Hi, Are there any igneous types out there who can help? I am using the TRACE3 modelling program and I'm not sure what kind of oxygen fugacities would be suitable for a rhyolite system. Many thanks, Pat __________________ Pat Thompson Geology Department University of Leicester University Rd Leicester LE1 7RH UK Work Tel: +44 (0)116 252 3638 Home Tel: +44 (0)116 254 4918 email: [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%