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TitlePhysical features indicating the glacial transport distance of gahnite from the Izok Lake Cu-Zn-Pb-Ag VMS deposit, Nunavut
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMcClenaghan, M BORCID logo; Holmes, D R S; Averill, S A; Paulen, R CORCID logo; Layton-Matthews, D
SourceGeological Survey of Canada, Open File 7603, 2014, 15 pages, Open Access logo 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
File formatreadme
File formatrtf; pdf; xls
AreaIzok Lake
Lat/Long WENS-112.5000 -112.0000 65.7500 65.5000
Subjectssurficial geology/geomorphology; economic geology; gahnite; indicator elements; drift prospecting; drift deposits; ice transport directions; ice movement directions; tills; till analyses; till deposits; volcanogenic deposits; sulphide deposits; sulphides; glacial deposits; mineralization; zinc; copper; lead; silver; chalcopyrite; sphalerite; pyrrhotite; Cenozoic; Quaternary
Illustrationslocation maps; photomicrographs; tables
ProgramGEM: Geo-mapping for Energy and Minerals GEM Tri-Territorial information management & databases (Tri-Territorial Indicator Minerals Framework)
Released2014 05 12 (13:00)
AbstractThis small study of gahnite from the Izok Lake deposit and associated glacial dispersal train northwest of the deposit is the first to evaluate and report on the shape and surface characteristics of gahnite in glacial sediments. It demonstrates that increased distance of glacial transport results in: 1) a significant decrease in the proportion of attached quartz and muscovite on individual gahnite grains; 2) no discernable wear on the actual gahnite grains; 3) a significant decrease in the number of gahnite grains in till; and, 4) reduced grain sizes. Further work is recommended on other gahnite glacial dispersal trains to confirm and refine the proposed classification system and, in particular, to determine the distances at which a) none, and b) all, of the gahnite grain are completely free of quartz and muscovite. Future studies should ideally include only till samples where gahnite populations have been picked to completion, and no grains have yet been removed for other uses such as EMP analysis, in order to avoid any bias. In samples with very large gahnite populations, a split should be picked to completion rather than trying to pick a representative population of grains from the entire sample. Whereas quartz and muscovite are universal gahnite associates in all of the significant gahnite glacial dispersal trains that Overburden Drilling Management Limited has examined to date, other minerals such as spessartine may occur in sufficient concentrations in some metamorphosed VMS alteration zones to be in direct contact with gahnite and thus potentially to adhere to some of the dispersed grains.
Summary(Plain Language Summary, not published)
This open file reports data on the shape and surface textures of the metamorphic mineral gahnite (Zn spinel) in glacial sediments. This new information can be used to determine the relative distance of glacial transport gahnite has undergone, and will be useful to those exploring for volcanogenic massive sulphide deposits using indicator mineral methods.

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