gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.11 The Behaviour of Thorium Isotopes During the Decomposition of Large Marine Particles: In vitro Experiments and Field Data Roy-Barman M. Coppola L. Arraes-Mescoff R. Souhaut M. Jeandel C. LEGOS (CNES/CNRS/UPS) OMP, 14, Avenue Edouard Belin, 31400 Toulouse, France. 1998 62A 3 1295 1296 Copyright © 1998, The Mineralogical Society 1998