gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.1.275 Precise Measurement of Growth Rate Variations in Atlantic, Indian and Pacific Ferromanganese Crusts, Derived from ¹⁰Be/⁹Be Ratios Gibb A. J. O'Nions R. K. Frank M. Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK 1998 62A 1 519 520 Copyright © 1998, The Mineralogical Society 1998