Biological metal accumulation in the red beds (Guettioua Member) of the Bathonian (Dogger) of Msemrir,Central High Atlas,Morocco |
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Authors: | Rolf Kohring |
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Institution: | (1) Present address: Institut für Paläontologie, Freie Universität Berlin, Schwendenerstraße 8, W-1000 Berlin 33, FRG |
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Abstract: | A fluviatile sequence is described from the Dogger (Bathonian) of Msemrir (Central High Atlas, Morocco). The base comprises laminites with fine clouds of galena and some zinc minerals, while the rest of the profile consists of point bars with conglomerates. Due to their limitation on lower energy levels, the sulphide minerals are interpreted as biological metal accumulations of bacterial metabolic processes.
Zusammenfassung Aus dem Dogger (Bathonium) vom Msemrir (Zentraler Hoher Atlas, Marokko) wird ein vorwiegend fluviatiles Profil beschrieben. An der Basis besteht es aus laminierten Serien, in denen feinverteilter Bleiglanz vorkommt. Am Top des Profils finden sich vor allem große Rinnenkörper mit Konglomeraten und vereinzelten Knochenresten. Die sulfidischen Vererzungen in den niedrig-energetischen Bereichen werden als biogenetische Anreicherungen, hervorgerufen durch bakterielle Umsetzungen, interpretiert.
Résumé Nous présentons et décrivons une séquence fluviatile du Bathonien de Msemrir (Haut Atlas Central, Maroc). La base est constituée de laminites dans lesquelles se trouve de la galène finement répartie. La couche suivante comporte de grands chenaux contenant des conglomérats et, ça et là, des débris osseux et des restes de végétaux. Les minéralisations sulfurées dans les zones de basse énergie sont interprétées comme des accumulations biogénétiques dues à une activité bactérienne.
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