Experimental measurements of the viscosity and melt structure of alkali basalts at high pressure and temperature

Barbara Bonechi*, Vincenzo Stagno, Yoshio Kono, Rostislav Hrubiak, Luca Ziberna, Giovanni B. Andreozzi, Cristina Perinelli, Mario Gaeta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Volcanic eruptions are shallow phenomena that represent the final stage of density- and viscosity- driven processes of melt migration from source rocks at upper mantle depths. In this experimental study, we investigated the effect of pressure (0.7–7.0 GPa) and temperature (1335–2000 °C) on the viscosity and the atomic melt structure of a synthetic anhydrous primitive alkaline basalt, an analogue of the pre-eruptive magma that likely feeds the Campi Flegrei Volcanic District at present day. Obtained viscosities (0.5–3.0 Pa s), mobility (0.1–0.4 g cm3 Pa−1 s−1) and ascent velocity (1.5–6.0 m yr−1) are presented to support geochemical and geophysical observations of Campi Flegrei as a critical volcanic district currently undergoing gradual magma recharge at depth.

Original languageEnglish
Article number2599
JournalScientific Reports
Volume12
Issue number1
DOIs
Publication statusPublished - 16 Feb 2022

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