Experimental calbration and implications of olivine-melt vanadium oxybarometry for hydrous magmas from Mutnovsky volcano (Kamchatka)

• Main Authors: Shishkina, T., Portnyagin, Maxim, Botcharnikov, R., Almeev, R., Holtz, F.
• Format: Conference Object
• Language: English
• Published: 2016
• Subjects: Kamchatka
• Online Access: https://oceanrep.geomar.de/id/eprint/34591/; https://oceanrep.geomar.de/id/eprint/34591/1/2016_Shishkina-EMC2016-Abstract.pdf

A promising method for the quantification of the redox conditions (oxygen fugacity, fO2) in basaltic systems, which might be applied to quenched melt inclusions in olivine, exploits the partitioning of vanadium between olivine and coexisting silicate melt (DV Ol‐M). Strong correlation of DV Ol‐M with fO2 was investigated in a number of experimental works on dry mafic and ultramafic melts in a wide range of fO2 conditions at pressures of 1 atm and 0.5–2 GPa, temperature range of 1150–1530°C (e.g., Canil&Fedortchouk, 2001; Mallmann&O’Neill, 2009; 2013). Only a few melt compositions equilibrated with olivine at T≤1250°C were studied so far. Although it was shown that melt composition, pressure and temperature have small effect on DV Ol‐M, more data are required to extend the calibration of the V oxybarometry to hydrous low‐temperature basalts representing island arc magmas.