Abstract
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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References
Behrens H, Schmidt MO (1998) Infrared spectroscopy of hydrous silicic glasses at temperature up to 600°C and implication for the incorporation and dynamics of water in the glasses. Neues Jahrbuch der Mineralogie Abhandlungen 172:203–226
Dingwell DB, Romano C, Hess KU (1996) The effect of water on the viscosity of a haplogranitic melt under P-T-X conditions relevant to silicic volcanism. Contrib Miner Petrol 124:19–28
Dingwell DB, Hess KU, Romano C (1998a) Viscosity data for hydrous peraluminous granitic melts: comparison with a metaluminous model. Am Miner 83:236–239
Dingwell DB, Hess KU, Romano C (1998b) Extremely fluid behavior of hydrous peralkaline rhyolites. Earth Planet Sci Lett 158:31–38
Dobson PF, Epstein S, Stolper EM (1989) Hydrogen isotope fractionation between coexisting vapor and silicate glasses and melts at low pressure. Geochim Cosmochim Acta 53:2723–2730
Giordano D, Dingwell DB, Romano C (2000) Viscosity of a Teide phonolite in the welding interval. J Volcanol Geotherm Res 103:239–245
Giordano D, Dingwell DB (2003) Viscosity of hydrous Etna basalt: implications for Plinian-style basaltic eruptions. Bull Volcanol 65:8–14
Hess KU, Dingwell DB (1996) Viscosities of hydrous leucogranitic melts: a non-Arrhenian model. Am Miner 81:1297–1300
Ihnger PD, Hervig RL, McMillan PF (1994) Analytical methods for volatiles in glasses. Rev Miner 30:67–121
Newman S, Stolper EM, Epstein S (1986) Measurement of water in rhyolitic glasses: calibration of an infrared spectroscopic technique. Am Miner 71:1527–1541
Ohlhorst S, Behrens H, Holtz F (2001) Compositional dependence of molar absorptivities of near-infrared OH-and H2O bands in rhyolitic to basaltic glasses. Chem Geol 174: 5–20
Richet P, Lejeune AM, Holts F, Roux J (1996) Water and the viscosity of andesite melts. Chem Geol 128:185–197
Rust AC, Manga M, Cashman KV (2003) Determining flow type, shear rate and shear stress in magmas from bubble shapes and orientations. J Volcanol Geotherm Res 122:111–132
Shaw HR (1972) Viscosities of magmatic silicate liquids: an empirical method of prediction. Am J Sci 272:870–893
Stolper E (1982) Water in silicate glasses: an infrared spectroscopic study. Contrib Miner Petrol 81:1–17
Stevensen RJ, Bagdassarov NS, Dingwell DB (1998) The influence of trace amount of water on the viscosity of rhyolites. Bull Volcanol 60:89–97
Tamic N, Behrens H, Holts F (2001) The solubility of H2O and CO2 in rhyolitic melts in equilibrium with a mixed CO2-H2O fluid phase. Chem Geol 174:333–347
Taniguchi H (1992) Entropy dependence of viscosity and the glass-transition temperature of melts in the system diopside- anorthite. Contrib Miner Petrol 109:295–303
Webb SL, Dingwell DB (1990) Non-Newtonian rheology of igneous melts at high stresses and strain rates: experimental results for rhyolite, andesite, basalt and nepheline. J Geophys Res 95:15695–15701
Whittington A, Richet P, Linard Y, Holts F (2001) The viscosity of hydrous phonolites and trachytes. Chem Geol 174:209–223
Withers AC, Behrens H (1999) Temperature-induced changes in the NIR spectra of hydrous albitic and rhyolitic glasses between 300 and 100 K. Phys Chem Miner 27:119–132
Yanagisawa N, Fujimoto K, Nakashima S, Kurita Y, Sanada N (1997) Micro FT-IR study of the hydration-layer during dissolution of silica glass. Geochim Cosmochim Acta 61:1165–1170
Acknowledgments
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
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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
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DOI: https://doi.org/10.1007/s00445-004-0401-7