Évolution des environnements littoraux du bassin de Melilla-Nador (Nord-Est Maroc) au Messinien supérieur entre 6,0 et 5,77 Ma |
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Authors: | Fré dé ric Garcia,Gilles Conesa,Jean-Jacques Corné e,Jean-Pierre André |
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Affiliation: | a UMR 6019 du CNRS, université de Provence, case 67, 13331 Marseille cedex 03, France b Laboratoire de géologie, EA 2644, université d’Angers, 2, boulevard Lavoisier, 49045 Angers cedex, France |
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Abstract: | This study of late Messinian deposits (E2 = TCC) from Melilla-Nador carbonate complex (Morocco) allowed us to characterize the environmental evolution between 6.0 and 5.77 Ma, which is a period considered as contemporaneous of the onset and development of the “messinian salinity crisis”. A statistical approach coupled together with classical petrographic study allows us to constrain the sedimentary dynamic of platforms and to propose deposition environment models. The Melilla-Nador platforms E2 deposits show a progressive continuous evolution of littoral environments in two major stages of available space creation and infill. The first stage corresponds to the build up of a reef complex between 6.0 and 5.85 Ma then the second stage, between 5.85 and 5.77 Ma, corresponds to the development of a mixed oolitic shallow ramp during the progressive infill of Melilla-Nador basin. The comparison with the Sorbas basin (Spain) TCC deposits exhibits a very close evolution of late Messinian littoral environments, which could be used as a correlation tool. |
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Keywords: | Melilla Maroc Messinien supé rieur «   Terminal Carbonate Complex  » Palé oenvironnement |
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