We have devised a new, simple and easy technique to measure the viscosity of hydrous silicate melts by combining an autoclave for melt hydration and the fiber elongation method for viscosity measurement. Using this, we measured the viscosity of hydrous rhyolitic melts whose water content ranges from 0.02 to 0.58 wt%. We observed a drastic decrease in viscosity against water content: 0.1 wt% water decreases the viscosity about an order of magnitude. Even when the water content is only 0.02 wt%, the viscosity decreased about half an order of magnitude. These results clearly demonstrate that the effect of water on viscosity should not be ignored even when it occurs as a trace constituent. We compared our experimental data with those derived from a non-Arrhenian viscosity model, which is considered to be applicable to calc-alkaline samples. This model succeeded in expressing the viscosity variation against water content but was unable to accurately predict the measured viscosity of liquids.
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We are grateful to Y. Kudoh, E. Ohtani, T. Kondo, T. Nagase, T, Kubo and T. Kuribayashi for help with FT-IR analysis. Discussions with N. Yanagisawa, H. Isobe and S. Okumura were helpful for the hydration experiments. English corrections and comments by S. G. Catane are greatly appreciated. Critical reviews by P. Richet and an anonymous reviewer improved our manuscript substantially. Editorial handling by D. B. Dingwell is gratefully acknowledged. This work was supported by a Grant-in-Aid for Encouragement of Young Scientists from the Japan Society for the Promotion of Science
Editorial responsibility: D. Dingwell
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Goto, A., Taniguchi, H. & Kitakaze, A. Viscosity measurements of hydrous rhyolitic melts using the fiber elongation method. Bull Volcanol 67, 590–596 (2005). https://doi.org/10.1007/s00445-004-0401-7
- Silicate melts
- Fiber elongation method