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Aeolian island arc (South Tyrrhenian Sea) magma heterogeneites in historical lavas: Sr and Pb isotopic evidence

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Abstract

Historical volcanic rocks of the Aeolian islands range in composition from shoshonitic basalts to rhyolites, which might reflect fractional crystallization of a shoshonitic parent magma. However Sr and Pb isotopic data indicate a more complex history. The shoshonitic basalts at present erupted at Stromboli, although chemically similar to the postulated parent magma, are genetically unrelated to the other studied rocks.

Sr isotopes indicate that Vulcano, Vulcanello and Lipari had independent magma sources. It is proposed that crustal contamination raised the Sr isotopic composition of the Lipari rhyolites. The rocks of these island are related by a common very steep trend of207Pb/204Pbvs. 206Pb/204Pb. Such a trend is a common feature of orogenic magmas and shows that Pb was derived by mixing of at least two components. Presently it is impossible to constrain precisely either the timing or the physical meaning of the Pb end members. The Pb isotopic trend in the Eolian island is very distinct from those recorded in volcanic rocks both from behind the arc (Etna, Iblean Mts.) and from Central and Southern Italy.

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  1. Istituto di Geologia e Geofisica, Largo S. Marcellino 10, Napoli, Italy

    M. Cortini

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Cortini, M. Aeolian island arc (South Tyrrhenian Sea) magma heterogeneites in historical lavas: Sr and Pb isotopic evidence. Bull Volcanol 44, 711–722 (1981). https://doi.org/10.1007/BF02597093

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