

doi:10.1016/s1251-8050(00)01458-0

Cited by 11 publications

(27 citation statements)

References 4 publications

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“…The Pliensbachian-Toarcian transition is marked by an abrupt deepening of the basin and a change from carbonate to clastic sedimentation (shale and turbiditic sandstone, Unit III). This transition is recorded elsewhere in the High Atlas rift, and represents a roughly synchronous event of platform drowning in the rift axis and emersion in the rift margins, attributed to regional vertical movements coinciding with the early Toarcian eustatic high (Ettaki et al, 2000). The deepening profile actually starts with the transition from the Idikel shallow water to the deeper water carbonates of the Lotharingian-Pliensbachian formations, as happens elsewhere in the High Atlas of Rich (Neuweiler et al, 2001;Wilmsen and Neuweiler, 1988).…”

Section: Discussionmentioning

confidence: 69%

Structural and facies architecture of a diapir-related carbonate minibasin (lower and middle Jurassic, High Atlas, Morocco)

Teixell

Barnolas

Rosales

et al. 2017

Marine and Petroleum Geology

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We report the structural geometry and facies architecture of a small diapir-related carbonatedominated basin from the Jurassic rift of the Moroccan High Atlas. The Azag minibasin is a lozenge-shaped depocenter completely enclosed by tectonic boundaries that we interpret as welds after former salt anticlines or salt walls. The exposed ca. 3000 m-thick infill of the Azag minibasin is asymmetric; layers are tilted to the W defining a rollover geometry. Areallyrestricted sedimentary discontinuities and wedges of growth strata near the basin margins indicate sedimentation contemporaneous with diapiric rise of a Triassic ductile layer. Facies evolution through the basin reflects local accommodation by salt withdrawal and regional events in the High Atlas rift. The early basin infill in the Sinemurian and Pliensbachian shows thickness variations indicative of low-amplitude halokinetic movements, with reduced exposed thicknesses compared to surrounding areas. The exposed Toarcian and Aalenian deposits are also reduced in thickness compared to areas outside the basin. Subsidence increased dramatically in the Bajocian-early Bathonian (?), the main phase of downbuilding, when over 2600 m of carbonates and shales accumulated at a rate > 0.5 mm/a in the depocentral area of the minibasin governed by W-directed salt expulsion. The stratigraphic units distinguished often show maximum thicknesses and deeper facies in the depocentral area, and rapidly change to shallower facies at the basin margins. The Bajocian carbonate facies assemblage of the minibasin include: reservoir facies as microbialite-coral reefs in the basin margins (formed during periods of strong diapir inflation and bathymetric relief), basin-expansive oolite bars (formed during episodes of subdued relief), and organic-rich, dark lime mudstones and shales that show source-rock characteristics. The Azag basin is a good analog for the exploration of salt-related carbonate plays in rifts and continental margins where source-rock and reservoir can form in a same minibasin.

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Section: Discussionmentioning

confidence: 69%

Structural and facies architecture of a diapir-related carbonate minibasin (lower and middle Jurassic, High Atlas, Morocco)

Teixell

Barnolas

Rosales

et al. 2017

Marine and Petroleum Geology

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“…The rapid transition from shallow marine carbonates to hemipelagic facies combined with periods of non-deposition indicates a rapid relative sea-level rise and the most substantial drowning event (MDS). This radical change in sedimentation reflects a major deepening phase across the entire High Atlas and Middle Atlas area (Ettaki et al 2000;El Arabi et al 2001;Wilmsen & Neuweiler 2008). This drowning episode is coupled with the eustatic sea-level rise of the early Toarcian in Europe and Africa described by many workers (Vail et al 1984;de Graciansky et al 1998;Hardenbol et al 1998;Gomez et al 2008).…”

Section: Late Domerian To Early Toarcian Eustatic Sea-level Rise (Hawmentioning

confidence: 89%

Early Jurassic normal faulting in a carbonate extensional basin: characterization of tectonically driven platform drowning (High Atlas rift, Morocco)

Lachkar

Guiraud

Harfi

et al. 2009

JGS

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This paper describes a tectonostratigraphic model of the synrift evolution of the Early Jurassic High Atlas rift of Morocco. The model is constrained by mapping of a set of inverted extensional blocks, by facies analysis of carbonate platform and turbiditic to hemipelagic synrift deposits, and by high-resolution (n 3 100 ka) biostratigraphy of the Early Jurassic succession. The chronostratigraphic packages of the High Atlas of Rich vary significantly in thickness, facies and architecture from one tectonic block to another. Our study shows how synrift strain varied in space and time over a long time interval (14 Ma) around the High Atlas rift. Initially, in Sinemurian time, the High Atlas rift was affected by low-strain normal faulting that controlled the growth of an extensive, low-gradient carbonate platform, except in the northern domain (towards the rift axis), where hemipelagic deposition related to high-rate faulting prevailed. Subsequently, in Carixian-Domerian time, a rapid increase in accommodation space and block subsidence caused by highstrain normal faulting brought about localized drowning of the carbonate platform and the development of calciturbidites and of starved deposits towards the rift axis. During this interval, high-strain, upper-crustal normal faulting migrated rapidly (over a period of 5 Ma) towards the rift periphery.

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“…Specimens come from the upper part of the Choucht Formation, which is a proximal equivalent of the Ouchbis Formation. This interval is dated by ammonite biostratigraphy and corresponds to the late Pliensbachian Emaciatum ammonite chronozone, more specifically the Elisa sub-chronozone (Ettaki et al 2000). The age is confirmed by the presence of the nannofossil Lotharingius sigillatus (a marker for the nannofossil subzone NJT5b) found below the Choucht Formation in the Tizguin section (Mattioli et al 2013;Bodin et al 2016).…”

Section: Geological Settingsmentioning

confidence: 96%

Pliensbachian corals from the Western Tethys

Vasseur

Lathuilière

2021

Geodiversitas

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Geodiversitas est indexé dans / Geodiversitas is indexed in:-Science Citation Index Expanded (SciSearch ® ) -ISI Alerting Services ® -Current Contents ® / Physical, Chemical, and Earth Sciences® -Scopus ® Geodiversitas est distribué en version électronique par / Geodiversitas is distributed electronically by: -BioOne ® (http://www.bioone.org) Les articles ainsi que les nouveautés nomenclaturales publiés dans Geodiversitas sont référencés par / Articles and nomenclatural novelties published in Geodiversitas are referenced by: -ZooBank ® (http://zoobank.org) GEODIVERSITAS • 2021 • 43 (22) © Publications scientifiques du Muséum national d'Histoire naturelle, Paris.

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Le passage Lias moyen–Lias supérieur dans la région de Todrha-Dadès : événements bio-sédimentaires et géodynamiques (Haut Atlas central, Maroc)

Cited by 11 publications

References 4 publications

Structural and facies architecture of a diapir-related carbonate minibasin (lower and middle Jurassic, High Atlas, Morocco)

Structural and facies architecture of a diapir-related carbonate minibasin (lower and middle Jurassic, High Atlas, Morocco)

Early Jurassic normal faulting in a carbonate extensional basin: characterization of tectonically driven platform drowning (High Atlas rift, Morocco)

Pliensbachian corals from the Western Tethys

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