Fe and Mn in calcites cementing red beds: A record of oxidation–reduction conditions: Examples from the Catalan Coastal Ranges (NE Spain) |
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| Authors: | D Parcerisa D Gmez-Gras A Trav JD Martín-Martín E Maestro |
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| Institution: | aCentre de Géosciences, École des Mines de Paris, 77305 Fontainebleau Cedex, France;bDpt. de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalunya, Spain;cDpt. de Geoquímica, Petrologia i Prospecció Geològica, Facultat de Geologia, Universitat de Barcelona, 08071 Barcelona, Catalunya, Spain;dDepartment of Earth Sciences, Uppsala University, 75-236 Uppsala, Sweden |
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| Abstract: | Fe and Mn occur in calcite cements depending on the oxidizing–reducing conditions of cementing waters, which may change according to depositional and diagenetic environments. In red beds, Mn and Fe are available from the ferruginous matrix. Thus, it is possible to know the oxidizing–reducing conditions of fluids that precipitated calcite as a function of Mn and Fe content in calcite cement. A detailed petrological (with special attention to cathodoluminescence) and geochemical analysis of these cements is a useful tool to constrain the diagenetic evolution of red beds and the history of the basin where they deposited. |
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| Keywords: | Oxidizing– reducing conditions Calcite cement Red beds Cathodoluminescence |
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