Info utili

Articoli correlati

Valutazione attuale:  / 0

Geochemistry of selected lavas of the Panarea volcanic group, Aeolian Arc, Italy

A. L. Doherty1 & C. Cannatelli1  & F. Raia2 & H. E. Belkin3 & S. Albanese1 & A. Lima1 & B. De Vivo1
1 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, University of Naples – Federico II, Via Mezzocannone, 8, Naples 80134, Italy
2 Department of Education & Department of Medicine, University of California, Los Angeles, CA, USA
3 U.S. Geological Survey, 11142 Forest Edge Dr, Reston, VA 20190, USA
Miner Petrol (2015) 109:597–610
DOI 10.1007/s00710-015-0385-3
The Panarea Volcanic Group (PVG) is a group of emergent islands rising from the truncated cone of an underwater edifice in the eastern sector of the Aeolian Island Arc in the Tyrrhenian Sea, Italy. Selected lava units from the main island of Panarea and some of the nearby islets were analysed for their major and trace element compositions to the dataset available in the literature. Major mineral phases were identified as plagioclase ± clinopyroxene ± orthopyroxene ± olivine ± amphibole ± mica. The lavas of this study range from andesite to rhyolite with major element compositions equivalent to previously published data. Pyroxene geobarometry suggests a polybaric distribution to crystal fractionation, beginning at the Moho, and continuing to a shallow magma reservoir, at approximately 0.8 km depth.A plot ofNd143/Nd144 vs. Sr87/Sr86 show the compositions of Panarea overlap with the compositions of the eastern and central Aeolian Arc, while Pb208/Pb204 vs. Pb206/Pb204 do not overlap, but fall between the central and eastern arc values. As major and trace element concentrations, and isotope compositions of the lavas of this study overlap most consistently with lava compositions from the central and eastern Aeolian Arc, indicating Panarea should be considered an Bintermediate^ volcano in the arc.
Fig. 1
Simplified geological map showing the main volcanic rock units in the PVGand location of sample sites of this study (sample locations are indicative - modified after Lucchi et al. 2013c,d and references therein). See original reference for full unit descriptions. Formation labels are (in alphabetical order): ba Basiluzzo, cb Cala Bianca, cs Castello, fc Punta Falcone 2, fl Punta Falcone 1, fo Le Formiche, gr Piano Grotte dei Rossi, gt Grotta del Tabacco, lb Lisca Bianca, lf La Fossa, pa Palisi, pc Punta Cardosi, pi Pianoconte, pt Punta del Tribunale, so Soldata, to Torricella