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TitleAn occurrence of Sapphirine in the Archean Superior Province, northern Quebec
AuthorCadéron, S; Trzcienski, W E, Jr.; Bédard, J H; Goulet, N
SourceCanadian Mineralogist vol. 43, no. 1, 2005 p. 463-478, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 2005296
Alt SeriesQuebec Department of Natural Resources, Contribution 2001-5130-21
PublisherMineralogical Association of Canada
Mediapaper; on-line; digital
File formatpdf
Arealac Peters; Ungava Peninsula; lac Tasialujjuaq; lac Qimussinguat; lac de Thury; lac Troie; lac Faribault
Lat/Long WENS -72.0000 -70.0000 60.0000 59.0000
Subjectsigneous and metamorphic petrology; tectonics; Archean; sapphirine; metasedimentary rocks; thermobarometry; granulites; clasts; deformation; felsic intrusive rocks; volcano-sedimentary strata; tonalites; trondhjemites; igneous rocks; volcanic rocks; metamorphic rocks; breccias; feldspar; textural analyses; pressure-temperature conditions; metamorphism, prograde; metamorphism, retrograde; orogenesis; terranes; geological history; pyroxene; plutons; sillimanite; cordierite; tectonic evolution; gabbros; granites; metabasalts; monzonites; porphyries; quartz; schlieren; shear zones; corundum; spinel; modelling; mineral assemblages; crustal evolution; granulite facies; amphibolite facies; magmas; magmatism; intrusions; Superior Province; Douglas Harbour Domain; Minto Subprovince; Qimussinguat Complex; Faribault-Thury Complex; Troie Complex; Thury Shear Zone; Leridon Suite; enderbite; symplectite; hercynite; gabbronorites; mineral compositions; cratonization; supracrustal rocks; Precambrian; Proterozoic
Illustrationslocation maps; geological sketch maps; tables; photomicrographs; plots; phase diagrams; graphs
ProgramFCAR - Fonds pour la Formation de Chercheurs et l'Aide à la Recherche
AbstractA clast containing sapphirine has been found in the Troie Complex in the Archean Minto Subprovince, in the northeastern part of the Superior Province, in northern Quebec. The area is dominated by synmagmatically deformed felsic plutonic rocks that host volcano-sedimentary slivers and rafts. The Douglas Harbour Domain contains the Faribault-Thury tonalite-trondhjemite complex, intruded by the 2740-2726 Ma enderbitic Troie Complex. Slivers and enclaves of volcano-sedimentary rocks in the Troie Complex are metamorphosed to granulite grade. A breccia in the core of the Troie Complex contains a heterogeneous population of xenoliths in an enderbitic matrix. The clast contains sapphirine as symplectitic rims with plagioclase or K-feldspar (or with both) developed around sillimanite and cordierite. Sapphirine also forms a corona around green hercynite, with K-feldspar rimming the sapphirine. Reaction textures, annealing and polygonization indicate localized equilibration, with mosaic equilibrium preserved on the thin-section scale. Various geothermobarometers yield estimates of high temperatures (755-1260°C) and pressures (7.5-14 kbar). The existence of localized equilibria is difficult to interpret in terms of simple prograde or retrograde metamorphism linked with orogenesis. Either static P-T conditions for a protracted period, or minimal attainment of granulite-facies conditions are required to produce and preserve these mosaic textures.

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