La transgression thanétienne (Paléocène supérieur) dans l’Aurès occidental (Algérie), d’après les associations de Foraminifères de la coupe d’El Kantara |
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Authors: | Leïla Belkhodja Gérard Bignot |
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Institution: | a Section ensembles sédimentaires, département de géologie, université des sciences et de la technologie Houari-Boumediène (USTHB), BP 32, El-Alia, 16111 Bab-Ezzouar, Alger, Algérie b Laboratoire de micropaléontologie, département de géologie sédimentaire, CNRS (FRE 2400), université Pierre-et-Marie-Curie, 4, place Jussieu, C104, 75252 Paris cedex, France |
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Abstract: | In the W-Aures (Algeria), the El Kantara pass displays about 50 m of Red Marls overlying the Maastrichtian limestones with Laffitteina. The Red Marls are, in their turn, overlain by the Thanetian marly limestones of the river El Haï. The micropaleontological inventory of these Red Marls establishes the co-occurrence of subaerian (Microcodium = Paronipora), fresh-water (Charophyta) and marine microfossils (Foraminifers). The stratigraphical significance of these microfossils is discussed. The upper part of the Red Marls, yielding abundant Valvulina and scarce Glomalveolina, is of Thanetian age. The age of the lower part is less established, but the occurrence of Microcodium suggests a Thanetian age too. Located at the margin of the northern opening of the trans-Saharan epeiric sea, the El Kantara section establishes a Thanetian age for the beginning of the Paleocene transgression. Danian deposits are missing, in spite of the absence of an obvious hiatus on the field. After general emersion during the early Paleocene, the Thanetian transgression starts with the set up of lakes at the depositional area of the Red Marls. Marine influences, limited at first, become gradually prevailing, and end with the deposition of neritic marly limestones of river El Haï. |
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Keywords: | Algé rie Aurè s Cré tacé Maastrichtien Palé ocè ne Thané tien Foraminifè res benthiques |
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