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The stability of divalent Ge in silicate melts and its geochemical properties

Mare, Eleanor; O'Neill, Hugh; Berry, Andrew; Glover, Chris


The oxidation state of Ge in silicate glasses, quenched from melts, was determined by X-ray absorption spectroscopy. The melts were equilibrated over the range of relative oxygen fugacities (fO2) from IW -3 to IW +10, where IW is the iron-wüstite oxygen buffer in logarithmic units. X-ray absorption near edge structure (XANES) spectra of the samples show that over the range in fO2 from IW -2.8 to IW + 2.4, the Ge4+/(Ge2+ + Ge4+) ratio increases from 0.05 to 0.95. Modelling of extended X-ray...[Show more]

CollectionsANU Research Publications
Date published: 2020-01-20
Type: Journal article
Source: Chemical Geology
DOI: 10.1016/j.chemgeo.2019.119306


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