Year: 2024
Type: article
Abstract: The speciation of iodine in basalts has been investigated by combining in situ X-ray diffraction at high pressures and temperatures up to 4.9 GPa and 1600 °C, and Raman spectroscopy on recovered high pressure glasses at ambient conditions. Both methods point to iodine being oxidized in basalts, whether molten or quenched as glasses. Observed interatomic distances and Raman vibrational modes are consistent with iodine being dissolved as complex iodate groups alike polyiodates or periodates, not as IO 3 - groups. Iodine speciation in basalts therefore seems to reflect a trend amongst halogens, with lighter chlorine bonding to network modifying cations, and bromine changing affinity from network modifying cations to oxygen anions under pressure. In the absence of a fluid aqueous phase, iodine could thus reach the Earth’s surface in basaltic magmas as an oxide, not as a reduced species.
Source: Comptes Rendus Géoscience
DOI: 10.5802/crgeos.279
Institutions: Centre National de la Recherche Scientifique, Institut Universitaire de France, Sorbonne Université, Institut de minéralogie, de physique des matériaux et de cosmochimie, Goethe University Frankfurt, University of Illinois Urbana-Champaign, Kwansei Gakuin University, Argonne National Laboratory
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: diamond
Awards: G102163711, G107546177, Magmas at Depth: an Experimental Study at Extreme Conditions, G1313983767, G1664757510, G2287611682, G262962599, G3075337988, G3318903820, Volcanic Halogens: from Deep Earth to Atmospheric Impacts, G4656594441, G498139845, G6092972593, G6848031779, G6918803902, Comprehensive study of anomalous behaviors of viscosity, elasticity, and density of silicate magmas under pressure, G8389335838, G969889393, G993149817
OpenAlex ID: W4405322864