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Interpretation of gamma-ray logs: The distribution of uranium in carbonate platform |
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| Authors: | Mohamed Chaker Raddadi Annie Arnaud Vanneau Grard Poupeau Elisabeth Carrio-Schaffhauser Hubert Arnaud Alice Rivera |
| Institution: | aLGCA–OSUG, UMR 5025, CNRS–université Grenoble-1, 1381, Maison des Géosciences, domaine universitaire de Saint-Martin-d'Hères, 38000 Grenoble, France;bIRAMAT, UMR 5060, CNRS–université Bordeaux-3, CRP2A–Maison de l'Archéologie, Esplanade des Antilles, 33607 Pessac, France;cLGIT–OSUG, UMR 5559, CNRS–université, Maison des Géosciences, domaine universitaire de Saint-Martin-d'Hères, France;dCentro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, Urca, 22290-180 Rio de Janeiro, Brazil |
| Abstract: | High gamma-radioactivity in carbonates is usually ascribed to uranium of detrital minerals and organic matter, and to thorium and potassium of clays. The present study based on Urgonian marls and marly limestones (France) shows that some of the most radioactive values correspond instead to some ‘pure’ limestones. These peaks are generally associated with a sequence boundary or a maximum flooding surface. Low-level γ-spectrometry and ICP–MS analyses show that although high radioactivities are mostly associated with uranium, there is no obvious correlation between uranium enrichment and lithology. Also, correlation between high radioactivity and argillaceous beds might not be systematic. To cite this article: M.C. Raddadi et al., C. R. Geoscience 337 (2005). |
| Keywords: | Gamma-ray Well-logging Carbonate platform Urgonian FranceMots-clé s: Gamma-ray Diagraphies Carbonates de plate-forme Urgonien France |
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