gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1984.048.348.01 Recent Advances in Ideas on the Origin of the Igneous Rocks of the Tertiary Igneous Province—Introduction Walsh J. N. Department of Geology, King’s College, Strand, London WC2 2LS 9 1984 48 348 309 310 9 4 1984 Copyright © 1984, The Mineralogical Society 1984