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TitleProject Unit 13-001. Overview of the mafic and ultramafic intrusions in the eastern Uchi domain of the Superior Province, northern Ontario
AuthorSappin, A A; Houlé, M G; Lesher, C M; McNicoll, V J
SourceSummary of field work and other activities, 2013; by Ontario Geological Survey; Ontario Geological Survey, Open File Report 6290, 2013 p. 51.1 - 51.16
Alt SeriesEarth Sciences Sector, Contribution Series 20130231
PublisherOntario Geological Survey
Mediapaper; on-line; digital
File formatpdf
AreaAlbany River
Lat/Long WENS-89.4808 -85.7972 52.1822 51.0289
Subjectsmetallic minerals; structural geology; igneous and metamorphic petrology; geochronology; geochemistry; intrusive rocks; mafic rocks; ultramafic rocks; mineralization; chromium; nickel; platinum; copper; iron; titanium; vanadium; lithology; magmatic deposits; bedrock geology; metavolcanic rocks; cores; field relations; metamorphism; deformation; zircon dates; uranium lead dates; magmas; magma differentiation; petrogenesis; Uchi Domain; North Caribou terrane; Superior Province; Oxford-Stull domain; Miminiska-Fort Hope greenstone belt; platinum group elements; Precambrian
Illustrationslocation sketch maps; geochemical analyses
ProgramMafic-Ultramafic Ore Systems, Targeted Geoscience Initiative (TGI-4)
LinksOGS OFR 6290 Online - En ligne (pdf, 204 MB)
AbstractSeveral mafic and ultramafic intrusions occur within the eastern Uchi domain of the North Caribou terrane in the Superior Province (see Houlé and Metsaranta, this volume, Figure 49.1). Recently, the discovery of a number of deposits and prospects (e.g., Black Thor (chromium), Black Label (chromium), Eagle's Nest (nickel-copper-platinum group element (PGE)) and Thunderbird (iron-titanium-vanadium)) in the McFaulds Lake greenstone belt, located in the northern part of the Oxford-Stull domain in the Superior Province (see Houlé and Metsaranta, this volume, Figure 49.1), have highlighted the potential of the eastern Uchi domain to host orthomagmatic mineralization. These discoveries justify further investigation outside the McFaulds Lake greenstone belt.
This article presents preliminary results as part of the high-magnesium ultramafic to mafic systems subproject under the Targeted Geoscience Initiative 4 (TGI-4), of the Geological Survey of Canada (GSC), which is part of the Earth Sciences Sector of Natural Resources Canada. The objective of this work is to assess the potential of mafic and ultramafic intrusions to host chromium-PGE, nickel-copper-PGE, and iron-titanium-vanadium mineralization within the eastern part of the Oxford-Stull and the Uchi domains. In this contribution, we build an inventory of all known mafic and ultramafic intrusions located in the vicinity of the Miminiska-Fort Hope greenstone belt (MFHGB) to assess the nickel-copper-PGE, chromium-PGE, and iron-titanium-vanadium potential of the eastern part of the Uchi domain. More specifically, we address the geological setting, the style of mineralization, the nature of the parental magmas, and the degree of the magmatic differentiation and crustal contamination of silicate magmas associated with the main intrusions in the region. All of this information will be useful in identifying the most prospective areas for hosting mafic to ultramafic intrusions with orthomagmatic deposits in the eastern Uchi lithotectonic domain.
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. In this contribution, we build an inventory of all known mafic and ultramafic intrusions located in the eastern part of the Uchi domain and we are addressing briefly the geochemical characteristics of some of these intrusions. All these information will be useful to identify the most prospective area for nickel, copper, iron, titanium, and platinum-group element exploration in this geological domain.