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dc.contributor.supervisor Anton Chakhmouradian (Geological Sciences) en_US
dc.contributor.author Kressall, Ryan
dc.date.accessioned 2012-01-05T16:41:22Z
dc.date.available 2012-01-05T16:41:22Z
dc.date.issued 2012-01-05
dc.identifier.uri http://hdl.handle.net/1993/5030
dc.description.abstract A suite of silica-undersaturated syenites outcrops along the margins of a monzogranite pluton emplaced in the Knee Lake greenstone belt at Cinder Lake, Manitoba. Alkali-feldspar syenitic pegmatite probably represents a cumulate unit derived from magma that subsequently evolved to fine-grained feldspathoid syenites. This evolution involved an increase in the degree of undersaturation from cancrinite-nepheline syenite to vishnevite syenite. Abundant calcite veinlets, showing a carbonatitic isotopic and trace-element signature, crosscut the pegmatite and are interpreted to have evolved from the syenites. The monzogranite and syenites gave similar radiometric ages (~2.72 Ga), but evidence of fenitization in the former suggests that the syenites are somewhat younger. The emplacement of these rocks was coeval with the collision of the North Caribou and North Superior superterranes during amalgamation of the Superior Province. The observed transition from granitic to alkaline magmatism is interpreted to mark the transition from a collisional to post-collisional tectonic regime. en_US
dc.subject silica-undersaturated en_US
dc.subject syenite en_US
dc.subject Archean en_US
dc.subject Knee Lake en_US
dc.subject Superior en_US
dc.subject carbonatite en_US
dc.title The petrology, mineralogy and geochemistry of the Cinder Lake alkaline intrusive complex, eastern Manitoba en_US
dc.degree.discipline Geological Sciences en_US
dc.contributor.examiningcommittee Böhm, Christian (Manitoba Geological Survey) Zaitsev, Anatoly (Department of Mineralogy, St. Peterburg State University) en_US
dc.degree.level Master of Science (M.Sc.) en_US
dc.description.note February 2012 en_US


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