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Comptes Rendus Géoscience
Volume 338, n° 1-2
pages 50-64 (janvier 2006)
Doi : 10.1016/j.crte.2005.10.007
Received : 4 October 2005 ;  accepted : 28 October 2005
Structural styles of the western onshore and offshore termination of the High Atlas, Morocco
Styles structuraux de la terminaison occidentale onshore et offshore du Haut Atlas, Maroc
 

Mohamad Hafid a, , Mahmoud Zizi b, Albert W. Bally c, Abdellah Ait Salem b
a Laboratoire de géophysique et dʼenvironnement, département de géologie, faculté des sciences, BP 133, Kénitra, Maroc 
b ONHYM, BP 3080, Rabat, Maroc 
c Rice University, Department of Geology and Geophysics, 6100 Main Street, Houston, TX 77005-1892, USA 

Corresponding author.

Written on invitation of the Editorial Board

Abstract

The present work aims (1) at documenting, by regional seismic transects, how the structural style varies in the western High Atlas system and its prolongation under the present-day Atlantic margin, (2) at understanding how this variation is related to the local geological framework, especially the presence of salt within the sedimentary cover, and (3) at discussing the exact geographic location of the northern front of the western High Atlas and how it links with the most western Atlas front in the offshore Cap Tafelney High Atlas. Previous work showed that the structural style of the Atlas belt changes eastward from a dominantly thick-skinned one in central and eastern High Atlas and Middle Atlas of Morocco to a dominantly thin-skinned one in Algeria and Tunisia. We propose here to show that a similar structural style change can be observed in the other direction of the Atlas Belt within its western termination, where the western High Atlas intersects at right angle the Atlantic passive margin and develops into a distinct segment, namely the High Atlas of Cap Tafelney, where salt/evaporite-based décollement tectonics prevail. To cite this article: M. Hafid et al., C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.
Résumé

Lʼobjectif du présent travail est (1) dʼillustrer, grâce à des coupes sismiques régionales, les variations du style structural au niveau du Haut Atlas occidental et son prolongement sous lʼocéan Atlantique actuel, (2) de comprendre comment ces variations sont liées au cadre géologique local, notamment à la présence du sel au sein de la couverture sédimentaire, et (3) de discuter la localisation exacte du front nord-atlasique et sa relation avec le front le plus occidental de la chaîne au niveau du Haut Atlas du cap Tafelney, dans lʼoffshore atlantique. Des travaux antérieurs ont montré que le style structural de lʼAtlas change latéralement dʼouest en est, dʼun style à dominante thick-skin dans le Haut Atlas central et oriental marocain, à un style à dominante thin-skin dans lʼAtlas algérien et lʼAtlas tunisien. Nous proposons de montrer ici quʼun changement latéral similaire peut être observé dans lʼautre direction, en allant du Haut Atlas central vers la terminaison occidentale de la chaîne, où le Haut Atlas intercepte la marge atlantique et forme un segment atlasique sous-marin distinct, caractérisé par un style tectonique de décollement lié à la présence massive du sel triasique. Pour citer cet article : M. Hafid et al., C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.

Keywords : Western High Atlas, High Atlas of Cap Tafelney, Atlas front, Jebilet, Thin-skin/thick-skin deformation, Morocco

Mots-clés : Haut Atlas occidental, Haut Atlas du cap Tafelney, Front atlasique, Jebilet, Déformation thin-skin /thick-skin , Maroc




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