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TitleProject Unit 13-002. Geology and genesis of mobilized chromitite in the Black Label Pyroxenite Zone of the Black Thor intrusive complex, McFaulds Lake greenstone belt, Ontario
AuthorSpath, C J, III; Lesher, C M; Houlé, M G
SourceSummary of field work and other activities, 2013; by Ontario Geological Survey; Ontario Geological Survey, Open File Report 6290, 2013 p. 54.1-54.7 Open Access logo Open Access
LinksOGS OFR 6290 Online - En ligne (pdf, 204 MB)
Alt SeriesEarth Sciences Sector, Contribution Series 20130224
PublisherOntario Geological Survey
Mediapaper; on-line; digital
File formatpdf
NTS43D/16; 43E/01
AreaMcFaulds Lake
Lat/Long WENS -86.5000 -86.0000 53.2500 52.7500
Subjectsigneous and metamorphic petrology; metallic minerals; petrogenesis; chromitites; pyroxenites; ultramafic rocks; intrusive rocks; mafic rocks; peridotites; gabbros; dunites; breccias; petrographic analyses; lithology; cores; McFaulds Lake greenstone belt; Black Label deposit; Black Thor intrusive complex; Precambrian
ProgramTargeted Geoscience Initiative (TGI-4) Mafic-Ultramafic Ore Systems
AbstractThe Black Thor intrusive complex (BTIC) occurs within the McFaulds Lake greenstone belt (circa 2.7 to 2.8 Ga) in northern Ontario and comprises a lower ultramafic series of dunite and peridotite; a middle ultramafic series of dunite, peridotite and chromitite (Black Thor and Black Label horizons); and an upper ultramafic to mafic series of peridotite, olivine pyroxenite, pyroxenite, melagabbro, mesogabbro, leucogabbro and anorthosite (see Carson et al., this volume, Figures 52.1 and 52.2; see also Carson et al. 2013; Weston and Shinkle 2013). A late pyroxenite-the focus of this study-intruded the lower ultramafic series and the basal part of the middle ultramafic series, including the Black Label chromitite horizon, producing a wide array of hybrid dunite, peridotite, olivine pyroxenite and chromitite units, and angular to amoeboidal chromitite breccias. (Unless noted otherwise, the olivine in all rocks has been serpentinized; all rocks have been metamorphosed, but the "meta" prefix on all rock names has been omitted for convenience and clarity.)
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. The purpose of this contribution is to present the main objectives, research methods, preliminary results, preliminary implications, and future work for this MSc study undertaken by C. Spath at Laurentian University. The topic of the study is the geology and genesis of mobilized chromitite in the Black Label pyroxenite zone of the Black Thor Intrusive Complex, McFaulds Lake Greenstone Belt, Ontario.

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