Abstract
The strong dependence of vanadium partitioning between olivine and silicate melt
(
We suggest that this equation can be used as an oxybarometer, which is particularly well applicable to the hydrous island-arc magmas at relatively low temperature. Application of the equation to the composition of melt inclusions and their host olivine phenocrysts from basalts of Mutnovsky volcano, containing vanadium concentrations in the range of 250–370 and 4–6 ppm, respectively, reveals an oxygen fugacity in the range ΔQFM +1.9 to +2.3. The estimates are in a good agreement with olivine-spinel oxybarometry for Mutnovsky basalts and may be typical for moderately evolved island-arc magmas.
Acknowledgments
This research has been supported by the Russian Foundation for Basic Research (project no. 16-35-60123), the Russian Science Foundation (grant 14-17-000582) and the German Science Foundation (DFG projects Ho1337/21, Ho1337/19, and Bo2941/3-1). We thank C. Godeck for the help with performing the experiments, U. Westernströer for help with the LA-ICP-MS at CAU Kiel, I. Horn for help with the LA-ICP-MS at LU Hannover. Also we thank M. Brounce and an anonymous reviewer whose critical comments helped to improve the original manuscript. The editorial work of S. Straub is greatly appreciated.
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