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TitlePaleoproterozoic iron oxide apatite (IOA) and iron oxide-copper-gold (IOCG) mineralization in the East Arm Basin, Northwest Territories, Canada
AuthorPotter, E GORCID logo; Corriveau, LORCID logo; Kjarsgaard, B AORCID logo
SourceCanadian Journal of Earth Sciences 2019 p. 1-17, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20150373
PublisherNRC Research Press
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
ProvinceNorthwest Territories
NTS75E/13; 75K/10; 75K/11; 75K/12; 75K/13; 75K/14; 75K/15; 75L/03; 75L/04; 75L/05; 75L/06; 75L/07; 75L/08; 75L/09; 75L/10; 75L/11; 75L/12; 75L/14; 75L/15; 75L/16; 85H/06; 85H/07; 85H/09; 85H/10; 85H/11; 85H/14; 85H/15; 85H/16; 85I/01; 85I/02; 85I/03; 85I/08
AreaGreat Slave Lake; East Arm; Thedene Nene National Park
Lat/Long WENS-113.5000 -108.7500 63.0000 61.5000
Subjectseconomic geology; regional geology; structural geology; geochemistry; geochronology; Science and Technology; Nature and Environment; mineral exploration; exploration guidelines; mineral deposits; polymetallic ores; iron oxides; apatite; copper; gold; vein deposits; uranium; ore mineral genesis; mineralization; mineral occurrences; tectonic setting; magmatism; intrusions; sills; emplacement; faulting; displacement; subduction zones; alteration; host rocks; bedrock geology; lithology; igneous rocks; intrusive rocks; volcanic rocks; andesites; basalts; trachybasalts; dacites; rhyolites; volcano-sedimentary strata; breccia zones; structural features; faults; geochemical analyses; trace element analyses; whole rock geochemistry; uraninite; electron microscope analyses; radiometric dates; zircon dates; East Arm Basin; Paleoproterozoic; Compton Intrusions; Pearson Formation; Great Bear Magmatic Zone; Great Bear Subduction Zone; Slave Craton; Great Slave Lake Shear Zone; Taltson Magmatic-Tectonic Zone; Churchill Province; Great Slave Supergroup; Christie Bay Group; Seton Formation; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; tables; models; stratigraphic columns; geochronological charts; photographs; photomicrographs; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-4) Uranium Ore Systems
Released2019 03 14
AbstractThe Paleoproterozoic East Arm Basin of Canada hosts polymetallic vein, iron oxide-apatite (IOA), and potential iron oxide-copper-gold (IOCG) mineral occurrences, mainly associated with a belt of ca. 1.87 Ga intermediate-composition sills termed the Compton intrusions. Advances in our knowledge of the East Arm Basin and of IOA and IOCG deposits within the broader context of iron oxide and alkali-calcic alteration systems enables a new regional analysis of this mineralization and facilitates comparison of these mineral occurrences and host rocks to the nearby Great Bear magmatic zone IOCG districts. The Compton intrusions and co-magmatic Pearson Formation volcanic rocks are comparable in age and composition to intrusive plus volcanic rocks of the Great Bear magmatic zone that host IOA-IOCG mineralization. Taking into account fault displacements, emplacement of Compton intrusions and Pearson Formation volcanic rocks are also consistent with the architecture of modern arcs, supporting a direct relationship with the Great Bear subduction zone. Trace element patterns of uraninite contained in IOA occurrences of the East Arm Basin are also similar to the patterns of uraninite from the Great Bear magmatic zone occurrences, consistent with both regions having experienced similar iron oxide and alkali-calcic alteration and mineralization. Our new results indicate that exploration for IOA, IOCG, and affiliated deposits in the East Arm Basin should focus on delineating increased potassic-iron alteration types and fault/breccia zones associated with these systems through field mapping and application of geochemical, radiometric, magnetic, and gravity surveys.
Summary(Plain Language Summary, not published)
A contribution of the IOCG/Multiple Metals - Great Bear Region and Northern Uranium for Canada projects of the Geomapping for Energy and Minerals (GEM) program and the Uranium Ore Systems project of the Targeted Geoscience Initiative Four (TGI-4) program, this manuscript outlines geological features in the underexplored East Arm Basin of Great Slave Lake that are similar to the Great Bear magmatic zone. This linkage is important, because the Great Bear magmatic zone is currently Canada's most prospective region for iron oxide-copper-gold and affiliated deposit types. The manuscript focuses on application of a unified genetic model to explain seemingly disparate mineral occurrences that may indicate the presence of larger, more prospective mineral occurrences. While the majority of the East Arm Basin is covered by the proposed Thaidene Nene National park reserve, the majority of the areas of interest defined in this report lie outside the proposed park boundaries.

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