Graphite-Bearing Peridotites from the Kaapvaal Craton their Carbon Isotopic Compositions and Implications for Peridotite Thermobarometry - Pearson, D.G.; Boyd, F.R.; Field, S.W.; Pasteris, J.D.; Haggerty, S.E.; Nixon, P.H. (International Kimberlite Conference: Extended Abstracts, 1991)