gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.92 Constraints on Sm-Nd Diffusion Rates from Laser Ablation ICP-MS Analyses and Conventional Dating of Prograde Garnets Kosler J. Vance D. Harris N. Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UK Günther D. Institute for Isotope Geology and Mineral Resources, ETH-Zentrum, Zürich, CH-8092, Switzerland 1998 62A 2 807 808 Copyright © 1998, The Mineralogical Society 1998