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TitreOxygen isotope zonation about the Izok Ag-VMS deposit, Slave Province, Nunavut: hanging-wall vector to mineralization
TéléchargerTéléchargement (publication entière)
AuteurTaylor, 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; par Peter, J M (éd.); Mercier-Langevin, P (éd.); Commission géologique du Canada, Dossier public 7853, 2015 p. 27-44,
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans 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, Commission géologique du Canada, Dossier public 7853
Lat/Long OENS-112.8333 -112.5000 65.8333 65.5000
SujetsArchéen; gîtes volcanogènes; gîtes sulfureux; altération; métamorphisme; assemblages de minéraux; minéralisation; directives d'exploration; roches volcaniques; gisements minéraux; or; isotopes; isotopes d'oxygène; géologie économique; minéraux métalliques; Précambrien
Illustrationslocation maps; plots; photographs; histograms; cross-sections
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Diffusé2015 06 11
Résumé(disponible en anglais seulement)
Oxygen 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'.