Quartz-sillimanite knots and metamorphism at Southern Indian Lake, Manitoba

Simple item page
dc.contributor.authorCranstone, John Ronalden_US
dc.date.accessioned2012-05-14T18:04:11Z
dc.date.available2012-05-14T18:04:11Z
dc.date.issued1971en_US
dc.degree.disciplineEarth Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractAll outcrops in the area surrounding the northern portion of Southern Indian Lake were mapped during the summers of 1969 and 1970, and a report with accompanying geological maps has been prepared for the Manitoba Mines Branch. Quartz-muscovite-microcline-plagioclase-sillimanite nodules occurring in five outcrops of Sickle-type metasediments were mapped and sampled in detail. Twenty thin sections were studied and six chemical analyses done. The almost spherical knots are late or post tectonic, formed subsequent to two periods of folding. The metamorphic grade reached during the first period of folding (intense, isoclinal) is uncertain, however, extensive recrystallization occurred. The metamorphic grade reached during a second period of deformation (north-east trending) was the upper amphibolite facies of the low or medium (cordierite bearing) pressure facies series. Actual knot formation presumably was by simple metamorphic differentiation and segregation in beds of a suitable composition during increasing metamorphism or, less likely, was the result of potash realkalization of quartz-sillimanite knots formed in an earlier dealkalization event. Quartz muscovite knots occurring elsewhere in the Lynn Lake District appear to have formed at somewhat lower metamorphic grade.en_US
dc.format.extentvii, 49 leaves :en_US
dc.identifierocm72760750en_US
dc.identifier.urihttp://hdl.handle.net/1993/5796
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.titleQuartz-sillimanite knots and metamorphism at Southern Indian Lake, Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Cranstone_Quartz-sillimanite_knots.pdf
Size:
7.53 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
FGS - Electronic Theses and Practica
Manitoba Heritage Theses