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- W2013263886 abstract "Mn contents analysis of pelagic carbonates from the Upper Jurassic of the Vocontian trough (Châteauneuf-d'Oze section, Hautes-Alpes) allowed the definition of six third-order eustatic sequences that agree with the chronostratigraphic chart [17]. Cathodoluminescence intensity enables a semi-quantitative approach of Mn trapped in the calcite lattice; thus, CL-results show that most of Mn is found in the pelagic limestones as Mn2+. The Mn content variations observed in the low stands (low Mn contents) and in the high-stand systems tract samples (high Mn contents) reflect the sea water Mn content variations, which appear to be linked to the hydrothermal activity, especially by the ocean ridge. In the Vocontian realm, third-order sequences of the Upper Jurassic seem to be controlled by tectono-eustatism. Les variations des teneurs en Mn des carbonates hémi-pélagiques du Jurassique supérieur vocontien (coupe de Châteauneuf-d'Oze, Hautes-Alpes) permettent de définir six séquences de 3e ordre, en accord avec la charte des cycles eustatiques [17]. La cathodoluminescence permet une évaluation semi-quantitative des concentrations en Mn2+ incorporé dans le réseau de la calcite. Cette forme représente la plus grande part du manganèse dosé par AAS après attaque acide. Les différences observées entre les cortèges de bas niveau (faibles teneurs) et les cortèges de haut niveau (fortes teneurs) reflètent donc les variations de concentration dans le milieu océanique. L'activité des dorsales, par l'intermédiaire de l'hydrothermalisme sous-marin, semble être le mécanisme responsable de telles fluctuations. De ce fait, les séquences de 3e ordre étudiées paraissent contrôlées par le tectono-eustatisme." @default.
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- W2013263886 date "2000-03-01" @default.
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- W2013263886 title "Apport de la cathodoluminescence à la connaissance de la spéciation du manganèse dans les carbonates pélagiques" @default.
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- W2013263886 doi "https://doi.org/10.1016/s1251-8050(00)00148-8" @default.
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