Abstract. Using the diffusion couple technique, of CO2 in a leucititic melt from Colli Albani Volcanic District Italy was investigated at temperatures between 1200 and 1350 ∘C an internally heated pressure vessel 300 MPa. To examine effect dissolved H2O melt, experiments were performed for nominally dry (0.18 ± 0.03 wt % H2O) hydrous containing 3.36 0.28 H2O. Diffusion run 40 to 120 min termina...

The central Taupo Volcanic Zone (TVZ) in New Zealand, the most productive of silicic volcanic centres, is flanked by younger andesitic stratovolcanoes to south. Small basaltic scoria cones occur along length TVZ, primitive which contain abundant xenocrysts, giving insight into mantle feeding TVZ. Here, we present major and minor element compositions olivine from eleven mafic eruptions spanning ...

The youngest (last 1500 years) volcanic eruptions of Lipari, within the Aeolian Archipelago, produced prominent pumice cone Monte Pilato and obsidian lava flows Rocche Rosse Forgia Vecchia, concentrated in north-eastern sector island as well highly dispersed white-coloured, fine-grained tephra layers rhyolitic composition terrestrial marine settings on regional scale. Here we describe detail st...

The Harachiyama Formation comprises Lower Cretaceous volcanic rocks, which are distributed in the eastern margin of Kitakami Mountains northeastern Japan. Whole-rock chemical analysis, U–Pb zircon dating and Hf isotope analysis were performed to constrain formation age magmatic origin was discussed. lava tuff samples from Omoto Tsukue areas supported island-arc rhyolitic rocks (SiO2 content > 7...

In order to resolve the controversy over how to interpret experimental H2O speciation results using in-situ and quenching techniques, we have carried out an infrared spectroscopic study to determine whether the molecular H2O (5230 cm ) and OH (4520 cm ) band intensity variation with measurement temperature below glass transition is owing to species interconversion or to the temperature dependen...

The Main Ethiopian Rift (MER) is renowned as a focus of investigations into human origins. It also the site many large volcanic calderas, whose eruptions have spanned timeframe speciation, cultural innovation, and dispersal our species. Yet, despite their significance for dating fossils materials, timing geochemical signatures some largest remained poorly constrained at best. Here, through prog...