potential oxygen fugacity (IMAGE) Chinese Academy of Sciences Headquarters Caption Researchers proposed a “potential oxygen fugacity” parameter to directly compare the fO2 characteristics of melts formed at different depths. Credit Image by IOCAS Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.