Rhenium-Osmium Isotope Systematics in Southern African and Siberian Peridotite Xenoliths and the Evolution of Subcontinental Lithospheric Mantle - Pearson, D.G.; Shirey, S.B.; Carlson, R.W.; Boyd, F.R.; Nixon, P.H.; Pokhilenko, N.P.; Brown, L. (International Kimberlite Conference: Extended Abstracts, 1991)