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• W4210256957 abstract "Abstract Melt Fe 3+ /Fe T ratios are widely used as a proxy for the oxygen fugacity ( f O 2 ) in magma systems. A particular challenge is a difficulty in quantifying the Fe 2+ and Fe 3+ contents, which are not easily measurable by conventional techniques. Using the Mn–Fe 2+ exchange coefficient (KD) between olivine (ol) and melt (m), this study develops a novel approach to this problem using the relationship of / = 1 − * ( /Mn ol )/( /Mn m ). The key for applying this equation is to combine well‐defined with accurate Mn and Fe T analyses of olivine and coexisting melt. The Mn and Fe T analyses are readily measured by electron microprobe. To define , we performed experiments at 1.0–1.75 GPa and 1250–1450°C under graphite‐buffered conditions, where Fe T can be used as Fe 2+ to calculate . The results show that = 0.730 ± 0.025 is nearly constant over a realistic range of experimental conditions (temperature, pressure, and melt composition) relevant to basaltic magmas, allowing calculation of melt Fe 3+ /Fe T ratios without the need for any further knowledge of these parameters. A comparison with published data, where melt Fe 3+ /Fe T ratios have been directly measured, demonstrates that our calculation method is as accurate as Mossbauer spectroscopy and XANES techniques, thus providing a very simple and accessible approach to melt Fe 3+ /Fe T ratio estimation. However, it should be noted that the accuracy of this method is critically reliant on: (a) accurate Mn and Fe analyses and (b) olivine‐melt chemical equilibrium." @default.
• W4210256957 created "2022-02-08" @default.
• W4210256957 creator A5004610032 @default.
• W4210256957 creator A5040843536 @default.
• W4210256957 date "2022-02-01" @default.
• W4210256957 modified "2023-09-27" @default.
• W4210256957 title "A New Oxybarometer for Basalts Based on Olivine‐Melt Mn‐Fe ²⁺ Exchange Coefficient and Fe ^T /Mn Ratios in Olivine and Melt" @default.
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• W4210256957 doi "https://doi.org/10.1029/2021jb023312" @default.
• W4210256957 hasPublicationYear "2022" @default.
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