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TitleGeology of the Southern Indian Lake area, north-central Manitoba (parts of NTS 64G1, 2, 7-10, 64H3-6)
AuthorMartins, T; Kremer, P D; Corrigan, DORCID logo; Rayner, NORCID logo
SourceManitoba Geological Survey, Geoscientific Report GR2019-1, 2019, 51 pages (4 sheets) Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20190061
PublisherManitoba Growth, Enterprise and Trade (Winnipeg, Canada)
MapsPublication contains 4 maps
Map Info.geological, lithological, stratigraphic, structural, 1:50,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 14 (NAD83)
Mediaon-line; digital
File formatpdf (Adobe® Reader®)
NTS64G/01; 64G/02; 64G/07; 64G/08; 64G/09; 64G/10; 64H/03; 64H/04; 64H/05; 64H/06
AreaSouthern Indian Lake
Lat/Long WENS -99.0000 -97.0000 57.7500 57.0000
Subjectsregional geology; stratigraphy; structural geology; geochemistry; geochronology; tectonics; economic geology; Science and Technology; Nature and Environment; bedrock geology; lithology; granitic rocks; igneous rocks; intrusive rocks; monzo-granites; granodiorites; pegmatites; mafic intrusive rocks; granites; tonalites; ultramafic rocks; volcanic rocks; basalts; volcaniclastics; breccias; tuffs; lava flows; rhyolites; metamorphic rocks; gneisses; metavolcanic rocks; metabasalts; metasedimentary rocks; psammites; pelites; paragneisses; amphibolites; metagreywackes; orthogneisses; sedimentary rocks; clastics; iron formations; conglomerates; greywackes; mudstones; structural features; faults; folds; shear zones; textures; foliation; gneissosity; tectonic history; tectonic interpretations; intrusions; batholiths; plutons; basins; orogenesis; crystallization; metamorphism; deformation; lithogeochemistry; isotopic studies; samarium; neodymium; radiometric dating; uranium lead dating; mass spectrometer analysis; trace element analyses; major element analyses; mineral potential; mineral deposits; gold; volcanogenic deposits; sulphide deposits; magmatic deposits; nickel; copper; diamond; mineral occurrences; lineations; Archean; Chipewyan-Wathaman Batholith; Churchill River Assemblage; Turtle Island Complex; Northern Indian Lake Pluton; Manikewan Ocean; Pukatawakan Bay Assemblage; Partridge Breast Lake Assemblage; Strawberry Island Assemblage; Whyme Bay Assemblage; Sickle Group; Lynn Lake Belt; Thorsteinson Lake Pluton; Mackenzie Dykes; South Bay Pegmatite Field; Paleoproterozoic; Mesoproterozoic; platinum group elements; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; tables; photographs; plots; ternary diagrams; bar graphs; Concordia diagrams; index maps
ProgramGEM2: Geo-mapping for Energy and Minerals Hudson/Ungava Core Zone
Released2019 05 21
AbstractThe Southern Indian Lake project covers an extensive area of more than 3500 km2 in north-central Manitoba. Field mapping took place between 2008 and 2016, and involved regional-scale geological mapping (1:50 000), sampling, and lithogeochemical, isotopic and geochronological studies of supracrustal and plutonic rocks. The northern portion of Southern Indian Lake, as well as Northern Indian, Gauer and Thorsteinson lakes, are dominated by granitoid bodies of different ages, including exposures of the Chipewyan-Wathaman batholith. The central portion of Southern Indian Lake, as well as Pine and Partridge Breast lakes, are dominated by supracrustal rocks.
Rock units were grouped according to their lithogeochemical and isotopic characteristics, as well as temporal affinities. Five different assemblages of supracrustal rocks, as well as different ages of plutonism, were identified and characterized. The oldest rocks are granodiorite gneiss dated at ca. 2520 Ma and interpreted to represent basement rocks for the Southern Indian domain. The Churchill River assemblage is composed of juvenile pillow basalt with intervening clastic sedimentary rocks, interpreted to be a relic of the Manikewan ocean or, alternatively, a back-arc basin of a juvenile oceanic arc. The Pukatawakan Bay assemblage, bracketed between ca. 1988 and 1890 Ma, consists mainly of massive to pillowed, juvenile metabasaltic rocks and associated basinal metasedimentary rocks. The Partridge Breast Lake assemblage is dominated by bimodal continental-arc volcanic and volcaniclastic rocks associated with basinal metasedimentary rocks, and is intruded by the ca. 1860-1855 Ma Chipewyan-Wathaman batholith. The Strawberry Island assemblage is interpreted to have been deposited in a foreland or molasse-type basin environment during a period of about 11 m.y. The youngest sequence of supracrustal rocks identified in the study area, the Whyme Bay assemblage, is characterized by fluvial-alluvial orogenic sediments that unconformably overlie the Strawberry Island assemblage. The Whyme Bay assemblage has temporal links to the Sickle Group arkosic rocks in the Lynn Lake belt. A variety of granitoid rocks, dominantly monzogranite and granodiorite in composition and ca. 1896 to 1829 Ma in age, are found throughout the Southern Indian Lake area. Intermediate and mafic intrusions of similar ages are also present but less common. The youngest intrusions recorded in the vicinity of the map area are beryl-columbite pegmatites from the South Bay pegmatite group, with an interpreted crystallization age of ca. 1773 Ma.
The Southern Indian Lake area has seen little exploration activity in the last several decades, but recent work revealed a high potential for a variety of mineral deposits, including Homestake-type iron-formation Au, intrusion-related Au systems, volcanogenic massive sulphide, magmatic Ni-Cu-platinum-group elements (PGE), and diamonds. Follow-up work should be considered to properly evaluate the economical potential of this area of Manitoba.
Summary(Plain Language Summary, not published)
This report contains new data and field observations on the geology of the Southern Indian Lake in northern Manitoba. This is a Government of Manitoba Geological Survey publication in which NRCan geologists are co-authors. It discusses the geological history and mineral potential of the region.

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