THE FIRST DATA ABOUT U–Pb (ID-TIMS) AGE OF COLUMBITE FROM THE SPODUMENE PEGMATITE DEPOSIT OF KOLATAN (NURISTAN PROVINCE, AFGHANISTAN)

Nadezhda Sergeeva; Сергеева Надежда Александровна; Nailya Rizvanova; Ризванова Наиля Гаптрахмановна; Ataulla Yosufzai; Юсуфзай Атаулла; Anton Kuznetsov; Кузнецов Антон Борисович; Sergey Skublov; Скублов Сергей Геннадьевич; Olga Galankina; Галанкина Ольга Леонидовна; Aleksandr Evdokimov; Евдокимов Александр Николаевич

THE FIRST DATA ABOUT U–Pb (ID-TIMS) AGE OF COLUMBITE FROM THE SPODUMENE PEGMATITE DEPOSIT OF KOLATAN (NURISTAN PROVINCE, AFGHANISTAN)

Authors: Sergeeva N., Rizvanova N., Yosufzai A., Kuznetsov A., Skublov S.¹, Galankina O.¹, Evdokimov A.¹
Affiliations:
1. Институт геологии и геохронологии докембрия РАН
Section: GEOLOGY OF ORE DEPOSITS
Submitted: 07.02.2025
Accepted: 17.03.2025
Published: 11.06.2025
URL: https://bakhtiniada.ru/2686-7397/article/view/279171
ID: 279171

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Abstract

For the first time, the U-Pb age of columbite-(Mn) from the spodumene pegmatite deposit of Kolatan located in Nuristan province, Afghanistan, was determined using the isotopic dilution method (ID-TIMS). Columbite-tantalite crystals have a zonal structure, while the rims are enriched in Ta by 2 times, compared with Nb. The formation of ore generations took place at the magmatic stage of the formation of rare-metal pegmatites, and then during the development of secondary veins of high-Nb columbite-(Mn). Nb deficiency at the final (hydrothermal?) stage led to the crystallization of tantalite-(Mn), which performs cracks in previously formed minerals. The obtained U-Pb age of columbite-(Mn) is 18.35±0.05 Ma and 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.