Abstract
In the Mary Kathleen Fold Belt, in the centre of the Proterozoic Mt Isa Block, four phases of deformation‐related hydrothermal activity are recognized that occurred over a time range from at least 1750 Ma to 1100 Ma. Intense metasomatism occurred during all four phases due to the involvement of highly saline fluids, with the apparent NaCl source being the evaporitic Corella Formation rocks. In all phases, the scale over which the hydrothermal systems operated was ≥ 1 km, with commensurate time integrated fluid fluxes of the order of 104 m3/m2 or more. Phase 1 involved the development of convection cells and fault‐ and shear‐zone fluid pathways related to emplacement of intrusions in and above a major crustal subhorizontal extensional shear zone. Gold mineralization and some U‐REE mobilization occurred at this time. Intrusive rocks and contact aureoles formed discrete kilometre‐scale bodies within the Corella Formation during Phase 1. As a consequence, fluid flow during Phases 2 and 3 (regional deformation...
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