Première caractérisation palynologique du Trias moyen dans le Haut Atlas ; implications pour l'initiation du rifting téthysien au Maroc

Arabi, El Hassane El; Diez, José B.; Broutin, Jean; Essamoud, Rachid

doi:10.1016/j.crte.2006.04.001

Cited by 46 publications

(23 citation statements)

References 10 publications

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“…Pangean intracontinental rifting, that triggered the opening of the Central Atlantic Ocean, commenced in the Late Permian-Early Triassic (Ruellan 1985;Ruellan et al 1985;Medina 1995Medina , 2000El Arabi et al 2006) and progressed northwards, following the direction of the late Palaeozoic AlleghenianHercynian orogenic chain. The oldest identified magnetic anomaly on conjugate margins from the Central Atlantic have a Mid-Jurassic age (Klitgord & Schouten 1986), but recent reconstructions of the opening of the Central Atlantic Ocean (Sahabi et al 2004) place the age of the earliest oceanic crust at the end of the .…”

Section: Geodynamic Contextmentioning

confidence: 97%

Morphology, internal architecture and emplacement mechanisms of lava flows from the Central Atlantic Magmatic Province (CAMP) of Argana Basin (Morocco)

Hachimi

Youbi

Madeira

et al. 2011

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The morphology, internal architecture and emplacement mechanisms of the Central Atlantic Magmatic Province (CAMP) lava flows of Argana Basin in Morocco are presented. The volcanic pile was produced by two volcanic pulses. The first, represented by the Tasguint Formation, corresponds to a succession of 3 -13 individual flows created by 1-8 eruptions; the second, Alemzi Formation, is composed of 2 -7 individual flows formed by 1-4 eruptions. These formations, geochemically distinct, are separated by thin silty or sandy horizons or by palaeosols. They include 'compound pahoehoe flows' and 'simple flows'. The first type is almost exclusive of the lower formation, while the second type dominates the upper formation. The lava flows show clear evidence of endogenous growth or 'inflation'. The characteristics of the volcanic pile suggest slow emplacement during sustained eruptive episodes and are compatible with a continental basaltic succession facies model. Earth's history has been punctuated over at least the last 3.5 billion years by episodic massive volcanic events on a scale unknown in the recent geological past. Largely unknown mechanical and dynamic processes, with unclear relationships to seafloor spreading and subduction, generated voluminous, predominantly mafic magmas that were emplaced into the Earth's crust. The resultant large igneous provinces (LIPs; Coffin & Eldholm 1994;Ernst & Buchan 2001;Sheth 2007;Bryan & Ernst 2008) were at times accompanied by catastrophic environmental changes (Rampino et al.

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Section: Geodynamic Contextmentioning

confidence: 97%

Morphology, internal architecture and emplacement mechanisms of lava flows from the Central Atlantic Magmatic Province (CAMP) of Argana Basin (Morocco)

Hachimi

Youbi

Madeira

et al. 2011

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“…The age of the onset of extension in the western parts of the Atlas rift (High Atlas of Marrakech) is well dated as Anisian (∼240 Ma) by El Arabi et al [2006] and becomes unclear toward the central parts, where the first syn‐rift sediments are assumed to be Carnian (∼228 Ma) [ Beauchamp , 1988; Laville et al , 2004]. However, west of the Atlas in the Doukkala basin, the first extensional episodes are younger and are dated as Rhaetian (∼210Ma) [ Medina , 1995; Le Roy , 1997; Le Roy and Piqué , 2001].…”

Section: Geological Settingmentioning

confidence: 99%

Kinematic and thermal evolution of the Moroccan rifted continental margin: Doukkala-High Atlas transect

Gouiza¹,

Bertotti²,

Hafid

et al. 2010

Tectonics

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[1] The Atlantic passive margin of Morocco developed during Mesozoic times in association with the opening of the Central Atlantic and the Alpine Tethys. Extensional basins formed along the future continental margin and in the Atlas rift system. In Alpine times, this system was inverted to form the High and Middle Atlas fold-and-thrust belts. To provide a quantitative kinematic analysis of the evolution of the rifted margin, we present a crustal section crossing the Atlantic margin in the region of the Doukkala Basin, the Meseta and the Atlas system. We construct a post-rift upper crustal section compensating for Tertiary to present vertical movements and horizontal deformations, and we conduct numerical modeling to test quantitative relations between amounts and distribution of thinning and related vertical movements. Rifting along the transect began in the Late Triassic and ended with the appearance of oceanic crust at 175 Ma. Subsidence, possibly related to crustal thinning, continued in the Atlas rift in the Middle Jurassic. The numerical models confirm that the margin experienced a polyphase rifting history. The lithosphere along the transect preserved some strength throughout rifting with the Effective Elastic Thickness corresponding to an isotherm of 450°C. A mid-crustal level of necking of 15 km characterized the pre-rift lithosphere. Citation: Gouiza, M., G.Bertotti, M. Hafid, and S. Cloetingh (2010), Kinematic and thermal evolution of the Moroccan rifted continental margin: Doukkala-High Atlas transect, Tectonics, 29, TC5008,

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“…The main references are Petit & Beauchamp (1986), Benaouiss et al (1996), Jalil (1999, Oujidi & Elmi (2000), , Ouarhache et al (2000), Tourani et al (2000), El Arabi E.H. et al (2003, 2006a,b), and El Arabi E.H. (2007. Concerning the associated basalt flows, the most recent and general references are Youbi et al (2003), Knight et al (2004), Marzoli et al (2004), Verati et al (2007), and Nomade et al (2007).…”

Section: The Earliest Rifting From Permian To Early Sinemurianmentioning

confidence: 98%

“…4.7B). The fluviatile-lacustrine/palustrine beds of this sequence have been dated palynologically from the Middle Anisian in the central sub-basin (El Arabi et al, 2006a). The overlying, unconformable sequence (TS III) corresponds to the famous Oukaimeden Sandstone Fm.…”

Section: The Earliest Rifting From Permian To Early Sinemurianmentioning

confidence: 99%

The Atlas System

Lamotte

Zizi

Missenard

et al.

Lecture Notes in Earth Sciences

118

114

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Première caractérisation palynologique du Trias moyen dans le Haut Atlas ; implications pour l'initiation du rifting téthysien au Maroc

Abstract: L'Anisien moyen est caractérisé palynologiquement pour la première fois, à l'échelle du Maroc tout entier, dans le Haut Atlas de Marrakech. Les implications stratigraphiques, tectoniques et paléogéographiques de cette découverte sont analysées. Pour citer cet article :

Cited by 46 publications

References 10 publications

Morphology, internal architecture and emplacement mechanisms of lava flows from the Central Atlantic Magmatic Province (CAMP) of Argana Basin (Morocco)

Morphology, internal architecture and emplacement mechanisms of lava flows from the Central Atlantic Magmatic Province (CAMP) of Argana Basin (Morocco)

Kinematic and thermal evolution of the Moroccan rifted continental margin: Doukkala-High Atlas transect

The Atlas System

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