Fig. 2: Effects of oxygen fugacity on the distribution and abundances of V in eclogite minerals. | Nature Communications

Fig. 2: Effects of oxygen fugacity on the distribution and abundances of V in eclogite minerals.

From: Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite

Fig. 2

a Distribution D of V between clinopyroxene (cpx) and garnet (gt) in eclogite xenoliths as a function of oxygen fugacity relative to the Fayalite-Magnetite-Quartz buffer (∆logƒO2(FMQ); available for xenoliths only); oran-orangeite-hosted, kimb-kimberlite-hosted. Superposed is the distribution of V between clinopyroxene and rutile (rut) as a function of ƒO2 (yellow crosses), as calculated from the parameterisation of experimentally determined mineral-melt partition coefficients12,26. Vanadium concentration (ppm) in b clinopyroxene and c garnet as a function of ƒO2, with regressions and r2 (significant for the number n of observations; Table 2). Error bar in a shows representative average 1σ uncertainty of ƒO2 estimates of −1.0, +0.614; 1σ uncertainties on V abundances of 14.5 ppm for clinopyroxene and 5.6 ppm for garnet (corresponding to typical uncertainties for multiple analyses per sample reported in the literature, see Methods) are small relative to the depicted scale and not shown. Data sources in Supplementary Data 1.

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