gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.266 Lithospheric Evolution in Circum-Cratonic Settings: A Re-Os Isotope Study of Peridotite Xenoliths from the Vitim Region, Siberia Pearson D. G. Department of Geological Sciences, Durham University, South Rd, Durham, DH1 3LE, UK Ionov D. GEMOC, School of Earth Sciences, Macquarie University, Sydney, N.S.W. 2109, Australia Carlson R. W. Shirey S. B. Department of Terrestrial Magnetism, Carnegie Institute of Washington, 5241 Broad Branch Rd, N.W., Washington, DC, 20015, USA 1998 62A 2 1147 1148 Copyright © 1998, The Mineralogical Society 1998