REE geochemistry of eclogites and associated rocks from Sauviat-sur-Vige, Massif Central, France

Representative samples of metagabbros, eclogites and a garnet peridotite from the Massif de Sauviat-sur-Vige (West Massif Central) have been analyzed for major and trace elements (including REE). The LREE enriched patterns are distinct from those of modern MORB but resemble those of continental or ocean island tholeiites. An intraplate tectoning setting is thus inferred. Geochemical modeling using REE and major element contents suggests that all the rock types might be related genetically by fractional crystallization, and, in some instances, by mixing of cumulates and differentiated liquid as in the case of the garnet peridotite. P, T estimates from microprobe analyses of coexisting garnet-clinopyroxene pairs yield about 820°C, and P > 15 kb for the eclogite facies metamorphism.