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TitleTrace element composition of iron oxides from IOCG and IOA deposits, and relationships to hydrothermal alteration and deposit subtypes
AuthorHuang, X W; Beaudoin, G; Makvandi, S; Boutroy, E; Corriveau, L; De Toni, A F
SourceProceedings of the 14th SGA Biennial Meeting; vol. 3, 2017 p. 931-934
LinksOnline - En ligne
Year2017
Alt SeriesEarth Sciences Sector, Contribution Series 20160425
PublisherSociety for Geology Applied to Mineral Deposits (SGA)
Meeting14th SGA Biennial Meeting; Quebec city; CA; August 20-23, 2017
Lang.English
Mediapaper; on-line; digital
File formatpdf
AreaBrazil; Australia; Chile; Canada
Subjectstrace element analyses; trace element geochemistry; iron oxides; copper; gold; hydrothermal alteration; hydrothermal deposits; hematite; iron-oxide-copper-gold (IOCG); iron oxide-apatite (IOA)
Illustrationsplots
ProgramUranium Ore Systems, Targeted Geoscience Initiative (TGI-4)
AbstractEPMA and LA-ICP-MS trace elemental data of magnetite and hematite from fourteen well-studied iron oxide¿copper¿gold (IOCG) and iron oxide¿apatite (IOA) deposits are used to test the relationships between trace element geochemistry and their host alteration types and deposit subtypes. The data furthers the development of discrimination diagrams. Iron oxides from high temperature Ca-Fe alteration facies are relatively rich in Mg, Ti, Co, V, and Ni, whereas those from high temperature K-Fe facies are rich in Mn and Cr. Those from low temperature K-Fe facies have relatively high Si, Ca, Y, Pb, Zr, Ge, W, Sn, Ta, Nb, Cu, and Mo. The consistency of the relative enrichment of specific elements in iron oxides with that in altered rocks indicates that iron oxide geochemistry can serve as a proxy of hydrothermal alteration types. Iron oxides from magnetite IOCG deposits have relatively high Ga, Mn, Zn, Ni, and Cr, a signature distinct from those from hematite IOCG deposits. Iron oxides from magnetite IOA deposits show relatively high Hf, Mg, Zn, Ni, Co, and V, whereas those from magnetite + hematite IOA deposits contain high W, Sc, and Ti. Plots of Si+Ca vs. Mn+Cr, Mn+V and Mn+Mg+V+Ni are proposed to discriminate different alteration and deposit subtypes.
Summary(Plain Language Summary, not published)
This research of Laval University colleagues to which the Geological Survey of Canada collaborates aims to establish relationships between trace element chemistry of magnetite and host alteration types and deposit subtypes to develop discrimination diagrams for mineral exploration and process studies. Iron oxides from magnetite-group iron oxide copper-gold (IOCG) deposits have relatively high Ga, Mn, Zn, Ni, and Cr, a signature distinct from those from hematite-group IOCG deposits. Iron oxides from magnetite-rich iron oxide-apatite (IOA) deposits show relatively high Hf, Mg, Zn, Ni, Co, and V, whereas those from magnetite + hematite IOA deposits contain high W, Sc, and Ti. Mineral chemistry plots of Si+Ca vs. Mn+Cr, Mn+V and Mn+Mg+V+Ni in iron oxides are proposed to discriminate different alteration and deposit subtypes.
GEOSCAN ID299857