Viscosity of Magmas
A special issue of Minerals (ISSN 2075-163X).
Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 2034
Special Issue Editors
Interests: viscosity; magma rheology; experimental petrology; decarbonation processes; liquid line of descent of magmas
Special Issue Information
Dear Colleagues,
Viscosity is a key factor governing both intrusive and volcanic processes. The most important parameters affecting the viscosity of silicate melts are melt composition and temperature. Pressure has only a minor effect at crustal depths, whereas crystals and bubbles have a dramatic influence. Among compositional parameters, the volatile content (mainly H2O) is critical because it affects the rheological behavior of melts and thus eruptive styles. Consequently, an appropriate knowledge of magma viscosity as a function of dissolved volatiles is mandatory to obtain reliable models of volcanic processes (i.e., magma ascent, fragmentation, and dispersion), which in turn is required to predict realistic volcanic scenarios and forecast volcanic hazards. Moreover, any liquid can form a glass if cooled fast enough. However, two different liquids cooled at the same rate can react differently in terms of crystallization and/or vitrification (i.e., a liquid is a “good glass former”, another one is a “poor glass former” being more prone to quickly nucleate). Thus, it is extremely important to know the relationship between liquid composition and nucleation kinetics. Thus, the study of viscosity also in presence of crystals, beyond volatiles, is fundamental to have a clear knowledge of the processes governing magma ascent during an eruption.
Dr. Valeria Misiti
Dr. Francesco Vetere
Guest Editors
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Keywords
- viscosity
- silicate melt
- rheology
- experimental study
- cooling kinetics
- nucleation
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