Solubility of sulfur in some magmas at 1 atmosphere

Details Solubility of sulfur in some magmas at 1 atmosphere Solubility of sulfur in some magmas at 1 atmosphere

Apr 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..517k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 4, pp.517-531

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Scientific paper

In order to understand the distribution of sulfur in igneous rooks, we determined the solubility of sulfur in volcanic rock melts (tholeiite basalt, hawaiite and rhyodacite from Hawaii) at various gas compositions and at 1250° and 1300°C and 1 atm total pressure. The solubility of sulfur in the melt passes through a minimum with change in oxygen partial pressure, if other factors are held constant. For the basaltic liquid at 1200°C, most sulfur in the melt is as dissolved sulfide (S -2 ) at oxygen partial pressures below 10 -8 atm and as dissolved sulfate at oxygen partial pressures above 10 -8 atm. Based on the present solubility data, 5 per cent is inferred for volcanic gas at 1 atm total pressure in equilibrium with subaerially extruded Hawaiian tholeiite basalt (Pele's hair with 180 ppm S) at 1200°C and 10 -8 atm P O 2 .

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