Composition of Cs-rich analcime in spodumene pegmatites of Afghanistan (Kolatan Deposit, Nuristan province)
- Authors: Skublov S.G.1, Yosufzaib A.2,3, Evdokimov A.N.2, Galankina O.L.1
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Affiliations:
- Institute of Precambrian Geology and Geochronology RAS
- Saint-Petersburg Mining University
- Kabul Polytechnic University,
- Issue: Vol CLIII, No 6 (2024)
- Pages: 122-140
- Section: МИНЕРАЛЫ И ПАРАГЕНЕЗИСЫ МИНЕРАЛОВ
- URL: https://journals.rcsi.science/0869-6055/article/view/287030
- DOI: https://doi.org/10.31857/S0869605524060053
- EDN: https://elibrary.ru/NWHAWU
- ID: 287030
Cite item
Abstract
In spodumene pegmatites, the Kolatan deposit, Nuristan province, Afghanistan, a large (about 15 mm) crystal of Cs-rich analcime was discovered for the first time in the region. The SEM-EDS and SIMS methods identified its concentric zoning. The formula (Na0.78Cs0.05K0.02)Σ0.85[(Al0.89Si2.12)Σ3.01O6]·0.65H2O corresponds to the average composition of the mineral. The analysis of crystal zoning in two profiles by the SEM-EDS method (93 points) shows that Cs content is maximum in the core of the crystal and decrease to the rim. Contents of K, Na, and Al increase from core to rim. SIMS method (16 points) confirms the pointed profile of Cs which content decreases from 65 100 to 9200 ppm. The profile of Ca has smoother appearance. Profiles of transition metals (Mn, Fe, Ni, Cr, and V) are complex. The Rb profile is peaked and asymmetric: in the one part of the profile, Rb content varies insignificantly, in the another part it decreases from 250 ppm to 80 ppm. Water content increases from core to rim (from 48 400 ppm to 68 700 ppm). Most likely, this increasing reflects the transition to the hydrothermal stage. It is possible to assume that the formation of Cs-rich analcime marked the completion of the magmatic stage of pegmatite formation, the temperature regime of which is estimated as ~400°C. The find of such a large and gem quality crystal of extremely rare Cs-rich analcime is unique.
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About the authors
S. G. Skublov
Institute of Precambrian Geology and Geochronology RAS
Author for correspondence.
Email: skublov@yandex.ru
Russian Federation, Saint-Petersburg
A. Yosufzaib
Saint-Petersburg Mining University; Kabul Polytechnic University,
Email: ata.yosufzai@gmail.com
Russian Federation, Saint-Petersburg; Kabul, Afghanistan
A. N. Evdokimov
Saint-Petersburg Mining University
Email: evdokimov_an@pers.spmi.ru
Russian Federation, Saint-Petersburg
O. L. Galankina
Institute of Precambrian Geology and Geochronology RAS
Email: galankinaol@mail.ru
Russian Federation, Saint-Petersburg
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