GEOSCAN, résultats de la recherche


TitreFingerprinting volcanogenic massive sulfide deposits using magnetite chemistry: Application to till from Izok Lake, Nunavut, Canada
AuteurMakvandi, S; Beaudoin, G; Ghasemzadeh-Barvarz, M; McClenaghan, B
Source12th Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting, abstracts; 2013 p. 1
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130512
Réunion12th Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting; Uppsala; SE; août 12-15, 2013
Mediapapier; en ligne; numérique
Lat/Long OENS-112.5000 -112.0000 65.7500 65.5000
Sujetsmagnetite; éléments d'indice; exploration de dépôts glaciaires; dépôts glaciaires; directions du transport de la glace; directions des mouvements de la glace; tills; géochimie du till; analyses de till; dépôts de till; gîtes volcanogènes; gîtes sulfureux; sulfures; dépôts glaciaires; minéralisation; zinc; cuivre; plomb; argent; géologie des dépôts meubles/géomorphologie; géologie économique; Cénozoïque; Quaternaire
ProgrammeBases de données couvrant les trois territoires (minéraux indicateurs), GEM : La géocartographie de l'énergie et des minéraux
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
Magnetite is a useful indicator mineral for exploration because 1) its chemical composition is determined by the geological environment of formation; 2) It has widespread distribution in a variety of geological settings, and 3) It can be easily recovered from sample media. This study uses the chemistry of detrital magnetite to assess if magnetite can be related to different types of mineralization or hydrothermal alteration. At the Izok Lake District (ILD), magnetite from massive sulfide lenses, alteration zones, host rock, and till, both up- and down-ice flow, was sampled. The chemical composition of magnetite was measured by Electron Probe Micro Analysis (EPMA) and Laser Ablation-Inductively Coupled Plasma- Mass Spectrometry (LA-ICP-MS). Based on the results, the concentration of pathfinder elements (P, Pb, W, Sn, Cu, Mg, Co & Zn) increases in detrital magnetite with proximity to the ore zone, from the farthest till sample sites. Multivariate statistical methods were used to discriminate magnetite derived from different lithologies. Statistical analysis shows that magnetite from massive sulfides, hostrock gahnite-rich dacite, local gabbro, and iron formations can be distinguished using principal component analysis. Magnetite grains from till samples down-ice show similar chemical signature to that in the Izok Lake sulfide lenses and related alteration zones.