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자료유형
학술저널
저자정보
Dongbok Shin (Kongju National University) Sujeong Kim (Kongju National University)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.20 No.6
발행연도
2016.1
수록면
827 - 835 (9page)

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The concentration of platinum group elements (PGE) in metalliferous black slates in the Okcheon Metamorphic Belt (OMB), South Korea, was analyzed and compared to those in various metal-rich black shales worldwide. Coaly slates interbedded in black slates are more metalliferous and total PGE concentrations are higher in the coaly slates (avg. 63 ppb) than in the black slates (avg. 16 ppb). Pd and Ru are the most abundant PGE in the coaly slates and the black slates with concentration up to 68 ppb (avg. 34 ppb) and 18 ppb (avg. 10 ppb), respectively. The ratios of PGEs such as Pt/Pd, Pt/Pt*, Au/Ir and Ir/Pd in the coaly slates have similar characteristics to those in the Zn-rich shale of Czech and, a little less, the 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.

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