Abstract
The phenomenon of an abnormally high concentration of tantalum (5.3–17.9% of Ta2O5) in accessory cassiterite from lithium–fluoric granites of the Arga-Ynnakh-Khaysky massif in East Yakutia is described. The significant isomorphic capacity of the cassiterite structure in relation to the tapiolite impurity, which reaches 15.1–39.8%, is established. It is concluded that the origin of tantalum-bearing cassiterite is determined by the specific crystallization conditions of lithium–fluoric granites, and their wide distribution in the Far East of Russia requires further study of the typochemistry of accessory cassiterite from rare-metal granites and genetically related metasomatites.
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This work was performed within the framework of the research program of IGGP RAS (project no. 0132-2019-0013).
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Translated by L. Mukhortova
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Alekseev, V.I., Marin, Y.B. & Galankina, O.L. An Extreme Concentration of Isomorphic Tantalum in Cassiterite from Lithium–Fluoric Granites (Arga-Ynnakh-Khaysky Massif, Yakutia). Dokl. Earth Sc. 490, 65–67 (2020). https://doi.org/10.1134/S1028334X2002004X
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DOI: https://doi.org/10.1134/S1028334X2002004X