Genesis of mafic migmatites from the Kapuskasing structural zone, Ontario, Canada

dc.contributor.advisorPattison, David R. M.
dc.contributor.authorHartel, Tijmen H.D.
dc.descriptionBibliography: p. 188-204.en
dc.description.abstractInterlayered tonalitic and mafic gneisses from the Kapuskasing Structural Zone have been metamorphosed to upper-amphibolite/granulite facies. The mafic gneisses are heterogeneous, comprising diopside-garnet-plagioclasesphene- rich (Di-Grt-Pl-Spn) layers, hornblende-plagioclase-rich (Hbl-Pl) layers, and all gradations in between. Plagioclase-quartz-rich (Pl-Qtz) leucosomes occur in a variety of textures in the mafic gneiss, ranging in scale from ?m to dm. Leucosome is generally associated with the hornblende-rich layers and gives the rock a migmatitic appearance. A combination of outcrop textures, microscope textures, modal mineralogy, and mineral analyses suggest that hornblende and plagioclase reacted to form diopside, garnet, sphene and trondhjemitic leucosome. Mass balance analysis, using matrix-algebraic techniques, resulted in the following continuous migmatite-forming reaction consistent with textural, modal and chemical data: Hbl + 0.95 MgFe.1 + Ca-Pl + 0.16 NaSiCa_1A1_1 + 3.42 Qtz => => 1.41 Grt + 1.13 Di+ 0.19 Spn + 1.45 Pl-Qtz (leucosome) Textural, mineralogical and chemical evidence suggest that the plagioclasequartz leucosomes and films (micro-leucosomes) may represent crystallized trondhjemitic melt that formed according to the above dehydration-melting reaction. This is consistent with estimated P-T conditions of 740°C and 9 kbar (=27 km depth) for the KSZ migmatites.
dc.format.extentxix, 270 leaves : ill. ; 30 cm.en
dc.identifier.citationHartel, T. H. (1993). Genesis of mafic migmatites from the Kapuskasing structural zone, Ontario, Canada (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from doi:10.11575/PRISM/15351en_US
dc.identifier.lccQE 475 M5 H37 1993aen
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccQE 475 M5 H37 1993aen
dc.subject.lccAdditional Copy: QE 475 M5 H37 1993en
dc.subject.lcshMigmatite - Ontario
dc.titleGenesis of mafic migmatites from the Kapuskasing structural zone, Ontario, Canada
dc.typemaster thesis and Geophysics of Calgary of Science (MSc)
ucalgary.thesis.accessionTheses Collection 58.002:Box 872 520541917
ucalgary.thesis.additionalcopyQE 475 M5 H37 1993en
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