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<title lang=en>Recent mobilization of U-series radionuclides in the Bernardan U deposit (French Massif Central)</title>
<creator>Condomines, Michel</creator>
<creator>Loubeau, O.</creator>
<creator>Patrier Mas, Patricia</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Magmas et Volcans (LMV) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<source>ISSN: 0009-2541</source>
<source>Chemical Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00407600</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00407600</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00407600</source>
<source>Chemical Geology, Elsevier, 2007, 244 (1-2), pp.304-315,. 〈10.1016/j.chemgeo.2007.06.020〉</source>
<identifier>DOI : 10.1016/j.chemgeo.2007.06.020</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2007.06.020</relation>
<language>en</language>
<subject lang=en>U-series disequilibria</subject>
<subject lang=en>Uranium-Ore</subject>
<subject lang=en>radionucleide mobility</subject>
<subject lang=en>radium</subject>
<subject lang=en>gamma spectrometry</subject>
<subject lang=en>Bernardan U-mine</subject>
<subject lang=en>episyenites</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Several nuclides of the ;238;U (;234;U, ;230;Th, ;226;Ra, ;210;Pb) and ;235;U (;231;Pa, ;227;Ac) decay series have been measured through gamma spectrometry in the U-bearing episyenites of the Bernardan mine (northwest Massif Central, France), in order to study recent mobilizations in the U-deposit and their time-scales. (;230;Th/;238;U) and (;231;Pa/;235;U) ratios show that U has been little affected during the last 350 ky, especially in the U-rich samples. In contrast, ;226;Ra was subjected to a general redistribution, with a clear tendency for Ra to be lost from the U-rich samples and added to U-poor samples. The highest Ra excesses are present in low-U samples, and are related to adsorption onto iron hydroxides. Ra appears to have been redistributed within the mineralised episyenitic bodies, which seem to remain in ;226;Ra;238;U radioactive equilibrium, a result consistent with the earlier study of Leroy [1984. Episyénitisation dans le gisement d'uranium du Bernardan (Marche): Comparaison avec des gisements similaires du Nord-Ouest du Massif Central français. Miner. Depos. 19, 2635]. As shown by the ;226;Ra and ;210;Pb data, the Ra redistribution was very active between 8 and 0.1 ky, and this might be a consequence of the hydrological changes in groundwater circulation accompanying the Holocene climate warming.</description>
<date>2007</date>
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