gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1982.046.338.15 Genesis of Tourmalinites from Belgium: Petrographical and Chemical Evidence Fieremans M. Laboratorium voor Strukturele Geologie—KULeuven Redingenstraat 16 bis, B-3000 Leuven, Belgium De Paepe P. Laboratorium voor Aardkunde—RUGent Krijgslaan 271, B-9000 Gent, Belgium 3 1982 46 338 95 102 30 10 1980 23 2 1981 Copyright © 1982, The Mineralogical Society 1982 Abstract

The petrographical and chemical characteristics of the tourmalinite pebbles from the Lower Devonian conglomerates of Belgium are presented together with selected trace element data. The tourmalinites are shown to represent metasomatically altered rocks of variable origin and composition. A model of subvolcanic hydrothermal alteration is proposed.