gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.165 Methods for Evaluating the Effects of Diagenesis on the U37K Index Marlow J. R. Farrimond P. Rosell-Melé A. Dept. Fossil Fuels & Environmental Geochemistry, Drummond Building, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK 1998 62A 2 949 950 Copyright © 1998, The Mineralogical Society 1998