gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.233 ³He/⁴He ratios in Kerguelen Archipelago Basalts: New Evidence for an Undegassed Mantle Plume Component Nicolaysen K. Frey F. Dept. of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA Kurz M. Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institute, Woods Hole, MA, USA Weis D. Dépt. Sciences de la Terre et de l'Environnement, CP. 160/02, Univ. Libre de Bruxelles, B-1050 Brussels, Belgium Leyrit H. Centre Polytechnique Saint Louis, Cergy-Pontoise, France Giret A. Université Jean Monnet, St. Étienne, France 1998 62A 2 1083 1084 Copyright © 1998, The Mineralogical Society 1998