Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Oxygen Fugacity

  • Francis Albarede
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_4021-3

Definition

Oxygen fugacity is an equivalent of the partial pressure of oxygen in a particular environment (atmosphere, rocks, etc.) corrected for the nonideal character of the gas.

Overview

There are multiple ways of characterizing how reducing or how oxidizing an environment is. An example of a redox reaction in an ideal gas mixture of carbon dioxide, methane, water, and oxygen is:
$$ {\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O}\iff {\mathrm{O}}_2+{\mathrm{CH}}_4 $$

Keywords

Mineral redox buffer Redox reactions Redox zonations 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Ecole Normale Supérieure de LyonLyon Cedex 7France