par Honnorez, José 
;Keller, Jörg
Référence Geologische Rundschau, 57, 3, page (719-736)
Publication Publié, 1968-10
;Keller, JörgRéférence Geologische Rundschau, 57, 3, page (719-736)
Publication Publié, 1968-10
Article révisé par les pairs
| Résumé : | The authors give a brief description and their interpretation of the different types of xenoliths found in the volcanites of the Eolian Islands. The petrologic study of the xenoliths leads them to conclusions about the nature of the islands' basement and about the paleogeography of the Tyrrhenean Sea. Presence or absence of rock types among the xenoliths limit the possibility for anatexis and assimilation in magma generation and differentiation. Xenoliths transformed by contact metamorphism into cordierite-potash feldspar-hornfelses, plagioclase-pyroxene-hornfelses, calc-silicate-hornfelses, quarzites are witnesses of a thick sedimentary cover, corresponding lithologically to the miopliocene sedimentary cover of the Calabro-Peloritanian massif. Xenoliths of sillimanite-garnet-gneisses, amphibolites and hornblendites and of granitic to granodioritic plutonic rocks prove the existence, under the sedimentary cover, of a basement formed by typical sialic rocks. At Stromboli where hornfelses of sedimentary origin are well represented, up to now no gneissic or granitic xenoliths have been found. The opinion that a sialic basement could be absent beneath this island conforms with the absence of acid (liparitic) lavas. © 1968 Ferdinand Enke Verlag Stuttgart. |
