The geology of the Walparuta and Ethiudna Mine areas, Olary Province, South Australia.

Abstract

The two areas mapped contain Adelaidean metasediments overlying Precambrian basement rocks. Three phases of deformation are identified: the first accompanied by high grade metamorphism accompanied by widespread migmatization and intrusion of granites; the second with less extreme pressure-temperature conditions; and the third with green schist facies metamorphism.Small copper occurrences are quite common in the region, and in the basement they appear to fall into two distinct categories. (1) Those associated with the calc-silicate rocks, and (2) Those associated with shears or breccias. Marker horizons were sometimes found useful in delineating major structure, although small scale folds were not much use in this respect