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Comptes Rendus Géoscience
Volume 336, n° 2
pages 109-116 (février 2004)
Doi : 10.1016/j.crte.2003.10.024
Received : 28 May 2003 ;  accepted : 7 October 2003
Les microbialites de l'Anti-Atlas occidental (Maroc) : marqueurs stratigraphiques et témoins des changements environnementaux au Cambrien inférieur
Stratigraphic and environmental significance of the Lower-Cambrian western Anti-Atlasic microbialites (Morocco)

Mohammed  Benssaou a * ,  Naima  Hamoumi b
aDépartement de géologie, faculté des sciences, université Ibn-Zohr, Agadir, Maroc 
bDépartement de géologie, faculté des sciences, université Mohammed-V, Rabat, Maroc 

*Auteur correspondant.
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Les différents types de microbialites reconnus dans la succession du Cambrien inférieur de l'Anti-Atlas occidental traduisent des variations paléo-bathymétriques du milieu marin. L'aspect laminé des microbialites, à la base de la succession, représente une forme d'adaptation des stromatolites non calcifiées aux conditions hydrodynamiques du milieu littoral. L'approfondissement du milieu et le phénomène de calcification permettent, par la suite, un développement vertical des calcimicrobes qui érigent des biohermes thrombolitiques subtidaux. À l'issue d'un second stade d'élévation du niveau marin, l'apparition des archéocyathes récifaux, dont le squelette branchu joue le rôle d'un substrat rigide, permet aux calcimicrobes d'acquérir une forme dendritique. Pour citer cet article : M. Benssaou, N. Hamoumi, C. R. Geoscience 336 (2004).

Mots clés  : Anti-Atlas ; Cambrien inférieur ; microbialites ; archeocyathes ; niveau marin ; Maroc.

Abstract

Three microbialite forms are recognized in the Lower-Cambrian succession of Irherm area in the western Anti-Atlas (Morocco). Stromatolites, which correspond to non-calcified shallow marine laminated microbialites, are well developed in the basal Lower-Cambrian succession. Occurrence of calcified microbial thrombolites, in the middle part of this succession, reflects an increasing sea level from the peritidal zone to the subtidal environment. In the upper part of this succession, a second increasing water depth event and the development of branching archaeocyathan reefal framework lead to dendritic microbialite emergence. To cite this article: M. Benssaou, N. Hamoumi, C. R. Geoscience 336 (2004).

Mots clés  : Anti-Atlas ; Lower Cambrian ; microbialites ; archaeocyathes ; sea level ; Morocco.




© 2003  Académie des sciences@@#104156@@

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