Geochemistry and petrology of meta-igneous granulitic xenoliths in Neogene volcanic rocks of the Massif Central,France — implications for the lower crust |
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| Authors: | J Dostal C Dupuy A Leyreloup |
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| Institution: | 1. Department of Geology, Saint Mary''s University, Halifax, Nova Scotia Canada;2. Centre Géologique et Géophysique, U.S.T.L., 34060 Montpellier Cedex France;3. Laboratoire de Pétrologie, U.S.T.L., 34060 Montpellier Cedex France |
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| Abstract: | Meta-igneous mafic and ultramafic rocks, which constitute about 60% of the granulitic xenoliths enclosed in the Neogene alkali basalts of the Bournac pipe (French Massif Central) have well preserved magmatic trends of element variations. The meta-igneous suite was probably derived from at least two different parental magmas and it may be a part of a gabbroic complex which resembles mafic bodies associated with anorthosites. The xenoliths are also very similar to many other granulitic xenoliths and to meta-igneous mafic granulitic massifs. This indicates that the gabbroic intrusions may be widespread in the lower crust and the close association of gabbroic rocks with meta-sedimentary granulites suggests a model for the composition of the lower continental crust. |
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