Микровключения, элементы-примеси в кристаллах касситерита месторождения Бутугычаг, Магаданская область

Microinclusions and impurity elements in cassiterite crystals from the Butugychag deposit have been studied. The deposit is located in the Ayan-Yuryakh (Upper Kolyma) tin-bearing district of Magadan Oblast and belongs to the tin-quartz industrial type of the rare metal-tungsten-tin formation. Electron microscopic studies (SEM) in cassiterite have revealed microinclusions of rutile, zircon, wolframite, aluminosilicates, and quartz. The LA-ICP-MS research exposed 13 impurity elements with concentrations exceeding 1 mg/kg in cassiterite. Of these, the average concentrations of Ga, Hf, Ta, and U are under 10 mg/kg; Al, Sc, V, Zr, Nb, Sb range from 10 to 61 mg/kg; Ti, W, 335 and 138 mg/kg, respectively; Fe, 1400 mg/kg. Mathematical methods have established the features of the element contents distribution and their correlations; assumptions have been made on possible mineral microinclusions in cassiterite crystals.