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Abstract <p>Experience in using our previous equation for the prediction of water solubility in silicate melt revealed that the calculated water contents for some experiments at pressures of 5–20 kbar are unrealistically high compared with the experimental measurements. The sample containing the results of 412 experiments used in the previous study was significantly expanded by adding experiments from the MELT database. Using the new total sample containing 1241 experiments, the set of variables describing the effect of melt composition on water solubility was revised. The newly calibrated equation predicts water solubility in silicate melts with an uncertainty of no higher than ±0.01 mole fraction or ±0.25 wt % at pressures from one atmosphere to 20 kbar and temperatures from 825 to 1550 K. The sample size used for the optimization allows the equation to be applied over a wide range of silicate melt composition from komatiitic basalt to rhyolite.</p>

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Recalibration of the Equation for Calculating Water Content in Silicate Melt Equilibrated with Aqueous Fluid

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Ya. Yu. Gnuchev,
  • D. A. Bychkov,
  • E. V. Koptev-Dvornikov

摘要

Abstract

Experience in using our previous equation for the prediction of water solubility in silicate melt revealed that the calculated water contents for some experiments at pressures of 5–20 kbar are unrealistically high compared with the experimental measurements. The sample containing the results of 412 experiments used in the previous study was significantly expanded by adding experiments from the MELT database. Using the new total sample containing 1241 experiments, the set of variables describing the effect of melt composition on water solubility was revised. The newly calibrated equation predicts water solubility in silicate melts with an uncertainty of no higher than ±0.01 mole fraction or ±0.25 wt % at pressures from one atmosphere to 20 kbar and temperatures from 825 to 1550 K. The sample size used for the optimization allows the equation to be applied over a wide range of silicate melt composition from komatiitic basalt to rhyolite.