Hawley Medal to D. Barrie Clarke for the best paper published in The Canadian Mineralogist in 2007: Clarke D.B. (2007) Assimilation of xenocrysts in granitic magmas: principles, processes, proxies, and problems. Can. Mineral. 45, 5-30.
D. Barrie Clarke was born in Newcastle, New Brunswick, but moved to Toronto at an early age. During his high school years there, he developed an interest in geology, and encouragement from Ron Graham and Len Berry at that time had a formative impact on his career path. He then spent the entire 1960s attending university, first at the University of Toronto where he earned BSc and MA degrees under the inspiring direction of Digger Gorman, Tuzo Wilson, and Jeff Fawcett, then at the University of Edinburgh where he earned his PhD under the formidable direction of Brian Upton, Keith Cox, and Mike O'Hara, and finally at the University of Alberta where he enjoyed a one-year postdoctoral fellowship with the dynamic duo of Dorian Smith and Bud Baadsgaard. During those early years, Barrie's work focused on the Paleocene basalts of Baffin Bay, as well as on basalts from the mid-Atlantic Ridge, the Labrador Sea, and Davis Strait. Soon after joining the faculty of Dalhousie University in 1970, however, his attention turned to the mineralogy of kimberlites (in particular, garnet and djerfisherite), and also to the mineralogy, petrology, and petrogenesis of peraluminous granites. At MAC's 25th anniversary in Halifax in 1980, he convened a symposium on peraluminous granites, led a field trip, and edited a special issue of The Canadian Mineralogist (volume 19, pages 3-216). Over the ensuing years, Barrie produced many papers on micas, cordierite, garnet, andalusite, and oxides of peraluminous granites, and wrote a book entitled Granitoid Rocks. During that time, support from the Alexander von Humboldt Stiftung to undertake experimental work at Rheinische Friedrich-Wilhelms-Universitãt in Bonn and at GeoForschungsZentrum in Potsdam, substantially added to his research portfolio. At MAC's 50th anniversary in Halifax in 2005, Barrie co-convened a symposium on contaminated granites with Scott Paterson and Ron Vernon, co-led a field trip with Saskia Erdmann, and co-edited a special issue of The Canadian Mineralogist (volume 45, pages 1-178). Although Barrie retired from teaching and administration at Dalhousie in 2007, he steadfastly refuses to retire from research because many more minerals from peraluminous granites, including topaz, sulphides, and silver-bearing feldspars (?), still have fascinating stories to tell.