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TitleMultivariate statistical analysis of trace element compositions of native gold from orogenic gold deposits: implication for mineral exploration
AuthorLiu, H; Beaudoin, G; Makvandi, S; Jackson, S EORCID logo; Huang, XORCID logo
SourceOre Geology Reviews vol. 131, 104061, 2021 p. 1-17,
Alt SeriesNatural Resources Canada, Contribution Series 20200777
Mediapaper; on-line; digital
File formatpdf
Subjectseconomic geology; geochemistry; mineralogy; Science and Technology; Nature and Environment; mineral exploration; mineral deposits; gold, native; ore mineral genesis; crystallization; precipitation; electron probe analyses; mass spectrometer analysis; microscopic analyses; trace element geochemistry; statistical analyses; minor element geochemistry; inclusions; mineral associations; textures; gangue minerals; host rocks; paragenesis; hydrothermal systems; fluid flow
Illustrationslocation maps; histograms; photomicrographs; plots; schematic diagrams
Released2021 02 11
AbstractThe mineralogy and chemical composition of native gold from twenty-seven representative orogenic gold deposits were investigated using optical microscopy, electron probe microanalysis (EPMA), and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Minor elements, such as Ag and Cu, occur in solid solution, while trace elements, such as Fe, As, S, Hg, form impurities or micro inclusions in native gold. Partial least squares-discriminant analysis (PLS-DA) has identified compositional characteristics based on mineral association, gold texture and dominant country rocks. Gold grains are commonly associated with pyrite, arsenopyrite, chalcopyrite, pyrrhotite, and tourmaline in the studied orogenic deposits. Chemical variations in gold with different associated mineral assemblages are related to the partitioning of trace elements between co-crystalizing minerals and gold during precipitation. Gold inclusions in gangue minerals are discriminated from later gold in fractures based on contents of Ag, Fe, Pb, and Bi, which indicates that gold in different paragenetic stages of mineralization can be identified using its trace element signature. Gold hosted in different regional country rocks can be discriminated by Ag, Cu, Pd, Sb, and Hg, likely because of reactions of hydrothermal fluids with the regional country rocks along the fluid flow paths.

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