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The Nature and Origin of the Granulites of Mont Tremblant Park, Quebec

1969; Geological Society of America; Volume: 80; Issue: 10 Linguagem: Inglês

10.1130/0016-7606(1969)80[2019

1943-2674

Michael B. Katz,

Mineralogy and Gemology Studies

Research Article| October 01, 1969 The Nature and Origin of the Granulites of Mont Tremblant Park, Quebec MICHAEL B KATZ MICHAEL B KATZ Department of Geology, University of Ceylon, Peradeniya, Ceylon Search for other works by this author on: GSW Google Scholar Author and Article Information MICHAEL B KATZ Department of Geology, University of Ceylon, Peradeniya, Ceylon Publisher: Geological Society of America Received: 30 Dec 1968 Revision Received: 24 Mar 1969 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1969, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1969) 80 (10): 2019–2038. https://doi.org/10.1130/0016-7606(1969)80[2019:TNAOOT]2.0.CO;2 Article history Received: 30 Dec 1968 Revision Received: 24 Mar 1969 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation MICHAEL B KATZ; The Nature and Origin of the Granulites of Mont Tremblant Park, Quebec. GSA Bulletin 1969;; 80 (10): 2019–2038. doi: https://doi.org/10.1130/0016-7606(1969)80[2019:TNAOOT]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Mont Tremblant Park granulites can be divided into two main groups: pink, quartzofeld-spathic rocks and green-gray hypersthenic rocks. The quartzofeldspathic granulites are interlayered with garnet-sillimanite gneisses and locally occur as cores of folds or large massifs. More commonly, they are regionally interbanded with the hypersthene granulites. All the granulites are intruded by the quartz mangerites of the Morin anorthosite suite.Geochemical considerations based on ternary variation diagrams and relationships in the albite-orthoclase-anorthite system show that the two groups of granulites have different compositional trends, converging at the extreme granitic end. Mineralogical and geochemical data are consistent with granulite facies conditions of metamorphism.The composition of the granulites and their field relationships are consistent with their postulated derivation from a graywacke-shale geosynclinal sequence. Under granulite facies conditions, partial anatexis formed granitic melts. This anatectic differentiation caused the graywackes to attain a composition appropriate to form hypersthenic rocks and the shales to produce quartzofeldspathic rocks with residual sillimanite-garnet layers. These rocks were deformed during the intrusion of the anorthosite suite, and the characteristic fabrics of the granulites were produced. Volatiles given off by late-stage granite magmas caused retrograde effects at contacts. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.