| Numéro |
J. Phys. IV France
Volume 104, March 2003
|
|
|---|---|---|
| Page(s) | 393 - 397 | |
| DOI | https://doi.org/10.1051/jp4:20030107 | |
J. Phys. IV France 104 (2003) 393
DOI: 10.1051/jp4:20030107
X-ray microspectroscopy of sulfur in basaltic glass inclusions. Inference on the volcanic sulfur emissions
N. Métrich1, J. Susini2, L. Galoisy3, G. Calas3, M. Bonnin-Mosbah4 and B. Menez1, 51 Laboratoire Pierre Süe, CE-CNRS, Saclay, France
2 European Synchrotron Radiation Facility, Grenoble, France
3 Laboratoire de Minéralogie-Cristallographie de Paris, France
4 INSTN/CFR, CEA, Saclay, France
5 Laboratoire Géosciences Marines, IPG, Paris, France
Abstract
It is commonly accepted that sulfur is carried out as sulfide (S
) or/and sulfate (S
) by Earth mantlederived
melts, before being released as SO
2 and/or H
2S in volcanic emissions. By analyzing reference
compounds and a selection of minute glass inclusions in olivine crystals using
XANES (X-ray Near Edge
Structure) spectroscopy at the sulfur K-edge, we demonstrated the ubiquitous presence of sulfite (S
) in addition
to sulfate (S
) in these rare inclusions representative of oxidized and water rich-basaltic magmas, prior to loss of
sulfur and water. The sulfide (S
) when exists is minor. We proposed that sulfite (S
) acts as an intermediate,
metastable species which results in partitioning of sulfur into the volcanic gas emissions.
© EDP Sciences 2003