The W-WO2 oxygen fugacity buffer (WWO) at high pressure and temperature: Implications for fO2 buffering and metal-silicate partitioning

Gregory A. Shofner; Andrew J. Campbell; Lisa R. Danielson; Kevin Righter; Rebecca A. Fischer; Yanbin Wang; Vitali Prakapenka

doi:10.2138/am-2016-5328

Published by De Gruyter January 9, 2016

The W-WO₂ oxygen fugacity buffer (WWO) at high pressure and temperature: Implications for f_O₂ buffering and metal-silicate partitioning

Gregory A. Shofner , Andrew J. Campbell , Lisa R. Danielson , Kevin Righter , Rebecca A. Fischer , Yanbin Wang and Vitali Prakapenka

From the journal American Mineralogist

https://doi.org/10.2138/am-2016-5328

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Abstract

Synchrotron X-ray diffraction data were obtained to simultaneously measure unit-cell volumes of W and WO₂ at pressures and temperatures up to 70 GPa and 2300 K. Both W and WO₂ unit-cell volume data were fit to Mie-Grüneisen equations of state; parameters for W are K_T = 307 (±0.4) GPa, KT′ = 4.05(±0.04), γ₀ = 1.61 (±0.03), and q = 1.54 (±0.13). Three phases were observed in WO₂ with structures in the P2₁/c, Pnma, and C2/c space groups. The transition pressures are 4 and 32 GPa for the P2₁/c-Pnma and Pnma-C2/c phase changes, respectively. The P2₁/c and Pnma phases have previously been described, whereas the C2/c phase is newly described here. Equations of state were fitted for these phases over their respective pressure ranges yielding the parameters K_T = 238 (±7), 230 (±5), 304 (±3) GPa, KT′ = 4, 4 (fixed), 4 (fixed) GPa, γ₀ = 1.45 (±0.18), 1.22 (±0.07), 1.21 (±0.12), and q = 1 (fixed), 2.90 (±1.5), 1 (fixed) for the P2₁/c, Pnma, and C2/c phases, respectively. The W-WO₂ buffer (WWO) was extended to high pressure using these W and WO₂ equations of state. The T-f_O₂ slope of the WWO buffer along isobars is positive from 1000 to 2500 K with increasing pressure up to at least 60 GPa. The WWO buffer is at a higher f_O₂ than the iron-wüstite (IW) buffer at pressures lower than 40 GPa, and the magnitude of this difference decreases at higher pressures. This implies an increasingly lithophile character for W at higher pressures. The WWO buffer was quantitatively applied to W metal-silicate partitioning by using the WWO-IW buffer difference in combination with literature data on W metal-silicate partitioning to model the exchange coefficient (K_D) for the Fe-W exchange reaction. This approach captures the non-linear pressure dependence of W metal-silicate partitioning using the WWO-IW buffer difference. Calculation of K_D along a peridotite liquidus predicts a decrease in W siderophility at higher pressures that supports the qualitative behavior predicted by the WWO-IW buffer difference, and agrees with findings of others. Comparing the competing effects of temperature and pressure the results here indicate that pressure exerts a greater effect on W metal-silicate partitioning.

Keywords: High pressure; tungsten; oxygen fugacity buffer; equation of state; metal-silicate partitioning

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Acknowledgments

This research was supported by a NASA GSRP fellowship to G.A.S., NASA RTOP from the Cosmochemistry program to K.R., and NSF grant EAR-1243847 to A.J.C. R.A.F. was supported by the NSF GSFP and a Flagship Fellowship from University of Maryland. high-pressure multi-anvil assemblies were produced by the COMPRES Infrastructure Development Project. Portions of this work were performed at GeoSoilEnviroCARS (Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation, Earth Sciences (EAR-1128799) and Department of Energy-GeoSciences (DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Assistance with RHDAC experiments was provided by undergraduate researcher James Deane. Reviews by D. Walker, C. Lesher, and several anonymous reviewers helped improve the clarity of the manuscript.

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Manuscript handled by Tracy Rushmer.

Received: 2015-2-13

Accepted: 2015-7-22

Published Online: 2016-1-9

Published in Print: 2016-1-1

The W-WO₂ oxygen fugacity buffer (WWO) at high pressure and temperature: Implications for f_O₂ buffering and metal-silicate partitioning

Abstract

Acknowledgments

References cited

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