Abstract The phenomenon of an abnormally high concentration of tantalum (5.3–17.9% of Ta 2 O 5 ) 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.

中文翻译：

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来自锂氟花岗岩的锡石中同晶钽的极高浓度（Arga-Ynnakh-Khaysky Massif，雅库特）

摘要 描述了雅库特东部 Arga-Ynnakh-Khaysky 地块含锂氟花岗岩的副锡石中钽浓度异常高（Ta 2 O 5 的 5.3-17.9%）的现象。锡石结构的显着同晶能力与貒沸石杂质相关，达到 15.1-39.8%。结论是含钽锡石的产地是由锂氟花岗岩的特定结晶条件决定的，它们在俄罗斯远东地区的广泛分布需要进一步研究稀有金属花岗岩中副锡石的类型化学和成因。相关交代物。