J. Phys. IV France 7 (1997) C2-1029-C2-1030
Microbeam XAFS Studies on Fluid Inclusions at High TemperaturesR.A. Mayanovic1, A.J. Anderson2 and S. Bajt3
1 Department of Physics and Astronomy, Southwest Missouri State University, Springfield, MO 65804, U.S.A.
2 Department of Geology, St. Francis Xavier University, Antigonish, Nova Scotia, B2G ICO, Canada
3 Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
Zn and Fe K-edge microbeam XAFS measurements have been made on individual fluid inclusions in quartz at temperatures ranging from 25 °C to 500 °C. Analysis of Zn K-edge XAFS spectra shows that the ZnCl42- complex is predominant at all temperatures up to and including 430 °C. The Zn-Cl bond length was found to decrease uniformly with temperature, up to nearly 2% at 430 °C in comparison to the value at 25°C. The iron ion appears to be predominantly hydrated up to some temperature between 100 °C and 200 °C. Above 200 °C , iron in the inclusions is predominantly coordinated by chlorine ligands.
© EDP Sciences 1997