Abstract
The diffusion of water in natural obsidian and model dacitic melts (Ab90Di8Wo2, mol %) has been studied at water vapor pressure up to 170 MPa, temperatures of 1200°C, H2O contents in melts up to ∼6 wt % using a high gas pressure apparatus equipped with a unique internal device. The experiments were carried out by a new low-gradient technique with application of diffusion hydration of a melt from fluid phase. The water solubility in the melts and its concentration along \(C_{H_2 O} \) diffusion profiles were determined using IR microspectrometry by application of the modified Bouguer-Beer-Lambert equation. A structural-chemical model was proposed to calculate and predict the concentration dependence of molar absorption coefficients of the hydroxyl groups (OH−) and water molecules (H2O) in acid polymerized glasses (quenched melts) in the obsidian-dacite series. The water diffusion coefficients \(D_{H_2 O} \) were obtained by the mathematical analysis of concentration profiles and the analytical solution of the second Fick diffusion law using the Boltzman-Matano method. It was shown experimentally that \(D_{H_2 O} \) exponentially increases with a growth of water concentration in the obsidian and dacitic melts within the entire range of diffusion profiles. Based on the established quantitative correlation between \(D_{H_2 O} \) and viscosity of such melts, a new method was developed to predict and calculate the concentration, temperature, and pressure dependences of \(D_{H_2 O} \) in acid magmatic melts (obsidian, rhyolite, albite, granite, dacite) at crustal T, P parameters and water concentrations up to 6 wt %.
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References
Eduard S. Persikov, Sally Newman, Pavel G. Bukhtiyarov, Alexey N. Nekrasov, and Edward M. Stolper, “Experimental study of water diffusion in haplobasaltic and haploandesitic melts,” Chem. Geol. 276, 241–256 (2010).
A. S. Chekhmir and M. B. Epel’baum, “Diffusion in magmatic melts,” in Physical Chemistry of Magmas, Ed. by L.L. Perchuk and I. Kushiro, Adv. Phys. Geochem. 9 (Springer-Verlag, New York, 1991), pp. 99–195.
E. B. Watson, “Diffusion in volatile-bearing magmas,” Ed. by M.R. Carrol and J.R. Holloway, Rev. Mineral., 30, 371–411 (1994).
H. R. Shaw, “Diffusion of H2O in granitic liquids; Part I. Experimental data; Part II. Mass transfer in magma chambers,” in Geochemical Transport and Kinetics, Ed. by A. W. Hofmann et al., Carnegie Institute Washington Publ. 634, 139–170 (1974).
D. B. Delaney and J. L. Karsten, “Ion microprobe studies of water in silicate melts: concentration-dependent diffusion in obsidian,” Earth Planet. Sci. Lett. 52, 191–202 (1981).
K. E. Lapham, J. R. Holloway, and D. B. Delaney, “Diffusion of H2O in obsidian at elevated temperatures and pressures,” J. Non-Cryst. Solids 67, 179–191 (1984).
E. S. Persikov, V. A. Zharikov, P. G. Bukhtiyarov, and S. F. Pol’skoy, “The effect of volatiles on the properties of magmatic melts,” Eur. J. Mineral. 2, 621–642 (1990).
Y. Zhang and E. M. Stolper, “Water diffusion in a basaltic melt,” Nature 351, 306–309 (1991).
H. Behrens and M. Nowak, “The mechanisms of water diffusion in polymerized silicate melts,” Contrib. Mineral. Petrol. 126, 377–385. (1997).
M. Nowak and H. Behrens, “An experimental investigation on diffusion of water in haplogranitic melts,” Contrib. Mineral. Petrol. 126, 365–376 (1997).
R. H. Doremus, “Diffusion of water in rhyolite glass: diffusion-reaction model,” J. Non-Cryst. Solids 261, 101–107 (2000).
Y. Zhang and H. Behrens, “H2O diffusion in rhyolitic melts and glasses,” Chem. Geol. 169, 243–262 (2000).
Y. Zhang, “H2O in rhyolitic glasses and melts: measurement, speciation, solubility, and diffusion,” Rev. Geophys. 37, 493–516 (1999).
