Mise en évidence de la dynamique de la marge téthysienne de l'Hettangien à l'Aalénien dans la Dorsale calcaire (Tétouan, Rif, Maroc)

Lallam, Saïd; Sahnoun, Ezoulaarab; Hatimi, N. El; Hervouët, Yves; Leon, Julian Tejera de

doi:10.1016/s1251-8050(97)82506-2

Cited by 5 publications

(6 citation statements)

References 4 publications

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“…This rifting movement which is also known in the Rif area (Lallam et al, 1997;Mouhssine et al, 1999) could be correlative with the fifth secondorder Tethyan cycle (Lower Pliensbachian-Lower Toarcian) of De Graciansky et al (1993).…”

Section: Resultssupporting

confidence: 56%

The Selloum Basin: new element of the Middle Liassic paleogeography in the southern Middle Atlas (Morocco)

Arabi¹,

Canérot²,

Ouahhabi³

et al. 2004

Journal of African Earth Sciences

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Section: Resultssupporting

confidence: 56%

The Selloum Basin: new element of the Middle Liassic paleogeography in the southern Middle Atlas (Morocco)

Arabi¹,

Canérot²,

Ouahhabi³

et al. 2004

Journal of African Earth Sciences

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“…A major phase of extensional tectonics, marked by a strong subsidence, is also known in the Paris, Quercy and Dauphinois Basins, where it is dated of the latest Pliensbachian (de Graciansky et al , 1998) or earliest Toarcian (Floquet et al , 2003). Tectonic events similar and coeval to those of the Southern Provence Sub‐Basin are described in other Peri‐Tethyan Margins (Lallam et al , 1997; Thierry, 2000; El Arabi et al , 2001). This suggests that the extensional tectonism of the Southern Provence Sub‐basin is not only local but is related to the geodynamic processes affecting other western margins of the Ligurian Tethys.…”

Section: Discussion: Controlling Factors On Sedimentary Evolution Of mentioning

confidence: 76%

Interaction of tectonics, eustasy, climate and carbonate production on the sedimentary evolution of an early/middle Jurassic extensional basin (Southern Provence Sub‐basin, SE France)

2007

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This paper describes the evolution of an extensional basin in regard to the nature and sequence stratigraphic arrangement of its carbonate deposits.The purpose of this study is to evaluate the respective e¡ects of tectonism, eustasy, climate and oceanography on a carbonate sedimentary record. The case study is the early to mid-Jurassic age carbonate succession of the Southern Provence Subbasin (SE France), located within the southern part of the extensional Western European Tethyan Margin.This work is based on sedimentologic, biostratigraphic (using ammonites and brachiopods) and sequence stratigraphic analysis of the carbonate facies of the Cherty Reddish Limestone Formation (late Sinemurian to earliest Bajocian).These strata were deposited in shoreface to lower o¡shore depositional environments.The succession of the various environments together with the recognition of key stratigraphic surfaces allow us to de¢ne four second-order depositional sequences; of late Sinemurian to earliest Pliensbachian, early Pliensbachian to late Pliensbachian, earliest Toarcian to middle Aalenian and late Aalenian to early Bathonian ages.The architecture of the depositional sequences (thickness and facies variations within the systems tracts, wedge-shaped geometries) re£ects a strong tectonic control.The sub-basin was structured by extensional faults (oriented approximately 070^090/250^270). Sea-level variations, £uctuations in carbonate production and preservation, and environmental changes were also signi¢cant controlling factors of the carbonate deposition.The interplay of the tectonic control with the other factors resulted in ¢ve main phases in the sedimentary evolution of the sub-basin: (1) dominant tectonic control during the initial rifting stage (late Sinemurian to early Pliensbachian); (2) increasing extensional tectonics (mid-Pliensbachian); (3) global climato -eustatic sea-level fall (latest Pliensbachian) and global climatoeustatic sea-level rise plus hypoxia/anoxia (earlyToarcian); (4) relative sea-level fall linked to tectonic uplift related to the 'Mid-Cimmerian phase' (mid-Aalenian) and (5) oceanographic events (upwelling) and reduction in carbonate production (hypoxia/anoxia) plus tectonic downwarping (late Aalenian/ earliest Bajocian).

