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Comptes Rendus Géoscience
Volume 338, n° 1-2
pages 92-114 (janvier 2006)
Doi : 10.1016/j.crte.2005.11.011
Received : 4 October 2005 ;  accepted : 17 November 2005
Pressure-temperature-time constraints on the Maghrebide mountain building: evidence from the Rif-Betic transect (Morocco, Spain), Algerian correlations, and geodynamic implications
Contraintes pression-température-temps sur lʼédification des Maghrébides : données rifo-bétiques (Maroc, Espagne), corrélations algériennes et implications géodynamiques
 

André Michard a, , François Negro a, Omar Saddiqi b, Mohamed L. Bouybaouene c, Ahmed Chalouan c, Raymond Montigny d, Bruno Goffé a
a Laboratoire de géologie (UMR 8145 CNRS), École normale supérieure, 24, rue Lhomond, 75231 Paris cedex 05, France 
b Laboratoire de géodynamique et thermochronologie, faculté des sciences Aïn-Chock, BP 5366, Casablanca Maarif, Maroc 
c Département de géologie, faculté des sciences, BP 1014, Rabat Agdal, Maroc 
d École et Observatoire des sciences de la Terre (UMR 7516), 5, rue Descartes, 67084 Strasbourg cedex, France 

Corresponding author.

Written on invitation of the Editorial Board

Abstract

The internal = northern zones of the Maghrebide belt includes allochthonous massifs that define, together with those from the Betics, Sicily and Calabria, a disrupted Alkapeca' terrane. In the Rif transect, taking advantage of new thermobarometric and geochronologic studies, we recognize a metamorphic complex with a mostly non-Alpine upper plate (Dorsale, Ghomarides-Malaguides), and a lower plate (Sebtides-Alpujarrides) affected by HP-LT, then HT-LP Alpine metamorphism. Some eastern Rif allochthons (Temsamane area) display MP metamorphism and could represent either Sebtide inliers or slivers from the African paleomargin. The Sebtide-Alpujarride late HT event also affects the bottom of the Ghomaride-Malaguide complex and can be related to the onset of the Alboran Sea rifting at  , whereas their HP event is ascribed to an earlier ( ?), north- to northeast-dipping subduction event. A review of the Algerian literature allows us to infer a similar structure and evolution for the Kabylides. The Alkapeca disruption is classically explained by back-arc extension above the retreating subduction of the Ligurian-Maghrebian oceanic lithosphere. The question of whether the latter subduction followed an earlier and opposite Alpine-Betic (Nevado-Filabride) subduction or not, remains open to discussion. To cite this article: A. Michard et al., C. R. Geoscience 338 (2006).

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Résumé

Les zones internes = septentrionales des Maghrébides comportent des massifs allochtones qui définissent, avec celles des Bétiques, de Sicile et de Calabre, un terrain « Alkapeca » démembré. Dans le transect rifain, ces Internides forment un complexe métamorphique comportant une plaque supérieure (Dorsale, Ghomarides-Malaguides), presque sans métamorphisme alpin, et une plaque inférieure (Sebtides-Alpujarrides) affectée par des événements alpins HP-BT, puis HT-BP. Ce dernier événement affecte aussi la base des Ghomarides-Malaguides et peut être rattaché au début du rifting de la mer dʼAlboran, vers 25-22 Ma, tandis que le premier est attribuable à une subduction à pendage NNE vers 30-25 Ma (?). Une revue de la littérature algérienne indique quʼune structure et une évolution comparables caractérisent les Kabylides. La fragmentation dʼAlkapeca est classiquement expliquée par extension arrière-arc et le retrait de la subduction océanique liguro-maghrébine. Lʼéventualité dʼune subduction alpine-bétique (Névado-Filabrides) antérieure et de sens opposé demeure une question ouverte à la discussion. Pour citer cet article : A. Michard et al., C. R. Geoscience 338 (2006).

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

Keywords : Gibraltar Arc, Mediterranean, Metamorphism, Geochronology, Alpine peridotites, Tectonics

Mots-clés : Arc de Gibraltar, Méditerranée, Métamorphisme, Géochronologie, Péridotites alpines, Tectonique




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