D. R. Baker, C. Freda, R. A. Drooker, and P. Scarlato, “Volatile diffusion in silicate melts and its effects on melt inclusions,” Ann. Geophys. 48(4–5), 699–717 (2005).
E. S. Persikov, P. G. Bukhtiyarov, and A. N. Nekrasov, “Water Diffusion in Basalt and Andesite Melts under High Pressures,” Geochem. Int. 48(3), 213–225 (2010).
H. Behrens, Y. Zhang, and Z. Xu, “H2O diffusion in dacitic and andesitic melts,” Geochim. Cosmochim. Acta. 68, 5139–5150 (2004).
C. Freda, D. R. Baker., C. Romano, and P. Scarlato, “Water diffusion in natural potassic melts,” in Volcanic Degassing, Ed. by C. Oppenheimer, D. M. Pyle, and J. Barclay, Geol. Soc. London Sp. Publ. 213, P. 52–62 (2003).
E. S. Persikov and P.G. Bukhtiyarov, “Interrelated structural chemical model to predict and calculate viscosity of magmatic melts and water diffusion in a wide range of compositions and T-P parameters of the Earth’s crust and upper mantle,” Russ. Geol. Geophys. 50(12), 1079–1090 (2009).
E. S. Persikov and P. G. Bukhtiyarov, “Unique gas high pressure apparatus to study fluid-melts and fluidsolid-melts interaction with any fluid composition at the temperature up to 1400°C and at the pressures up to 5 kbars,” J. Conf. Abs. 7(1), 85 (2002).
E. S. Persikov, “The viscosity of magmatic liquids: experiment, generalized patterns. A model for calculation and prediction. Applications,” in Physical Chemistry of Magmas, Ed. by L. L. Perchuk and I. Kushiro, Adv. Phys. Geochem. 9 (Springer-Verlag, New York, 1991), pp. 1–40.
E. S. Persikov and P. G. Bukhtiyarov, “Experimental study of the influence of lithostatic and water pressure on the viscosity of silicate and magmatic melts. New structural-chemical model of calculation and prediction of their viscosity,” in Experimental Mineralogy: Some results on the Turn of Century, Ed. by V.A. Zharikov and V.V. Fed’kin (Nauka, Moscow, 2004), Vol. 1, pp. 103–122 [in Russian].
E. S. Persikov, “Viscosity of model and magmatic melts at crustal and upper mantle T, P parameters,” Geol. Geofiz. 39(12), 1798–1804 (1998).
E. M. Stolper, “Water in silicate glasses: an infrared spectroscopic study,” Contrib. Mineral. Petrol. 81, 1–17 (1982).
S. Ohlhorst, H. Behrens, and F. Holtz, “Compositional dependence of molar absorptivities of near-infrared OH- and H2O bands in rhyolitic to basaltic glasses,” Chem. Geol. 174, 5–20 (2001).
J. E. Dixon, E. M. Stolper, and J. R. Holloway, “An experimental study of water and carbon dioxide solubilities in mid-ocean ridge basaltic liquids. Part I: calibration and solubility model,” J. Petrol. 36, 1607–1631 (1995).
C. W. Mandeville, J. D. Webster, M. J. Rutherford, B. E. Taylor, A. Timban, and K. Faure, “Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses,” Am. Mineral. 87, 813–821 (2002).
J. Crank, The Mathematics of Diffusion (Clarendon Press, Oxford, 1975).
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Original Russian Text © E.S. Persikov, P.G. Bukhtiyarov, A.N. Nekrasov, G.V. Bondarenko, 2014, published in Geokhimiya, 2014, No. 5, pp. 406–413.
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Persikov, E.S., Bukhtiyarov, P.G., Nekrasov, A.N. et al. Concentration dependence of water diffusion in obsidian and dacitic melts at high-pressures. Geochem. Int. 52, 365–371 (2014). https://doi.org/10.1134/S0016702914050085
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DOI: https://doi.org/10.1134/S0016702914050085