gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1994.58A.2.104 A Re-Os Isotopic and Petrological Study of Namibian Peridotites: Contrasting Petrogenesis and Composition of on- and Off-Craton Lithospheric Mantle Pearson D. G. Rogers N. W. Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UK Boyd F. R. Geophysical Laboratory, Carnegie Institution of Washington, 5252 Broad Branch Rd, N.W. Washington, D.C. 20015, USA Hoal K. E. O. Rio Tinto Namibia, P.O. Box 1079, Windhoek, Namibia Hoal B. G. Geological Survey of Namibia, 1 Jeans St, Windhoek, Namibia Nixon P. H. Department of Earth Sciences, Leeds University, Leeds, LS2 9JT, UK August–September 1994 58A 2 703 704 Copyright © 1994, The Mineralogical Society 1994