Вестник МГТУ, 2021, Т. 24, № 1.

Хубер М. и др. Изотопные характеристики серы сульфидов Хибинского и Ловозерского массивов. Ni)9S8, sample 04LV), chalcopyrite (CuFeS2, sample 03LV), and pyrite (FeS2, samples 01LV, 05LV). The results of the sulfur isotopes study 534S vary widely from +1.48 to +6.30 % VCDT (Table). The pentlandite in the Lovozero samples has value +1.48 % VCDT, 534S values of chalcopyrite is +2.85 % VCDT. The maximum positive 534S values are obtained for pyrite, which vary from +5.41 to +6.30 % VCDT (Table). Fig. 3. Photos of the Khibina (a, b - sample 01CH) and Lovozero (c, d - sample 04LV) samples of sulfide-bearing nepheline syenite. b, d - photo of the polished thin section in transmitted light. Mineral symbols: Py - pyrite; Ccp - chalcopyrite; Kfs - orthoclase; Pl - plagioclase; Rbk - riebeckite; Aeg - aegirine; Nph - nepheline; Ap - apatite; Arf - arfvedsonite; Eud - eudialyte; Ttn - titanite; Ilm - ilmenite Рис. 3. Фотографии образцов сульфидсодержащих нефелиновых сиенитов Хибинского (a, b) и Ловозерского массивов (c, d). b, d - фотография полированного шлифа в проходящем свете. Символы минералов: Py - пирит; Ccp - халькопирит; Kfs - ортоклаз; Pl - плагиоклаз; Rbk - рибекит; Aeg - эгирин; Ne - нефелин; Ap - апатит; Arf - арфведсонит; Eud - эвдиалит; Ttn - титанит; Ilm - ильменит Table. 534S isotope data for sulfides from nepheline syenite of the Khibina and Lovozero massifs Таблица. Изотопные 534S данные для сульфидов из нефелиновых сиенитов Хибинского и Ловозерского массивов Massif Khibina Lovozero Sample 01CH 10CH 04CH 04LV 03LV 01LV 05LV Mineral Pn Pn Py Pn Ccp Py Py §34S vcdt (%) 0.69 1.90-2.06 4.80-4.92 1.48 2.85 5.41 5.45-6.30 Variation in the 534S signature can be explained by changes in the redox conditions, fluid sources, and/or the temperature of the hydrothermal fluid. The ranges in 534S values are generally large but vary according to the isotopic fractionation between the sulfide phase and the melt or fluid. This is evidenced by mineral associations, including numerous sulfide minerals such as pentlandite, chalcopyrite and pyrite, which are accompanied by 84