Ключевые слова

2411-3336

2541-9404

Записки Горного института

Journal of Mining Institute

Санкт-Петербургский горный университет императрицы Екатерины ΙΙ

Empress Catherine II Saint Petersburg Mining University

SANBMI

pmi-16469

https://pmi.spmi.ru/pmi/article/view/16469

Геология

Geology

Geochemistry of spodumene from pegmatites of the Laghman granitoid complex, Afghanistan

Геохимия сподумена из пегматитов гранитоидного комплекса Лагман, Афганистан

Evdokimov

Aleksandr N.

Евдокимов

А. Н.

Evdokimov

Aleksandr N.

evdokimov_an@spmi.ru

0000-0002-8121-0426

Санкт-Петербургский горный университет императрицы Екатерины II (Санкт-Петербург, Россия) Empress Catherine II Saint Petersburg Mining University (Saint Petersburg, Russia)

Yosufzai

Ataullah

Юсуфзай

А.

Yosufzai

Ataullah

ata.yosufzai@kpu.edu.af

0000-0001-6549-4409

18 06 2025

2025

274 45 62 25 04 2024 28 01 2025 25 08 2025

2025

А. Н. Евдокимов, А. Юсуфзай

Aleksandr N. Evdokimov, Ataullah Yosufzai

Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0)

This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0)

https://pmi.spmi.ru/pmi/article/view/16469

Приведены первые данные о содержаниях редких элементов в составах сподумена из пегматитов гранитоидного комплекса Лагман в Восточном Афганистане, месторождений Колатан, Дигал, Гульсалак и Цамгал. Анализы были выполнены методом SIMS. Установлены парагенетические особенности сподумена, который в количестве 10-35 % присутствует в сподумен-микроклин-альбитовых, сподумен-альбитовых и сподумен-лепидолит-клевеландитовых пегматитах. Размер кристаллов от нескольких миллиметров до 1,5-2 м, иногда до 3 м в длину. Форма кристаллов призматическая, досковидная, прямоугольная. Содержания малых и редких элементов в сподумене значительно изменяются от центра к краю кристаллов. Увеличение содержаний Li (36571-51040), Na (378-1542), Mn (103-2877), Ga (24,4-90,1), Sn (5,52-382), Ti (1,3-79,5), Zn (0,37-38,4) ppm сопровождается уменьшением концентраций K (3,86-147), Ca (1,39-105), Mg (0,26-276), B (1,69-57,3), Cr (2,75-15,1), Cu (0,65-11,6), Cs (0,0-8,75), Be (0,03-9,54), Ta (0,03-2,09), Sr (0,03-3,09), V (0,07-3,11), Rb (0,02-1,56), Ba (0,03-3,17), Zr (0,01-1,6) ppm. Количество Fe уменьшается от центра к краю, а Mn и Sn увеличивается от центра к краю во всех кристаллах. В розовато-фиолетовой зоне кристалла содержание Mn значительно выше, чем Cr и Fe. Наблюдается положительная корреляция Li с Na, Mn, Fe, Ga, Sn, B, Cr, Ti, Be и отрицательная – с K, Cs, Ta и Nb. Сподумен из месторождения Дарай Печ содержит больше галлия, чем из месторождений Колатан и Цамгал, что имеет практическое значение. Резкие границы между зонами роста говорят о скорости диффузии, которая была меньше скорости роста кристаллов, происходившего в условиях кристаллизации пегматитового расплава. В результате обмена с остаточным расплавом осуществлялась незначительная посткристаллизационная диффузия и восстановление равновесия между кристаллом и окружающей средой.

The article presents the first data on the rare element contents in the compositions of spodumene from pegmatites of the Laghman granitoid complex in Eastern Afghanistan, the Kolatan, Digal, Gulsalak, and Tsamgal deposits. The analyses were performed by SIMS method. The paragenetic features of spodumene were determined. It is present in spodumene-microcline-albite, spodumene-albite, and spodumene-lepidolite-clevelandite pegmatites in amounts of 10-35 %. The crystals range in size from a few mm to 1.5-2 m, sometimes to 3 m long. The crystals are prismatic, board-shaped, and rectangular. The contents of minor and rare elements in spodumene vary significantly from the centre to the edge of the crystals. The increase in the contents of Li (36,571-51,040), Na (378-1542), Mn (103-2877), Ga (24.4-90.1), Sn (5.52-382), Ti (1.3-79.5), Zn (0.37-38.4) ppm is accompanied by a decrease in the concentrations of K (3.86-147), Ca (1.39-105), Mg (0.26-276), B (1.69-57.3), Cr (2.75-15.1), Cu (0.65-11.6), Cs (0.0-8.75), Be (0.03-9.54), Ta (0.03-2.09), Sr (0.03-3.09), V (0.07-3.11), Rb (0.02-1.56), Ba (0.03-3.17), Zr (0.01-1.6) ppm. The amount of Fe decreases from the centre to the edge, and Mn and Sn increase from the centre to the edge in all crystals. In the pinkish-violet zone of the crystal, Mn content is significantly higher than Cr and Fe. A positive correlation is observed between Li and Na, Mn, Fe, Ga, Sn, B, Cr, Ti, Be and a negative correlation with K, Cs, Ta, and Nb. Spodumene from the Dara-e-Pech deposit contains more gallium than from the Kolatan and Tsamgal deposits, which is of practical importance. Sharp boundaries between growth zones indicate a diffusion rate that was less than the rate of crystal growth that occurred in conditions of pegmatite melt crystallization. As a result of the exchange with the residual melt, insignificant post-crystallization diffusion and restoration of equilibrium between the crystal and the environment took place.

Ключевые слова редкометалльные пегматиты сподумен зональность парагенезис редкие элементы метод SIMS Восточный Афганистан

Keywords rare-metal pegmatites spodumene zoning paragenesis rare elements SIMS method Eastern Afghanistan

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