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American Mineralogist; February 2004; v. 89; no. 2-3; p. 277-284
© 2004 Mineralogical Society of America
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The speciation of dissolved H2O in dacitic melt

Yang Liu1,*, Harald Behrens2 and Youxue Zhang1

1 Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
2 Institut für Mineralogie, Universität Hannover, Callinstrasse 3, D-30167 Hannover, Germany

We report the first systematic study of H2O speciation in dacitic melt with total dissolved H2O ranging from 1.4 to 2.6 wt%. Samples were heated in a one-atmosphere tube furnace at 480–590 °C for certain durations and then quenched in water or air. Species concentrations were measured with Fourier transform infrared (FTIR) spectroscopy. At a given temperature, the equilibrium constant for the reaction, H2Om (melt) + O (melt) = 2OH (melt), is roughly constant. At the same temperature and water content, the equilibrium constant for the hydrous species interconversion reaction in dacitic melt appears to be slightly greater than in hydrous rhyolitic melt, reflecting a larger proportion of dissolved H2O as hydroxyl groups in dacitic melt. Our results can be applied to model species equilibrium in hydrous dacitic melt, to estimate the apparent equilibrium temperature of natural dacitic glasses, and to investigate viscosity of hydrous dacitic melts.




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M. Zhang, E. K.H. Salje, M. A. Carpenter, J. Y. Wang, L. A. Groat, G. A. Lager, L. Wang, A. Beran, and U. Bismayer
Temperature dependence of IR absorption of hydrous/hydroxyl species in minerals and synthetic materials
American Mineralogist, August 1, 2007; 92(8-9): 1502 - 1517.
[Abstract] [Full Text] [PDF]


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