Geochemical and isotopic variations in the calc-alkaline rocks of Aeolian arc, southern Tyrrhenian Sea, Italy: constraints on magma genesis

Article Abstract:

Geochemical and isotopic analyses of calc-alkaline (CA) rocks from the Aeolian arc in southern Tyrrhenian Sea, Italy, revealed complex variations in the composition of the CA volcanics. Three main groups were identified, namely the Alicudi and Filicudi volcanics, the Panarea, Salina and Lipari (PSL) volcanics and the Stromboli suite. Isotopic variations between the three groups indicate the role of a crustal component in the evolution of the CA magmas. Crustal assimilation during subduction was also suggested as an explanation for such geochemical features.

Lipari Islands, Island arcs, Isotope geology

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Chemical zoning and crystallization mechanisms in the magma chamber of the Pomici di Base plinian eruption of Somma-Vesuvius (Italy)

Article Abstract:

The Pomici di Base plinian eruption of Somma-Vesuvius resulted in a chemically zoned plinian fall deposit due to the emptying of a normally stratified latite/trachyte magmatic reservoir. Minerals from the magma of the Pomici di Base were analyzed to investigate the chemical zoning and crystallization mechanisms. Results revealed several different types of crystals in a single pumice that were not formed through the mixing between magmas with different degree of evolution.

Italy, Crystals, Crystallization, Minerals, Minerals (Geology)

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Melilitites: partial melts of the thermal boundary layer?

Article Abstract:

A study shows that silica-poor and calcium-rich melilitites originate from partial melting of thermal boundary layer (TBL) at the base of the European lithosphere. A common source of these melilitites is mantle plumes rising beneath the lithosphere in oceanic and continental settings. A heterogenous carbonate-phlogopite lherzolite layer is formed when small degree, CO2-H2O-enriched partial melts of a rising mantle plume freeze at the base of lithosphere.

Europe

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