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Petrology of some volcanic rock series of the Aeolian arc, Southern Tyrrhenian Sea: Calc-alkaline and shoshonitic associations

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Abstract

In the Aeolian island arc two different magmatological associations, calc-alkaline andesite series and shoshonites, occur in close vicinity. Although both associations erupted simultaneously during the last glaciation, there is a general tendency for the calc-alkaline rocks to be older. Shoshonitic activity is still going on.

Calc-alkaline lavas include high-Al basalts, andesites and dacites, with the general characteristics of the island-arc type andesite series. Large cation trace elements (Rb, Ba, Sr) however are distinctly enriched.

Shoshonite series include trachybasalts and latites, with which potassium-rich rhyolites can be associated. Leucite tephrites and potassic trachytes form a different evolution trend of the shoshonitic association.

Petrology relates both associations of the Aeolian Islands to the island arc dynamics which is presently characterized by deep-focus earthquakes in the depth range of 200–350 km. The present-day gap in seismic activity from 50–200 km coincides with the present-day lack of calc-alkaline volcanic activity and is explained by the model of a detached slab which continues to sink into the mantle.

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  1. Mineralogical Institute, University of Freiburg, Germany

    Jörg Keller

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Keller, J. Petrology of some volcanic rock series of the Aeolian arc, Southern Tyrrhenian Sea: Calc-alkaline and shoshonitic associations. Contr. Mineral. and Petrol. 46, 29–47 (1974). https://doi.org/10.1007/BF00377991

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