gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.101 Hafnium and Strontium Isotope Measurements in High-MgO Basalts from Theistareykir, Northern Iceland Stracke A. Zindler A. National High Magnetic Field Laboratory (NHMFL) and Department of Geology, Florida State University, E. Paul Dirac Drive, Tallahassee, Florida, 32306, USA Blichert-Toft J. Albarède F. Laboratoire des Sciences de la Terre, Ecole Normale Supérieure de Lyon, 69364 Lyon Cedex 07, France McKenzie D. Department of Earth sciences, Univ. of Cambridge, Bullard Laboratories, Madingley Rise, Madingley Road, Cambridge, CB3 OEZ UK 1998 62A 3 1464 1465 Copyright © 1998, The Mineralogical Society 1998