Sulfur isotope distribution in sulfides and sulfates from Broken Hill South, New South Wales

Sulfur isotope ratios determined in specimens of primary galena and sphalerite from the southern part of the Broken Hill silver-lead-zinc lode were similar to those found in secondary sulfates (mainly anglesite), with average delta S ³⁴ values of + 1.0 and + 0.7, respectively. Much higher delta S ³⁴ values, averaging --43.2, were found in supergene galena and sphalerite which occur chiefly in colloform masses in joints and cavities in theprimary ore to depths of as much as 1,520 feet.

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