Abstract We present major and trace element data on clinopyroxene‐hosted, glassy melt inclusions (MIs) from a highly enriched (high 87 Sr/ 86 Sr = 0.71856) lava (ALIA‐D115‐18) the Samoan hot spot. Following correction for post‐entrapment crystallization, MIs are trachytic (62.6–65.4 wt% SiO 2 , 1.5–3.0 MgO, 7.2–10.6 total alkalis (Na O + K O)) ALIA‐D115 lavas dredged off submarine flanks of Sav...

Abstract The pressure dependence of the exchange Cr between clinopyroxene and garnet in peridotite is applicable as a geobarometer for mantle-derived Cr-diopside xenocrysts xenoliths. most widely used calibration (Nimis Taylor Contrib Miner Petrol 139: 541–554, 2000; herein NT00) performs well at pressures below 4.5 GPa, but has been shown to consistently underestimate above GPa. We have experi...

Clinopyroxenes along the Jervisite (NaScSi2O6)-Diopside (CaMgSi2O6) join have been studied, and a solid-solution of the type (Na(1-x)Ca(x))(Sc(1-x)Mg(x))Si2O6 has been identified in the full range of 0 ≤ x ≤ 1. The powder X-ray patterns of all the phases indicate a structural similarity to the end compounds and show smooth variation of structural parameters with composition. The linear structur...

Abstract Arc magmatism is fundamental to the generation of new continental or island arc crust. However, mechanisms that add chemical complexity natural calc-alkaline magmas ranging from basaltic rhyolitic compositions are debated. Differentiation currently discussed include magma mixing, assimilation, crustal melting, (fractional) crystallisation. In this contribution, differentiation by decom...

The 56 ka Monte Epomeo Green Tuff (MEGT) resulted from the largest volume explosive eruption Ischia island (south Italy). Its tephra is one of main stratigraphic markers central Mediterranean area. Despite its importance, a detailed characterisation petrography and mineral chemistry MEGT lacking. To fill this gap, we present petrographic description electron microprobe data on samples collected...