gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.164 Natural Copper and Zinc Isotopic Compositions Measured by Plasma-Source Mass Spectrometry Maréchal C. N. Albarède F. Télouk P. Laboratoire des Sciences de la Terre, Ecole Normale Supérieure de Lyon, 69364 Lyon Cédex 07, France 1998 62A 2 947 948 Copyright © 1998, The Mineralogical Society 1998