Mineralogy of phoscorites of the arbarastakh complex (Republic of Sakha, Yakutia, Russia)

Mikhail Nikolaevich Kruk, Anna Gennadievna Doroshkevich, Ilya Romanovich Prokopyev, Ivan Aleksandrovich Izbrodin

Research output: Contribution to journalArticlepeer-review

Abstract

The Arbarastakh ultramafic carbonatite complex is located in the southwestern part of the Siberian Craton and contains ore-bearing carbonatites and phoscorites with Zr-Nb-REE mineralization. Based on the modal composition, textural features, and chemical compositions of minerals, the phoscorites from Arbarastakh can be subdivided into two groups: FOS 1 and FOS 2. FOS 1 contains the primary minerals olivine, magnetite with isomorphic Ti impurities, phlogopite replaced by tetraferriphlogopite along the rims, and apatite poorly enriched in REE. Baddeleyite predominates among the accessory minerals in FOS 1. Zirconolite enriched with REE and Nb and pyrochlore are found in smaller quantities. FOS 2 has a similar mineral composition but contains much less olivine, magnetite is enriched in Mg, and the phlogopite is enriched in Ba and Al. Of the accessory minerals, pyrochlore predominates and is enriched in Ta, Th, and U; baddeleyite is subordinate and enriched in Nb. Chemical and textural differences suggest that the phoscorites were formed by the sequential introduction of different portions of the melt. The melt that formed the FOS 1 was enriched in Zr and REE relative to the FOS 2 melt; the melt that formed the FOS 2 was enriched in Al, Ba, Nb, Ta, Th, U, and, to a lesser extent, Sr.

Original languageEnglish
Article number556
JournalMinerals
Volume11
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Aldan shield
  • Arbarastakh alkaline-ultrabasic carbonatite complex complex
  • Chemical evolution
  • Mineralogy
  • Phoscorites

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES
  • 1.05.GC GEOCHEMISTRY & GEOPHYSICS
  • 1.05.RE MINERALOGY

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