Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-07
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S1: Igneous processes and fluids
The effect of sulfur degassing on oxygen fugacity of basaltic melt; a preliminary result using equilibrium batch degassing model
*Hidemi ISHIBASHI
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Abstract

The effect of sulfur degassing on fO2 condition of the petit-spot site-B basaltic melt is numerically examined assuming equilibrium batch degassing. The results indicate that the effect of S degassing on fO2 of melt depends on initial fO2 condition of melt. At fO2 ~ QMF+0.7, sulfur degassing does not influence on melt fO2 condition. For melt more/less oxidized than QMF+0.7, melt fO2 increases/decreases as S degasses. By considering < 2000 ppm of sulfur degassing, initial fO2 condition of petit spot melt is estimated to be > QMF+1.4, indicating arc-like fO2 condition of petit-spot mantle.

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© 2015 Japan Association of Mineralogical Sciences
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