gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.175 A Multi-Age, U-Pb and ⁴⁰Ar/³⁹Ar Approach to the Calibration of Fish Canyon Tuff Sanidine as a Flux Monitor Villeneuve M. E. Sandeman H. A. Davis W. J. Geological Survey of Canada, 601 Booth St., Ottawa, Ontario, K1A 0E8, Canada Mortensen J. K. University of British Columbia, Vancouver, B.C., Canada Dazé A. Lee J. K. W. Queens University, Kingston, Ontario K7L 3N6, Canada 1998 62A 3 1605 1606 Copyright © 1998, The Mineralogical Society 1998