Re-Os SYSTEMATICS OF LOLLINGITE AND ARSENOPYRITE IN GRANULITE-FACIES GARNET ROCKS: INSIGHTS INTO THE METAMORPHIC HISTORY AND THERMAL EVOLUTION OF THE BROKEN HILL BLOCK DURING THE EARLY MESOPROTEROZOIC (NEW SOUTH WALES, AUSTRALIA)

摘要

Lollingite and arsenopyrite aggregates occur in spessartine-almandine garnet rocks (garnetite) metamorphosed to granulite facies, which are spatially associated with Pb-Zn-Ag mineralization in the giant Broken Hill deposit, southern Curnamona Province, New South Wales, Australia. Sulfarsenide and sulfide minerals comprise lollingite and coexisting arsenopyrite +/- galena +/- tetrahedrite that occur interstitial to garnet crystals. Lollingite formed first while gold-bearing lollingite, which occurs as rare relicts in arsenopyrite, was destroyed to produce arsenopyrite +/- detectable micro-inclusions of invisible gold.