Presence of sulfite (SIV) in arc magmas: Implications for volcanic sulfur emissions

Details Presence of sulfite (SIV) in arc magmas: Implications for volcanic sulfur emissions Presence of sulfite (SIV) in arc magmas: Implications for volcanic sulfur emissions

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..33m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 11, pp. 33-1, CiteID 1538, DOI 10.1029/2001GL014607

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Atmospheric Composition And Structure: Pressure, Density, And Temperature, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

The outstanding production of sulfur dioxide at arc volcanoes is not satisfactorily explained by most of the geochemical models involving the magmatic redox conditions. It is commonly accepted that sulfur is transported mainly as sulfide (SII-) and/or sulfate (SVI) by mantle-derived melts, before being released as SO2 and/or H2S in volcanic emissions. We present the first experimental evidence that other S-species coexist in water-rich arc basalts, by using X-ray microspectroscopy of olivine-hosted melt inclusions. In particular, we propose a new model involving sulfite (SIV) as the intermediate species dissolved in basaltic melts which results in highly efficient partitioning of sulfur into volcanic gas emissions at the origin of excess sulphur degassing observed at arc basaltic volcanoes.

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