Sulfur isotope data and the nature of the hydrothermal systems at the Panguna and Frieda porphyry copper deposits, Papua New Guinea

Univ. Tasmania, Geol. Dep., Hobart, Australia

58 anhydrite and sulfide specimens. Individual minerals have the following ranges: at Panguna, pyrite, 0.5 to 3.1 per mil, galena; -1.5 per mil, sphalerite; -1.0 to +1.6 per mil, anhydrite; 7.6 to 1.6 per mil; at Frieda, sulfides coexisting with anhydrite, -3.5 to +1.9 per mil; pyrites without anhydrite, -1.6 to +2.1 per mil; anhydrite, 10.0 to 18.3 per mil. Temperature ranges are 416 degrees to 877 degrees C at Panguna and 356 degrees to 677 degrees C at Frieda. Isotopic equilibrium seems likely. Fluid inclusion data indicate that copper mineralization at Frieda was associated with boiling salt-rich liquid at temperatures of 420 degrees to >580 degrees C, and pressures of 150 to 250 bars.--Modified journal abstract.

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