Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4151m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 21, pp.4151-4160
Physics
32
Scientific paper
The sulfur concentrations and the relative proportions of S 2- and S 6+ were measured by electron microprobe in a series of melt inclusions trapped in phenocrysts from different subduction-related and within-plate volcanoes. The melt inclusions correspond to potassic and shoshonitic primary melts to tholeiitic and hawaiitic primitive melts. In the tholeiitic and the transitional basaltic melt inclusions, sulfur is mainly present as S 2- (S 6+ /S total = 0.03 to 0.08), and varies from 0.13 to 0.18 wt%. The occurrence of immiscible sulfides attests to their saturation. In shoshonitic and potassic primary melts, sulfur (S = 0.12 to 0.32 wt%) is dissolved as both S 2- and S 6+ (S 6+ /S total = 0.3 to 0.7). Their oxygen fugacity, estimated from the S 6+ /S total ratios, ranges from NiNiO to NiNiO + 1 log unit. Hawaiitic melts may also dissolve up to 0.3 wt% sulfur possibly because of their oxidation state close to NiNiO, as illustrated by samples from Mt. Etna, Italy. Variations of sulfur, at constant S 6+ /S total ratio and temperature in both the potassic and shoshonitic primary melts, indicate that these melts are undersaturated, with respect to a S-rich condensed phase, in agreement with their relatively high oxidation state. It strongly suggests that sulfur behavior in relatively oxidized primary alkaline melts is controlled by the mantle source melting conditions.
Clocchiatti Robert
Métrich Nicole
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