PGE distribution in the metalliferous black slates of the Okcheon Metamorphic Belt, South Korea

Abstract

Chinese Ni-Mo sulfide ores. Chondrite-normalized PGE pattern for the coaly slates displays a strong positive Ru anomaly and slightly negative Pt anomaly. The Zn-rich shale of Czech and the black shale of South China show similar patterns to the coaly slates except its slightly enriched Au and positive Pt anomaly, respectively. Positive correlations of organic carbon and the redox-sensitive trace elements such as U, V and Mo with PGEs concentrations in the coaly slates suggest that the PGEs were most likely introduced by submarine hydrothermal activity and precipitated with organic matters under anoxic environment. In general, the metalliferous black slates in the OMB seem to be metamorphosed analogue of the Early Cambrian black shales of the South China Block in the former continental back-arc basin setting, which host metalliferous Ni-Mo-PGE sulfide ores.