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Abstract <p>For the first time, the U–Pb age of columbite-(Mn) from the spodumene pegmatites from the Kolatan deposit, located in Nuristan province, Afghanistan, was determined using the isotope dilution-thermal ionization mass spectrometry (ID-TIMS) method. Columbite-tantalite crystals have a zonal structure, while the rims are enriched in Ta by 2 times, compared with Nb. The ore generations were formed at the magmatic stage of the formation of rare-metal pegmatites, and then during the development of secondary veinlets of high-Nb columbite-(Mn). Nb deficiency at the final (hydrothermal?) stage has led to the crystallization of tantalite-(Mn), which fills fractures in previously formed minerals. The obtained U–Pb age of columbite-(Mn) is 18.35 ± 0.08 Ma. It is the first result of direct dating of ore minerals from rare-metal pegmatites of the Nuristan province, Afghanistan, by the ID-TIMS method. This age is consistent with the activation of Alpine orogenic processes in the Pamir–Himalayan belt and the formation of pegmatite-bearing granites of the Hindu Kush.</p>

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The First Data on the Age of Spodumene Pegmatites from the Kolatan Deposit (Nuristan Province, Afganistan) on the Basis of U–Pb (ID-TIMS) Dating of Columbite

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • N. A. Sergeeva,
  • N. G. Rizvanova,
  • A. Yosufzai,
  • A. B. Kuznetsov,
  • S. G. Skublov,
  • O. L. Galankina,
  • A. N. Evdokimov

摘要

Abstract

For the first time, the U–Pb age of columbite-(Mn) from the spodumene pegmatites from the Kolatan deposit, located in Nuristan province, Afghanistan, was determined using the isotope dilution-thermal ionization mass spectrometry (ID-TIMS) method. Columbite-tantalite crystals have a zonal structure, while the rims are enriched in Ta by 2 times, compared with Nb. The ore generations were formed at the magmatic stage of the formation of rare-metal pegmatites, and then during the development of secondary veinlets of high-Nb columbite-(Mn). Nb deficiency at the final (hydrothermal?) stage has led to the crystallization of tantalite-(Mn), which fills fractures in previously formed minerals. The obtained U–Pb age of columbite-(Mn) is 18.35 ± 0.08 Ma. It is the first result of direct dating of ore minerals from rare-metal pegmatites of the Nuristan province, Afghanistan, by the ID-TIMS method. This age is consistent with the activation of Alpine orogenic processes in the Pamir–Himalayan belt and the formation of pegmatite-bearing granites of the Hindu Kush.