On the geovolcanological and morphological evolution of an endogenous dome (Pantelleria,Mt. Gelkhamar) |
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Authors: | Dr L Villari |
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Institution: | (1) Present address: Institut International de Recherches Volcanologiques (I. I. R. V.), Viale Regina Margherita, 6, 95 123 Catania, Sizilien, Italien |
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Abstract: | The author describes the outcrops and chemico-petrographical characteristics of volcanites as referred to an eruptive centre in the NW of the Island of Pantelleria (Sicilian Channel).The survey carried out on this subject permitted the reconstruction of the particular eruptive mechanism which determined the formation of an endogenous dome.The volcanites in question, quartziferous sodatrachytes, alternate, in their outcrops, with hawaiitic lavas originating from eruptive centres situated in the immediate vicinity.The alternating of basic magmas and acid magmas within a restricted area supplies a further valid evidence for ascribing the origin of the quartziferous sodatrachytes to contact anatexis. On the other hand they have such a particular chemical composition, that cannot be found in other trachytes of orogenic and cratonic zones.
Zusammenfassung Der Verfasser beschreibt das Vorkommen und die petrographisch-chemischen Eigenschaften der Vulkanite eines Ausbruchszentrums im NW-Teil der Insel Pantelleria. Aufgrund dieser Untersuchungen wird der Ausbruchsmechanismus rekonstruiert, der zur Bildung einer geborstenen Staukuppe führte.Die quarzführenden natrontrachytischen Laven dieser Kuppe wechsellagern mit hawaiitischen Vulkaniten, die aus benachbarten Ausbruchszentren stammen.Die abwechselnde Förderung von basischen und sauren Magmen in einem engbegrenzten Gebiet wird als Beweis für eine kontaktanatektische Entstehung der natrontraehytischen Magmen angeführt, deren eigenartige Zusammensetzung überdies von derjenigen der Trachyte aus Orogengebieten grundsätzlich abweicht.
Résumé L'auteur décrit le gisement et les caractères pétrographiques et pétrochimiques des laves d'un centre éruptif dans la partie NO de l'Île de Pantelleria. Sur la base de ces observations il reconstitue le mécanisme éruptif qui a déterminé la formation d'un dôme endogène rompu.Les laves trachytiques sodiques quartzifères du dit dôme se trouvent intercalées dans les produits hawaiitiques provenants de centres éruptifs voisins.Cette alternance d'éruptions basiques et acides est un argument en faveur d'une origine anatectique de contact des magmas trachytiques sodiques qui, en outre, ont une composition minéralogique et chimique très différente de celle des roches trachytiques des régions orogéniques.
Riassunto L'Autore descive la giacitura ed i caratteri chimico-petrografici delle vulcaniti riferibili ad un centro eruttivo posto nella parte Nord-occidentale dell'Isola di Pantelleria (Canale di Sicilia). Le osservazioni condotte su tale argomento hanno consentito la ricostruzione del particolare meccanismo eruttivo che ha determinato la formazione di un edificio vulcanico costituito da una cupola di ristagno.Le vulcaniti in questione, di natura sodatrachitica quarzifera, sono alternate, nella loro giacitura, a lave di tipo hawaiitico provenienti dai centri eruttivi posti nelle immediate vicinanze.L'altemarsi di eruzioni di magmi basici e di magmi acidi entro un'area ristretta fornisce un ulteriore valido elemento per ascrivere ad anatessi di contatto l'origine delle sodatrachiti quarzifere in oggetto, il cui chimismo è daltronde talmente particolare che non trova riscontro in analoghi termini di zone orogeniche e cratoniche.
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Dedicated to Professor Dr. A.Rittmann on the occasion of his 75. birthday |
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Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
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