The Origin of Adakites in the Garibaldi Volcanic Complex, Southwestern British Columbia, Canada
The Origin of Adakites in the Garibaldi Volcanic Complex, southwestern British Columbia, Canada A Thesis Submitted to the Faculty of Graduate Studies and Research In Partial Fulfillment of the Requirements For the Degree of Master of Science In Geology University of Regina By Julie Anne Fillmore Regina, Saskatchewan November 2014 Copyright 2014: J.A. Fillmore UNIVERSITY OF REGINA FACULTY OF GRADUATE STUDIES AND RESEARCH SUPERVISORY AND EXAMINING COMMITTEE Julie Anne Fillmore, candidate for the degree of Master of Science in Geology, has presented a thesis titled, The Origin of Adakites in the Garibaldi Volcanic Complex, Southwestern British Columbia, Canada, in an oral examination held on August 22, 2014. The following committee members have found the thesis acceptable in form and content, and that the candidate demonstrated satisfactory knowledge of the subject material. External Examiner: Dr. Martin Beech, Campion College Supervisor: Dr. Ian M. Coulson, Department of Geology Committee Member: Dr. Tsilavo Raharimahefa, Department of Geology Chair of Defense: Dr. Josef Buttigieg, Department of Biology ii Abstract The Garibaldi Volcanic Complex (GVC) is located in southwestern British Columbia, Canada. It comprises two volcanic fields: the Garibaldi Lake Volcanic Field (GLVF) in the north and the Mount Garibaldi Volcanic Field (MGVF) in the south. Petrographical and geochemical studies on volcanic rocks collected from the GVC have determined that they exhibit adakitic characteristics; these intermediate rocks range from basaltic andesite to dacite represented mainly by lava flows, domes and minor pyroclastic material. All the lavas exhibit evidence of magma mixing, which include sieve textured crystals, dehydration reaction textures, differently sized phenocryst populations, xenocrysts and xenoliths.
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