gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.1.248 Modelling the Interactions Between Biospheric and Weathering Processes: Towards a Mechanistic Description of the Land Environment François L. Laboratoire de Physique Atmosphérique et Planétaire, Université de Liège, 5 avenue de Cointe, B-4000 Liège, Belgium Goddéris Y. Department of Geology, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada Munhoven G. School of Geographical Sciences, University of Bristol, University Road, Bristol, BS8 1SS, UK 1998 62A 1 468 469 Copyright © 1998, The Mineralogical Society 1998