Metamorphic petrology of the Gillam area, Manitoba

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dc.contributor.authorElphick, Stephen Conraden_US
dc.date.accessioned2012-05-10T21:14:11Z
dc.date.available2012-05-10T21:14:11Z
dc.date.issued1970en_US
dc.degree.disciplineEarth Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractFollowing mapping of the Gillam area, Northern Manitoba, by Dr. I. Haugh and S.C. Elphick, during the summer of 1968, and publication of a preliminary report in the Manitoba Mines Branch Geological Paper 3/68, further work was done on samples by Mr. Elphick. This was an examination of the petrology and mineralogy of the gneisses, using 300 thin-sections and 150 slabs stained for potash feldspar. Plagioclase compostions were measured in 80 thin-sections. 40 samples from various areas were point counted for modal mineral composition. With these data the original map was revised, a more detailed stratigraphic sequence drawn up, and a plagioclase anorthite content distribution map drafted. Two periods of folding are recognisable both on geologic and aeromagnetic maps. The earlier period involved the formation of west-north-west, near isoclinal folds, with axial planes steeply dipping to the north. Metamorphism produced sillimanite, under moderately low pressure conditions (Abukuma type). The second metamorphic event involved formation of broad Z-folds, axial planes trending north-east, refolding the earlier isoclines Metamorphic grade was lower than the first event, and was of lowest sillimanite or greenschist facies. During the first episode iron was a mobile constituent, as proven by various textural relations displayed by the magnetite. Calcium distribution in plagioclase was established during this period, and results indicate strict dependence of plagioclase-anorthite-content on bulk calcium content of each gneiss.en_US
dc.format.extentv, 96 leaves :en_US
dc.identifierocm72767312en_US
dc.identifier.urihttp://hdl.handle.net/1993/5606
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.titleMetamorphic petrology of the Gillam area, Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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