The Gold–Palladium Ozernoe Occurrence (Polar Urals, Russia): Mineralogy, Conditions of Formation, Sources of Ore Matter and Fluid

We studied the mineralization and sulfur isotopic composition of sulfides gold–palladium ores in olivine clinopyroxenites from Dzelyatyshor massif made up a continuous layered series rocks: olivine-free clinopyroxenite–olivine clinopyroxenite–wehrlite. The primary igneous layering rocks, manifested as different quantitative ratios clinopyroxene them, controls local trends variability chemistry mineral-forming medium concentrations ore components, including noble metals, each separate layer during its cooling. replacement rock-forming minerals by secondary minerals, when temperature decreases, is characteristic trend for pyroxenites: (a) → serpentine, magnetite, (b) amphibole, magnetite chlorite. deposition native gold parageneses with PGM at Ozernoe occurrence took place earlier This process completed mineral formation deposit temperatures 150–250 °C high activity S, Te, Sb, As fluid. conditions chloritization reflected change native-sulfide forms Pd arsenide-antimonide sulfides. content increases series—Au-Ag solid solution (<1.5 wt.% Pd)—Au-Cu intermetallides (to 6 Pd)—Cu-Au-Pd solutions (16.2–16.9 Pd). pyrite, chalcopyrite, bornite varies −2.1 to −2.9‰. It assumed that deep-seated magmatic basic melt was source fluid, sulfur.