Journal Title
Title of Journal: Bull Volcanol
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Abbravation: Bulletin of Volcanology
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Publisher
Springer Berlin Heidelberg
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Authors: Shingo Takeuchi
Publish Date: 2015/04/24
Volume: 77, Issue: 5, Pages: 41-
Abstract
A simplified method to estimate preeruptive melt viscosity by using only melt SiO2 content groundmass SiO2 content is proposed for subalkaline magmas Melt viscosity is controlled by many magmatic properties eg melt composition melt water content and temperature however these properties are linked by phase equilibrium in preeruptive magmas In this study the magmatic properties were investigated by compiling data of phase equilibria experiments performed under preeruptive conditions Negative correlations are found between melt SiO2 contents and liquidus temperatures and between liquidus temperatures and melt water contents Both increasing melt SiO2 content and decreasing liquidus temperature have the effect of increasing the melt viscosity producing a linear positive correlation between logarithmic values of melt viscosity and linear values of melt SiO2 content For a specific melt SiO2 content an increase in liquidus temperature causes a decrease in melt viscosity whereas a decrease in water content causes an increase in melt viscosity As a result of this opposing effect the melt viscosity is strongly correlated with the melt SiO2 content the correlation coefficient of ∼1 Based on this relationship an empirical equation predicting logarithmic values of preeruptive melt viscosity is proposed as a linear function of melt SiO2 content referred to as the melt viscosity scale The equation reproduces melt viscosities for compiled experimental melts and natural melts with rootmeansquare deviation of ∼04 and ∼05 log units respectively This method provides orderofmagnitude estimates for preeruptive melt viscosity Its strength is in being applicable to examples for which a full dataset of preeruptive magmatic properties is lacking or has large uncertainties eg slowly cooled lavas The simplicity of this method enables us to easily and promptly estimate preeruptive melt viscosity Combined with rheological models for multiphase magmas the present method can be applied widely and thus greatly increase the number of case studies which include evidencebased estimates of preeruptive magma viscosityI would like to thank Akihiko Tomiya for his helpful comments on early manuscript and Kelly Russell KaiUwe Hess and the anonymous reviewer for their critical comments that helped to improve this paper I also thank the Associate Editor James E Gardner and the Executive Editor James DL White for their editorial handling and valuable comments
Keywords:
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- Geological constraints on the emplacement mechanism of the Parinacota debris avalanche, northern Chile
- Diverse mid-Miocene silicic volcanism associated with the Yellowstone–Newberry thermal anomaly
- Smithsonian Institution’s Global Volcanism Network
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