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

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.

SUBMITTER: Bonechi B

PROVIDER: S-EPMC8850584 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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

Bonechi Barbara B Stagno Vincenzo V Kono Yoshio Y Hrubiak Rostislav R Ziberna Luca L Andreozzi Giovanni B GB Perinelli Cristina C Gaeta Mario M

Scientific reports 20220216 1

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. Obtai ...[more]

PMID: 35173251

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