Magnetite-apatite-dolomitic rocks of Ust-Chulman (Aldan shield, Russia): Seligdar-type carbonatites?

Ilya R. Prokopyev, Anna G. Doroshkevich, Anna A. Redina, Andrey V. Obukhov

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)257-266
Number of pages10
JournalMineralogy and Petrology
Volume112
Issue number2
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • Aldan shield
  • Dolomitic carbonatites
  • Fluid inclusion study
  • Mineralogy
  • Nimnyrskaya apatite zone
  • Seligdar deposit
  • Ust-Chulman
  • Yakutia

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