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TitleIndicator mineral signatures of magmatic Ni-Cu deposits, Thompson Nickel Belt, Manitoba: Part 1 - bedrock data
AuthorMcClenaghan, M B; Kjarsgaard, I M; Averill, S A; Layton-Matthews, D; Crabtree, D; Matile, G
SourceGeological Survey of Canada, Open File 6766, 2012, 43 pages, (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is related to McClenaghan, M B; Kjarsgaard, I M; Averill, S A; Layton-Matthews, D; Crabtree, D; Matile, G; McMartin, I; Pyne, M; (2013). Indicator mineral signatures of magmatic Ni-Cu deposits, Thompson Nickel Belt, Manitoba: Part 2 - till data, Geological Survey of Canada, Open File 7200
File formatreadme
File formatpdf; xls; doc; rtf
NTS63I; 63J; 63O; 63P
Lat/Long WENS-100.0000 -96.0000 56.0000 54.0000
Subjectsstratigraphy; surficial geology/geomorphology; structural geology; bedrock geology; indicator elements; electron probe analyses; mineralogical analyses; mineral occurrences; pentlandite; sperrylite; chalcopyrite; pyrrhotite; arsenopyrite; pyrite; sulphide deposits; gold; chromite; spinel; ilmenite; diopside; olivine; magmatic deposits; mineralization; ultramafic rocks; lithology; Thompson Nickel Belt; indicator minerals; Proterozoic; Precambrian
Illustrationstables; location maps; flow charts; photomicrographs; plots
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
Released2012 10 25
AbstractBedrock and till sampling around the Ni-Cu deposits in the northern Thompson Nickel Belt, Manitoba, was conducted by the Geological Survey of Canada in collaboration with the Canadian Mining Industry Research Organization and the Manitoba Geological Survey to document the types and compositions of minerals indicative of Ni-Cu mineralization in both mineralized bedrock and till. This report constitutes Part 1 of the reporting of indicator-mineral results from the study: bedrock samples. Bedrock samples used in this study were collected in 2005 and their compositional data were compared to published data from previous Thompson Nickel Belt studies. Potential indicator minerals were identified and characterized in both polished thin section and heavy mineral concentrates prepared from crushed bedrock samples. Pentlandite, Ni-bearing pyrrhotite, chalcopyrite, pyrite, and sperrylite are documented in the samples and are potential indicators of Ni-Cu mineralization, however these minerals are prone to physical abrasion and post-glacial weathering when eroded, transported, and deposited in till. Chalcopyrite and pentlandite are the most abundant ore minerals in till and are most abundant in pan concentrates (25-250 ?m) and the 0.25-0.5 mm fractions.
The most physically robust indicator mineral documented in the bedrock samples is Zn-rich (>2 wt.% ZnO) chromite to Cr-magnetite. These minerals were expected to be Zn-rich due to the high grades of metamorphism found in many of the Ni-Cu deposits within the Thompson Nickel Belt. Olivine, in association with mineralized rocks, has a restricted composition range >Fo78 and <3000 ppm Ni, making it another potential indicator mineral. Although abundant in till down ice of the Thompson Nickel Belt, Cr-diopside was not recovered from bedrock samples and its bedrock source remains to be identified.