Relation of fluid inclusion geochemistry to wallrock alteration and lithogeochemical zonation at the Hollinger-McIntyre gold deposit, Timmins, Ontario, Canada.

Zonation patterns are well developed in the mafic metavolcanic rocks that host this epigenetic quartz-carbonate-gold mineralisation. Carbonate alteration assemblages are strongly zoned about mineralisation. Proceeding inward from background greenschist facies rocks to alteration envelopes enclosing individual veins four assemblages occur. Lithogeochemical zoning is equally well developed as variations in whole-rock abundances of As, Au, Ba, Rb and Sb. Gas chromatographic analyses of fluid inclusions in the quartz-carbonate veins indicate that the mineralising fluid was an H2O-CO2 mixture. Locally, CH4- rich fluid inclusions are associated with graphic and/or carbonaceous wallrocks. The observed zoning of the carbonate alteration assemblages is a result of the addition of CO2 to the wallrock which is consistent with the zoning of CO2 in the fluid inclusions.
Zonation patterns are well developed in the mafic metavolcanic rocks that host this epigenetic quartz-carbonate-gold mineralisation. Carbonate alteration assemblages are strongly zoned about mineralisation. Proceeding inward from background greenschist facies rocks to alteration envelopes enclosing individual veins four assemblages occur. Lithogeochemical zoning is equally well developed as variations in whole-rock abundances of As, Au, Ba, Rb and Sb. Gas chromatographic analyses of fluid inclusions in the quartz-carbonate veins indicate that the mineralising fluid was an H2O-CO2 mixture. Locally, CH4- rich fluid inclusions are associated with graphic and/or carbonaceous wallrocks. The observed zoning of the carbonate alteration assemblages is a result of the addition of CO2 to the wallrock which is consistent with the zoning of CO2 in the fluid inclusions.