gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1994.58A.1.243 Anomalously Old Ar-Ar Ages in High Pressure Metamorphic Terrains Kelley S. P. Dept of Earth Sciences, Open University, Milton Keynes, UK Arnaudá N. O. URA 10, Dept des Sciences de la Terre, Clermont-Ferrand, France Okay A. I. ITÜ, Maden Fakültesi, Jeoloji Bölümü, Ayazafa, Istanbul, Turkey 8 1994 58A 1 468 469 Copyright © 1994, The Mineralogical Society 1994