Abstract
To gain further insight into the origin of Ru–Os sulfides, the first in-situ sulfur isotopic data for Ru–Os sulfides from different polyphase platinum-group mineral (PGM) assemblages derived from the Quaternary deposits of the Guli massif located in the Maimecha-Kotui province are presented. A number of analytical techniques, including electron microprobe analysis and laser ablation attached to multiple-collector inductively coupled-plasma mass-spectrometry, were utilized. Polyphase platinum-group mineral (PGM) assemblages are represented by two types: (1) osmium and iridium alloys associated with Ru–Os sulfides of the laurite (Ru,Os)S2–erlichmanite (Os,Ru)S2 solid solution series, cuproiridsite (CuIr2S4), and unnamed Os–Ir sulfide (Os,Ir)S2; (2) ferroan platinum containing inclusions of laurite, Ru–Os–Ir alloys, and other PGMs. These detrital PGM assemblages were sourced from different bedrocks. It is concluded that PGM assemblages of types 1 and 2 were derived from dunite/chromitite and clinopyroxenite, respectively. The sulfur isotope signatures of Ru–Os sulfides of type 1 (δ34S = 0.9 ± 0.4‰, n = 8) imply that sulfur derived from a subchondritic source. The slightly lighter δ34S values in type 2 laurite (δ34S = –1.7 ± 0.2‰, n = 10) are likely due to the evolved composition of the ore-forming fluid. Despite these differences, the S-isotope data are consistent with the origin of sulfur from a common near-chondritic source.
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ACKNOWLEDGMENTS
The authors are grateful to V.A. Bulatov, V.V. Khiller, and N.S. Chebykin for their assistance with mineralogical studies. The authors are also grateful to the anonymous reviewer for constructive comments that contributed to improvement of the manuscript.
Funding
This study was supported by the Russian Science Foundation, project no. 22-27-00140.
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Malitch, K.N., Kogarko, L.N., Badanina, I.Y. et al. Sulfur Isotope Composition of Ru–Os Sulfides from the Guli Massif, Maimecha-Kotui Province, Russia: First Results. Dokl. Earth Sc. 507, 1013–1019 (2022). https://doi.org/10.1134/S1028334X22600955
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DOI: https://doi.org/10.1134/S1028334X22600955