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TitleCurrent research part A / Recherches en cours partie A
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorGeological Survey of Canada
SourceGeological Survey of Canada, Paper no. 85-1A, 1985, 802 pages, Open Access logo Open Access
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
Subjectsgeneral geology
Released1984 12 01; 2013 04 26
AbstractThe northeast-striking Kapuskasing structural zone of high-grade metamorphic rocks is not present in the 60 km wide area between Kapuskasing and Fraserdale. Amphibolite-facies orÙwgneiss occurs between the southern Groundhog and the northern Fraserdale-Moosonee high-grade metamorphic blacks. The River southern block consists of tonalite, mafic gneiss and paragneiss metamorphosed to the granulite and upper amphibolite facies. It is in fault contact with granite to the east and gneiss in the amphibolite facies to the west. To the north, the Fraserdale-Moosonee Block is made up of anhydrous granulite of psammitic metasedimentary and intermediate igneous composition. A pseudotachylite zone separates the granulites from granitoid rocks and gneiss in major the amphibolite facies to the east; smaller fault zones within the block as well as between and orthopyroxene-bearing occur metasedimentary gneiss of the Quetico belt to the west. it Within the 120 km long zone of granulites in the Quetico belt, the proportion and grain size of orthopyroxenes and garnet increases toward the east at the expense of biotite, suggesting that metamorphic grade increases toward the anhydrous granulites of the Fraserdale­M oosonee Block. Although this apparent metamorphic pattern requires further study by geothermobarometry, appears to support the model of a tilted crustal section west of the Kapuskasing it structure.

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