The petrology, mineralogy and geochemistry of the Cinder Lake alkaline intrusive complex, eastern Manitoba

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dc.contributor.authorKressall, Ryan
dc.contributor.examiningcommitteeBöhm, Christian (Manitoba Geological Survey) Zaitsev, Anatoly (Department of Mineralogy, St. Peterburg State University)en_US
dc.contributor.supervisorAnton Chakhmouradian (Geological Sciences)en_US
dc.date.accessioned2012-01-05T16:41:22Z
dc.date.available2012-01-05T16:41:22Z
dc.date.issued2012-01-05
dc.degree.disciplineGeological Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractA 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.description.noteFebruary 2012en_US
dc.identifier.urihttp://hdl.handle.net/1993/5030
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectsilica-undersaturateden_US
dc.subjectsyeniteen_US
dc.subjectArcheanen_US
dc.subjectKnee Lakeen_US
dc.subjectSuperioren_US
dc.subjectcarbonatiteen_US
dc.titleThe petrology, mineralogy and geochemistry of the Cinder Lake alkaline intrusive complex, eastern Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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