PIXE analysis of contrasting fluid inclusion types in intrusion-related gold systems of the Tintina Gold Province, Yukon, Alaska

Abstract

The chemistry of fluid inclusions in shallow (coexisting brine and carbon dioxide-bearing vapour inclusions) and deep (low salinity carbon dioxide±methane-rich aqueous fluids) intrusion-related gold systems in the Tintina Gold Belt, Alaska and Yukon, has been measured using proton induced x-ray emission (PIXE) in order to compare and contrast these different fluid types. Both the high and low salinity fluid inclusions have high K/Ca ratios (> 1) consistent with granite-derived or granite equilibrated fluids, and low Mn/Fe ratios (< 0.24) consistent with the reduced conditions in which the ore systems formed. Fluid inclusions in the shallow level deposits are characterized by higher base meta..