The first data on the age of spodumene pegmatites from the kolatan deposit (Nuristan province, Afghanistan) based on U–Pb (ID-TIMS) dating of columbite

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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 fills cracks in previously formed minerals. The obtained U–Pb age of columbite-(Mn) is 18.35±0.08 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.

作者简介

N. Sergeeva

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

St. Petersburg, Russia

N. Rizvanova

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

St. Petersburg, Russia

A. Yosufzai

Empress Catherine II Saint Petersburg Mining University; Kabul Polytechnic University

St. Petersburg, Russia; Kabul, Afghanistan

A. Kuznetsov

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

St. Petersburg, Russia

S. Skublov

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences; Empress Catherine II Saint Petersburg Mining University

Email: skublov@yandex.ru
St. Petersburg, Russia; St. Petersburg, Russia

O. Galankina

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

St. Petersburg, Russia

A. Evdokimov

Empress Catherine II Saint Petersburg Mining University

St. Petersburg, Russia

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