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Abstract <p>Geochronological studies of zircons from rare-metal granites of the Verkhnekundus Nb‒Ta and REE deposit located on the southwestern flank of Tuva-Mongolian massif are carried out. The age of 295&#xa0;±&#xa0;4&#xa0;Ma is obtained, that is in good agreement with the age of other alkaline rocks in this region, rare-metal granites of the Ulug-Tanzek deposit. The isotopic studies show the similarity of the Nd isotopic compositions of the rocks from the Verkhnekundus and Ulug-Tanzek deposits. Considering the isotope characteristics of the rocks from the Sangilen block, corresponding to the Mesoproterozoic crust, it is concluded that the rare-metal granites were formed with the participation of juvenile material.</p>

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Ulug-Tanzek Rare-Metal Igneous Complex and Its Occurrence in the Structures of Sangilen (the Southwestern Flank of the Tuva-Mongolian Superterrane)

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • A. V. Nikiforov,
  • A. A. Ivanova,
  • N. A. Polyakov,
  • E. B. Salnikova,
  • V. M. Savatenkov,
  • Y. V. Plotkina

摘要

Abstract

Geochronological studies of zircons from rare-metal granites of the Verkhnekundus Nb‒Ta and REE deposit located on the southwestern flank of Tuva-Mongolian massif are carried out. The age of 295 ± 4 Ma is obtained, that is in good agreement with the age of other alkaline rocks in this region, rare-metal granites of the Ulug-Tanzek deposit. The isotopic studies show the similarity of the Nd isotopic compositions of the rocks from the Verkhnekundus and Ulug-Tanzek deposits. Considering the isotope characteristics of the rocks from the Sangilen block, corresponding to the Mesoproterozoic crust, it is concluded that the rare-metal granites were formed with the participation of juvenile material.