gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1994.58A.2.68 Fluid-Rock Interactions in Chalk Groundwater Systems: An Initial Investigation into the Geochemical Composition of Upper Cretaceous Chalks from SE England Murphy A. Jarvis I. School of Geological Sciences, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey, KT1 2EE, UK August–September 1994 58A 2 638 638 Copyright © 1994, The Mineralogical Society 1994