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TitleOxygen isotope zonation about the Izok Ag-VMS deposit, Slave Province, Nunavut: hanging-wall vector to mineralization
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AuthorTaylor, B E; Peter, J M; Laakso, K; Rivard, B
SourceTargeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development; by Peter, J M (ed.); Mercier-Langevin, P (ed.); Geological Survey of Canada, Open File 7853, 2015 p. 27-44, https://doi.org/10.4095/296543 (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Peter, J M; Mercier-Langevin, P; (2015). Targeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development, Geological Survey of Canada, Open File 7853
File formatpdf
ProvinceNunavut
NTS86H/10
AreaIzok Lake
Lat/Long WENS-112.8333 -112.5000 65.8333 65.5000
Subjectseconomic geology; metallic minerals; Archean; volcanogenic deposits; sulphide deposits; alteration; metamorphism; mineral assemblages; mineralization; exploration guidelines; volcanic rocks; mineral deposits; gold; isotopes; oxygen isotopes; Precambrian
Illustrationslocation maps; plots; photographs; histograms; cross-sections
ProgramVolcanogenic Massive Sulfide Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2015 06 11
AbstractOxygen isotope compositions were determined for 99 whole-rock samples of felsic host rocks collected in the vicinity of the Izok volcanogenic massive sulphide deposit. The results reveal a distinct pattern of oxygen isotope zonation spatially centred over the massive sulphide lenses produced by water/rock reaction in a hydrothermal system. The zonation indicates that this paleo-hydrothermal system is relatively 'up right', centered over the massive sulphide lenses. Analyzed samples are primarily from the hanging wall, and have d18OV-SMOW values as high as 14.7perthousand. In contrast to isotopic studies describing 18O-depleted footwall and upflow zones, the 18O-enriched zoning pattern in the Izok Lake area illustrates a clear hanging-wall "vector" to the buried sulphide lenses. This isotopic 'fingerprint' of an Archean hydrothermal system has been retained in the rocks, despite subsequent amphibolite facies metamorphism. The isotopic zonation broadly corresponds to an isopleth indicating loss of Na2O from the rocks, and, to some extent, with a mapped distribution of the Ishikawa alteration index and short-wave infrared spectral mapping of white-mica and biotite+chlorite-related absorption features. However, the pattern of oxygen isotope zonation provides a more focused 'target'.
GEOSCAN ID296543