gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.68 Systematics of ²³⁸U-²³⁰Th-²²⁶Ra in Primitive Lavas from the 1730–36 Eruption on Lanzarote, Canary Islands, and Implications for Oceanic Basalt Formations Sigmarsson O. Centre de Recherches Volcanologiques, CNRS-URA10, Universite Blaise Pascal, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Carn S. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK Carracedo J. C. Volcanological Station of the Canary Islands, Spanish Research Council, P.O. Box 195, 38206 La Laguna, Tenerife, Canary Islands, Spain 1998 62A 3 1402 1403 Copyright © 1998, The Mineralogical Society 1998