GEOSCAN Search Results: Fastlink


TitleGeology, Montresor River area, Nunavut, parts of NTS 66-H and NTS 66-I
AuthorPercival, J A; Tschirhart, V; Davis, W J; Berman, R G; Ford, A
SourceGeological Survey of Canada, Canadian Geoscience Map 231, 2015, 1 sheet, (Open Access)
PublisherNatural Resources Canada
Maps1 map
Map Info.geological, bedrock and structural geology, 1:100,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 14 (NAD83)
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
File formatreadme
File formatpdf; rtf; shp; xml; xls
NTS66H/13; 66H/14; 66H/15; 66H/16; 66I/01; 66I/02; 66I/03; 66I/04; 66I/05; 66I/06; 66I/07; 66I/08
AreaBack River; Montresor River
Lat/Long WENS-98.0000 -96.1667 66.5000 65.8333
Subjectsstratigraphy; structural geology; bedrock geology; structural interpretations; mineral potential; sedimentary rocks; igneous rocks; tonalites; sandstones; siltstones; schists; dolostones; metamorphic rocks; granites; granodiorites; gneisses; structural features; metamorphism; breccias; intrusive rocks; Thelon Tectonic Zone; Rae craton; Montresor Belt; Montresor Group; Precambrian; Proterozoic
Illustrationstables; cross-sections
ProgramRae Province, Chantrey-Thelon, GEM2: Geo-mapping for Energy and Minerals
Released2015 12 22
AbstractThe Montresor River area (parts of NTS 66-H/13, 14, 15, 16, and NTS 66-I/1, 2, 3, 4, 5, 6, 7, 8), part of the Rae structural province, is underlain by granitic rocks of Archean (ca. 2.6 Ga) age and the Paleoproterozoic (<2.19 Ga) Montresor group of metasedimentary rocks. Quartzite, dolostone and metapelite of the lower Montresor group are structurally imbricated (D1) with granitic gneisses and metamorphosed to the amphibolite facies. This structural footwall complex is separated from greenschist-facies rocks of the upper Montresor group by a detachment fault (D2). A third set of structures including mylonites juxtaposes the basal footwall complex and surrounding granitoid rocks carrying concordant augen gneissic fabric. The Montresor syncline, outlined aeromagnetically by prominent magnetic siltstone beds, may be a D4 structure. Previously unrecognized breccia and hydrothermally altered alkaline igneous rocks occur as a stratabound layer in the southwestern Montresor syncline and have elevated Cu, Ag, Au values.
Summary(Plain Language Summary, not published)
As a contribution to the Rae project of the Geo-mapping for Energy and Minerals-2 Program, this map portrays the bedrock geology of the Montresor metasedimentary belt and its surroundings. New field, geophysical, petrological and geochronological observations indicate a complex structural history between 1.9 and 1.8 billion years ago, resulting in potential for polymetallic mineral deposits. A stratiform zone of hydrothermally altered alkaline intrusions and breccia may host disseminated copper-silver-gold mineralization.