Journal article

Timing of gold mineralization relative to the peak of metamorphism at Bronzewing, Western Australia

FL Elmer, R Powell, RW White, GN Phillips

ECONOMIC GEOLOGY | SOC ECONOMIC GEOLOGISTS, INC | Published : 2007

Abstract

The Bronzewing gold deposit is hosted within the middle to upper greenschist facies, tholeiitic metabasalt of the Yandal greenstone belt within the Archean Yilgarn craton. Gold mineralization at Bronzewing is surrounded by an alteration halo hundreds of meters in thickness, composed of distal chlorite, intermediate chlorite-calcite, and proximal carbonate-K-mica zones. Chlorite (in the distal zone) and muscovite and biotite (in the proximal zone) define a strong foliation that is locally crenulated, indicating that alteration minerals and K2O addition were produced prior to the crenulation event. Within the proximal alteration zone, biotite, ankerite, and calcite cut the crenulated foliation..

View full abstract