georefid:2006-055296SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1180/00264610670203222006-01-01publicationgeorefid:2006-055296doi:10.1180/0026461067020322Berger, JulienAfrica Museum, Section de Geologie Isotopique, Tervuren, BelgiumauthorFemenias, O.Universite Libre de Bruxelles, BelgiumauthorMercier, J. C. C.Universite de La Rochelle, FranceauthorDemaiffe, D.authorMineralogical Society, London, United KingdompublisherdocumentDigitalMineralogical Magazine70 (2)175-185The Limousin ophiolite (French Massif Central) occurs as elongate bodies forming a (nearly) continuous suture zone between two major lithotectonic units of the French Variscan belt. The mantle section of the ophiolite is made of diopside-bearing harzburgite, harzburgite and dunite characteristic of a lherzolite-harzburgite ophiolite type (LHOT). The plutonic section is essentially composed of troctolites, wehrlites and gabbros locally intruded by ilmenite-rich mafic dykes. All the rocks were strongly affected by an ocean-floor hydrothermal metamorphism. The composition and evolution of primary magmatic phases (olivine, clinopyroxene, plagioclase and spinel) throughout the lowermost magmatic sequence correspond to those described in oceanic cumulates (ODP data). The Limousin ophiolite is thus of MOR type instead of SSZ type. The whole lithological section, the mineral chemistry, the extensive hydrothermal oceanic alteration and the relatively thin crustal section are typical of a slow-spreading ridge ocean (i.e. Mid-Atlantic ridge). Comparison of the Limousin ophiolite with other ophiolites from European Variscides suggests that the oceanic domain was actively spreading during the Late Palaeozoic and extended from the Armorican massif to the Polish Sudetes.completedIgneous and metamorphic petrologySolid-earth geophysicsArmorican MassifCentral EuropeCentral Massifchain silicatesclinopyroxenedikesdiopsideEuropefeldspar groupframework silicatesFrancegabbrosharzburgitehydrothermal conditionsigneous rocksilmeniteintrusionslherzoliteLimousinmid-ocean ridgesmineral assemblagesnesosilicatesOcean Drilling Programocean floorsolivineolivine groupophioliteophiolite complexesorthosilicatesoxidesPaleozoicperidotitesplagioclaseplutonic rocksPolandPolish Sudeten Mountainspyroxene groupsea-floor spreadingsilicatesspinelSudeten Mountainstroctoliteultramaficsupper PaleozoicVariscidesWestern EuropeEnglishgeoscientificInformation0.30003.000045.000046.1000Limousinapplication/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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