gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.139 Implication of Stepwise Heating and UV Laser Ablation ⁴⁰Ar-³⁹Ar and U-Pb Data on the Timing of Ductile Movement in the Irtysh Shear Zone and the Kalbinsky Granite Magmatism (East Kazakhstan) Travin A. V. Ponomarchuk V. A. Ponomareva A. P. United Institute of Geology, Geophysics and Mineralogy, SB RAS, ac. Koptuga av.3, 630090 Novosibirsk, Russia Theunissen K. Department of Geology and Mineralogy, Royal Museum for Central Africa, Tervuren B-3080, Belgium Boven A. Vrije Universiteit Brussel, Laboratory of Geochronology, Pleinlaan 2, 10540 Brussels, Belgium Vladimirov A. G. United Institute of Geology, Geophysics and Mineralogy, SB RAS, ac. Koptuga av.3, 630090 Novosibirsk, Russia Khalilov V. A. Geologycal Institute, KAS, Kalinina 69a, 480100 Alma-Ata, Khazakhstan Kruk N. N. Vladimirov V. G. United Institute of Geology, Geophysics and Mineralogy, SB RAS, ac. Koptuga av.3, 630090 Novosibirsk, Russia Melnikov A. Institute of the Earths' Crust, SB RAS Irkutsk, Russia Plotnikov A. V. United Institute of Geology, Geophysics and Mineralogy, SB RAS, ac. Koptuga av.3, 630090 Novosibirsk, Russia 1998 62A 3 1535 1536 Copyright © 1998, The Mineralogical Society 1998