Platinum-group element (PGE) mineralization associated with the Sudbury Igneous Complex (SIC), Canada, generally occurs within brecciated footwall rocks. At the Crean Hill and Vermilion deposits, variations in the ore mineralogy, textures, and whole rock geochemical signatures suggest that PGE deposition involved three stages. During the magmatic stage, sulfide melts were segregated at the base of the SIC and infiltrated the footwall rocks to form sulfide(-PGE) breccia and disseminated PGE mineralization (Crean Hill), and sulfide-PGE veins (Vermilion). Sulfide fractionation is suggested by the disappearance of Ru-bearing michenerite, a decrease in Ru, Rh and Ir tenors, and an increase in Pt, Pd and Au tenors and Cu/Ni away from the SIC contact. The syn-tectonic remobilization stage occurred between ~ 480–550 °C, as suggested by the composition of shear-hosted gersdorffite. At Crean Hill, Pd and Au were decoupled from Pt and remobilized via fluids into the footwall rocks, resulting in Pd and Au enrichment as disseminated michenerite and argentian gold along shear zones. At Vermilion, higher fluid-rock ratios and metamorphic semi-metal melts caused extensive remobilization of Pt, Pd and Au, and deposition of complex telluride, antimonide and arsenide grains within shear zones. A late metasomatic stage at < 300 °C (gersdorffite composition) is observed at Vermilion only, where it caused epidote-albite-quartz-calcite alteration of the SIC rocks and deposition of low-temperature sulfides and precious metals in veins crosscutting shear zones. Together, these findings demonstrate how PGE mineralization should be examined relative to its host rock geology and evolution to resolve the distribution of precious metals in modified Ni-Cu-PGE deposits.

与加拿大萨德伯里火成岩杂岩体 (SIC) 相关的铂族元素 (PGE) 矿化通常发生在角砾状下盘岩石中。在 Crean Hill 和 Vermilion 矿床中，矿石矿物学、结构和全岩地球化学特征的变化表明 PGE 沉积涉及三个阶段。在岩浆阶段，硫化物熔体在 SIC 底部偏析并渗透下盘岩石，形成硫化物 (-PGE) 角砾岩和浸染状 PGE 矿化 (Crean Hill) 和硫化物 -PGE 矿脉 (Vermilion)。含钌云云石的消失、Ru、Rh 和 Ir 元素的减少以及远离 SIC 接触的 Pt、Pd 和 Au 元素以及 Cu/Ni 的增加表明硫化物分馏。同构造再活化阶段发生在约 480–550 °C 之间，正如剪切承载的葛根辉石的成分所表明的那样。在 Crean Hill，Pd 和 Au 与 Pt 解耦，并通过流体重新流动到下盘岩石中，导致 Pd 和 Au 富集为沿着剪切带的浸染性云云石和阿根廷金。在朱红，较高的流体-岩石比率和变质半金属熔体导致铂、钯和金的广泛再活动，以及复杂的碲化物、锑化物和砷化物颗粒在剪切带内的沉积。仅在 Vermilion 观察到 < 300 °C 的晚期交代阶段（gersdorffite 成分），导致 SIC 岩石发生绿帘石-钠长石-石英-方解石蚀变，并在矿脉横切剪切带中沉积低温硫化物和贵金属。总之，这些发现证明了如何相对于其母岩地质和演化来检查 PGE 矿化，以解决改性 Ni-Cu-PGE 矿床中贵金属的分布问题。