gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1994.58A.2.222 The Thermal History of the Lower Crust Recorded by Zircon Growth and Recrystallization: An Ion Microprobe (SHRIMP) Study from the Ivrea Zone (Southern Alps) Vavra G. Gebauer D. Schmid R. Department of Earth Sciences, ETH-Zentrum, CH-8092 Zürich, Switzerland August–September 1994 58A 2 936 937 Copyright © 1994, The Mineralogical Society 1994