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Licensed Unlicensed Requires Authentication Published by De Gruyter March 28, 2015

The speciation of dissolved H2O in dacitic melt

  • Yang Liu EMAIL logo , Harald Behrens and Youxue Zhang
From the journal American Mineralogist

Abstract

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.

Received: 2003-2-4
Accepted: 2003-9-29
Published Online: 2015-3-28
Published in Print: 2004-2-1

© 2015 by Walter de Gruyter Berlin/Boston

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