RechercherTitres

untitled
<OAI-PMH schemaLocation=http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd> <responseDate>2018-01-15T15:41:54Z</responseDate> <request identifier=oai:HAL:hal-00407600v1 verb=GetRecord metadataPrefix=oai_dc>http://api.archives-ouvertes.fr/oai/hal/</request> <GetRecord> <record> <header> <identifier>oai:HAL:hal-00407600v1</identifier> <datestamp>2018-01-11</datestamp> <setSpec>type:ART</setSpec> <setSpec>subject:sdu</setSpec> <setSpec>subject:sde</setSpec> <setSpec>collection:CNRS</setSpec> <setSpec>collection:UNIV-BPCLERMONT</setSpec> <setSpec>collection:UNIV-ST-ETIENNE</setSpec> <setSpec>collection:INSU</setSpec> <setSpec>collection:SDE</setSpec> <setSpec>collection:GM</setSpec> <setSpec>collection:LMV</setSpec> <setSpec>collection:GIP-BE</setSpec> <setSpec>collection:PRES_CLERMONT</setSpec> <setSpec>collection:AGROPOLIS</setSpec> <setSpec>collection:B3ESTE</setSpec> <setSpec>collection:UNIV-AG</setSpec> <setSpec>collection:UNIV-MONTPELLIER</setSpec> <setSpec>collection:OPGC</setSpec> </header> <metadata><dc> <publisher>HAL CCSD</publisher> <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, 26–35]. 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> </dc> </metadata> </record> </GetRecord> </OAI-PMH>