Magnetite-apatite-dolomitic rocks of Ust-Chulman (Aldan shield, Russia): Seligdar-type carbonatites?
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The Ust-Chulman apatite ore body is situated within the Nimnyrskaya apatite zone at the Aldan shield in Russia. The latest data confirm the carbonatitic origin of the Seligdar apatite deposit (Prokopyev et al. in Ore Geol Rev 81:296–308, 2017). The results of our investigations demonstrate that the magnetite-apatite-dolomitic rocks of the Ust-Chulman are highly similar to Seligdar-type dolomitic carbonatites in terms of the mineralogy and the fluid regime of formation. The ilmenite and spinel mineral phases occur as solid solutions with magnetite, and support the magmatic origin of the Ust-Chulman ores. The chemical composition of REE- and SO3-bearing apatite crystals and, specifically, monazite-(Ce) mineralisation and the formation of Nb-rutile, late hydrothermal sulphate minerals (barite, anhydrite) and haematite are typical for carbonatite complexes. The fluid inclusions study revealed similarities to the evolutionary trend of the Seligdar carbonatites that included changes of the hydrothermal solutions from highly concentrated chloride to medium–low concentrated chloride-sulphate and oxidized carbonate-ferrous.
KeywordsMineralogy Fluid inclusion study Dolomitic carbonatites Ust-Chulman Seligdar deposit Nimnyrskaya apatite zone Aldan shield Yakutia
We are grateful to geologists A.V. Minakov from “Yakutskgeologiya” company, A.A. Kravchenko and A.I. Ivanov from Diamond and Precious Metal Geology Institute, SB RAS for the field work organisation. The authors gratefully thank Dr. Maarten A.T.M. Broekmans and Prof. Dogan Paktunc for editorial handling and comments and Prof. Franco Pirajno for reviewing the manuscript, which led to a significant improvement. Mineralogical studies were supported by the grant of the Russian Science Foundation No. 15-17-20036, the study of fluid inclusions was carried out according to the research project of the IGM SB RAS No. 0330-2016-0002. This work was supported by the Russian Science Foundation (RSF), grant # 15-17-20036.
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