Signification paléoécologique des assemblages de diatomées du Messinien dans le bassin de Melilla-Nador (Rif Nord-Oriental, Maroc) |
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Authors: | Simona Saint MartinGilles Conesa Jean-Paul Saint Martin |
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Institution: | a Université de Bucarest, faculté de géologie et géophysique, 1, boulevard N.-Balcescu, Bucarest, Roumanie et université de Provence, centre de sédimentologie-paléontologie, 3, place Victor-Hugo, 13331 Marseille cedex 03, France b UMR 6019 CNRS, université de Provence, 3, place Victor-Hugo, 13331 Marseille cedex 03, France |
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Abstract: | In the Melilla-Nador basin, the diatomites represent one of the main sedimentary components of the Messinian together with reefal carbonate platforms. Two vertical sections were realised in the diatomitic levels from distal platform. Diatom assemblages are for the first time described in this basin. A total of 125 diatom species were determined: 73 centrics and 52 pennates. Significant diatom assemblages defined from the statistical analysis indicate ecological variations concerning diatomitic levels or parts of diatomitic levels. Using the data sets we propose paleoenvironmental models showing the complexity of the ecological interactions. This study point the permanence of opened marine environment, the impulse of cold waters from Atlantic origin, a general decrease in bathymetry in the Messinian marls-diatomitic series, the influence of the carbonate platform progradation and the occurrence of upwelling systems. |
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Keywords: | Diatomé es Palé oé cologie Milieu marin Messinien Maroc |
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