gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.273 The Genesis of Natrocarbonatites: Constraints from Experimental Petrology and Trace Element Partition Coefficients Petibon C. M. Jenner G. A. Department of Earth Sciences, Memorial University of Newfoundland, St JohnNs, Newfoundland, Canada A1B 3X5 Kjarsgaard B. A. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada K1A 0E8 1998 62A 2 1161 1162 Copyright © 1998, The Mineralogical Society 1998