EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Estimating the viscosity of volcanic and binary melts from the vibrational properties of their parental glasses

Michele Cassetta1, Danilo Di Genova2, Marco Zanatta3, Tiziana Boffa Ballaran2, Alexander Kurnosov2, Marco Giarola4, Mattia Biesuz5, Gian Domenico Sorarù5, Beatrice Giannetta6, Claudio Zaccone6, Nicola Daldosso1, and Gino Mariotto1
Michele Cassetta et al.
  • 1University of Verona, Dept. Of Computer Science, Verona, Italy (
  • 2University of Bayreuth, BGI, Bayreuth, Germany
  • 3University of Trento, Dept. Of Physics, Trento-Povo, Italy
  • 4University of Verona, CPT, Verona, Italy
  • 5University of Trento, Dept. Of Industrial Engineering, Trento-Povo, Italy
  • 6University of Verona, Dept. Of Biotechnology, Verona, Italy

The knowledge of the viscosity of magmas as a function of melt composition and temperature is central in the numerical modeling of the magmatic dynamics and eruptive scenarios. Recent studies suggest that the measure of the viscosity of volcanic melts is affected by the occurrence of nano-scale modification (i.e., crystallization) of the melt structure during the measurement. This challenges the possibility of being able to quantify the crystal-free melt phase contribution to the measured viscosity. Herein we provide a new strategy that allows an accurate estimation of the melt viscosity at eruptive conditions starting from the Brillouin and Raman scattering of parental glasses. Our results show that the ratio between bulk and shear moduli and the boson peak position of glass embed the melt fragility. However, at the moment there are no known reasons why some of these quantities are linked together in such multicomponent systems. At this effort, we also provided a mean to evaluate whether the local structure of glasses may justify this correlation by testing the well-known prototypical binary system Na2O-SiO2. Concluding, our strategy allows the estimation of the melt viscosity as a function of temperature avoiding its direct measurement, ridding also the measurement from unwished crystallization.

How to cite: Cassetta, M., Di Genova, D., Zanatta, M., Boffa Ballaran, T., Kurnosov, A., Giarola, M., Biesuz, M., Sorarù, G. D., Giannetta, B., Zaccone, C., Daldosso, N., and Mariotto, G.: Estimating the viscosity of volcanic and binary melts from the vibrational properties of their parental glasses, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-559,, 2022.