238 U– 230 Th– 226 Ra disequilibria in the Lesser Antilles arc: implications for mantle metasomatism
作者: François ChabauxChristophe HémondClaude J. Allègre
作者单位: 1Laboratoire de Géochimie et Cosmochimie, Institut de Physique du Globe de Paris, 4, Place Jussieu, 75252 Paris Cedex 05, France
2Centre de Géochimie de la Surface, Ecole et Observatoire des Sciences de la Terre, 1, rue Blessig, 67084 Strasbourg Cedex, France
3Max-Planck-Institut für Chemie, Abteilung Geochemie, Postfach 3060, 55020 Mainz, Germany
刊名: Chemical Geology, 1999, Vol.153 (1), pp.171-185
来源数据库: Elsevier Journal
DOI: 10.1016/S0009-2541(98)00160-0
关键词: 238 U– 230 Th– 226 Ra disequilibriaLesser AntillesMantle metasomatism
原始语种摘要: Abstract(#br)238 U– 230 Th– 226 Ra disequilibria have been determined on historical lava flows from several active volcanoes of the Lesser Antilles Arc. The data reveal significant correlations between 238 U– 230 Th and 230 Th– 226 Ra disequilibria suggesting that they share a common and recent origin. The position of subduction zone derived samples in the Th/U vs. Th/Ba diagram and in the ( 238 U/ 232 Th ) vs. ( 230 Th/ 232 Th ) isochron diagram are consistent on both global and regional (Lesser Antilles arc) scales. This constitutes certainly a strong argument for linking the ( 238 U/ 230 Th ) and ( 230 Th/ 232 Th ) ratios variations of the subduction-related lavas to the U–Th–Ba mantle wedge enrichment. For the Lesser Antilles lavas, models relating directly both 238 U– 230 Th and 230...
全文获取路径: Elsevier  (合作)
影响因子:3.154 (2012)