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Contributions to Mineralogy and Petrology

, Volume 164, Issue 3, pp 397–406 | Cite as

Oxygen fugacity control in piston-cylinder experiments

  • Sigurdur Jakobsson
Original Paper

Abstract

The main goal of this study was to develop and test a capsule assembly for use in piston-cylinder experiments where oxygen fugacity could be controlled in the vicinity of the QFM buffer without H2O loss or carbon contamination of the sample material. The assembly consists of an outer Pt-capsule containing a solid buffer (Ni–NiO or Co–CoO) plus H2O and an inner AuPd-capsule, containing the sample, H2O and a Pt-wire. No H2O loss is observed from the sample, even after 48 h, but a slight increase in H2O content is found in longer runs due to oxygen and hydrogen diffusion into the AuPd-capsule. Oxygen fugacity of runs in equilibrium with the Ni–NiO (NNO) and Co–CoO (CoCO) buffers was measured by analyzing Fe dissolved in the Pt-wire and in the AuPd-capsule. The second method gives values that are in good agreement with established buffer values, whereas results from the first method are one half to one log units higher than the established values.

Keywords

Oxygen fugacity Experimental petrology Piston-cylinder Capsule-assemblies 

Notes

Acknowledgments

Thanks are due to Richard Hinton for ion probe analyses, Haraldur P. Gunnlaugsson for Mössbauer measurements, Karl Grönvold for microprobe assistance and Niels Oskarsson for many fruitful discussions during the course of this study. John R. Holloway and Sigurdur Steinthorsson read drafts of the manuscript and provided valuable comments. Gordon Moore is thanked for editorial handling, Tony Withers for a constructive review, and an anonymous reviewer is thanked for his review.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Institute of Earth SciencesUniversity of IcelandReykjavíkIceland

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