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“…Regional tectonic subsidence of the western Tethyan margins (Lallam et al. , 1997; de Graciansky et al.…”

Section: Discussionmentioning

confidence: 99%

“…Influence of local and/or regional subsidence on the sedimentary record of the Toarcian Oceanic Anoxic Event Regional tectonic subsidence of the western Tethyan margins (Lallam et al, 1997;de Graciansky et al, 1998;Thierry, 2000;El Arabi et al, 2001) probably has strongly influenced the sedimentary records of the global climatic perturbations that preceded the T-OAE. The tectonic initiation and development of restricted sub-basins resulted in the local development of stable anoxic conditions.…”

Section: Recovery Of Carbonate Production After the Toarcian Oceanic mentioning

confidence: 99%

“…This tectonic tilting is also evidenced by the marked differences of sediment thicknesses during the exaratum and falciferum Sub-zones between the Southern Provence sub-Basin and the Eastern Dauphinois sub-Basin that can be explained by different timing and intensity of tilting dynamics (Floquet et al, 2003;Léonide, 2007;Léonide et al, 2007). This tectonic tilting fits into the scheme of a major phase of extensional tectonics and marked subsidence that affected all peri-Tethyan margins at that time [for example: in the Paris, Quercy and Dauphinois basins (de Graciansky et al, 1998;Floquet et al, 2003); and in the Moroccan basins (Lallam et al, 1997;El Arabi et al, 2001)].…”

Section: Drowning Of a Carbonate Platform 179mentioning

confidence: 99%

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Drowning of a carbonate platform as a precursor stage of the Early Toarcian global anoxic event (Southern Provence sub‐Basin, South‐east France)

Léonide¹,

Floquet²,

Durlet³

et al. 2011

Sedimentology

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The Toarcian Oceanic Anoxic Event is well‐known as coinciding with a carbonate crisis, coupled with organic matter accumulation and perturbation of the carbon cycle expressed by carbon‐isotope excursions. In this palaeoenvironmental setting, the present research attempts to better constrain the palaeoenvironmental conditions leading to the drowning of a carbonate platform during Late Pliensbachian to Early Toarcian times. This study is based on the integrated sedimentological, diagenetic and geochemical (stable isotopes and Rock‐Eval pyrolysis) analysis of several stratigraphic successions located in the Southern Provence sub‐Basin (South‐east France). Eodiagenetic ferroan calcite cements below two hardground surfaces at the Pliensbachian–Toarcian transition record episodic eutrophication events. Such events were precursor stages of a global palaeoenvironmental perturbation (i.e. a global carbon cycle perturbation) that led to the demise of the carbonate platform and occurred prior to the Toarcian Oceanic Anoxic Event. Subsequently, the acme of the palaeoenvironmental deterioration that coincided with the Toarcian Oceanic Anoxic Event is recorded by a pronounced negative carbon‐isotope excursion (−3‰) followed by a positive one (2·87‰), organic matter preservation and inferred high temperature of surface sea water (ca 25°C) as given by oxygen‐isotope values from chondrichthyan tooth enamel. Sedimentological comparisons, as well as chemostratigraphic and biostratigraphical correlations between the Early Toarcian sedimentary series of the Southern Provence and Eastern Dauphinois sub‐basins, indicate that tectonic tilting occurred earlier in the Southern Provence sub‐Basin; this resulted in the preservation of organic‐rich deposits in the first sub‐basin and depositional hiatus in the second sub‐basin. Thus, local conditions, such as contrasting structural setting, could markedly modify the sedimentary signature of a global climatic event.

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Mise en évidence de la dynamique de la marge téthysienne de l'Hettangien à l'Aalénien dans la Dorsale calcaire (Tétouan, Rif, Maroc)

Cited by 5 publications

References 4 publications

The Selloum Basin: new element of the Middle Liassic paleogeography in the southern Middle Atlas (Morocco)

The Selloum Basin: new element of the Middle Liassic paleogeography in the southern Middle Atlas (Morocco)

Interaction of tectonics, eustasy, climate and carbonate production on the sedimentary evolution of an early/middle Jurassic extensional basin (Southern Provence Sub‐basin, SE France)

Drowning of a carbonate platform as a precursor stage of the Early Toarcian global anoxic event (Southern Provence sub‐Basin, South‐east France)

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