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Composition and ligand microstructure of arsenopyrite from gold ore deposits of the Yenisei Ridge (Eastern Siberia, Russia)

Описание

Тип публикации: статья из журнала

Год издания: 2019

Идентификатор DOI: 10.3390/min9120737

Ключевые слова: Arsenopyrite, Crystal lattice, Gold, Gold ore deposits, Invisible gold, Ligand surroundings, Mössbauer Effect, Non-equal positions

Аннотация: The Mössbauer spectroscopy method was used to study the ligand microstructure of natural arsenopyrite (31 specimens) from the ores of the major gold deposits of the Yenisei Ridge (Eastern Siberia, Russia). Arsenopyrite and native gold are paragenetic minerals in the ore; meanwhile, arsenopyrite is frequently a gold carrier. We deteПоказать полностьюcted iron positions with variable distribution of sulfur and arsenic anions at the vertexes of the coordination octahedron {6S}, {5S1As}, {4S2As}, {3S3As}, {2S4As}, {1S5As}, {6As} in the mineral structure. Iron atoms with reduced local symmetry in tetrahedral cavities, as well as iron in the high-spin condition with a high local symmetry of the first coordination sphere, were identified. The configuration {3S3As} typical for the stoichiometric arsenopyrite is the most occupied. The occupation degree of other configurations is not subordinated to the statistic distribution and varies within a wide range. The presence of configurations {6S}, {3S3As}, {6As} and their variable occupation degree indicate that natural arsenopyrites are solid pyrite {6S}, arsenopyrite {3S3As}, and loellingite {6As} solutions, with the thermodynamic preference to the formation of configurations in the arsenopyrite–pyrite–loellingite order. It is assumed that in the variations as part of the coordination octahedron, the iron output to the tetrahedral positions and the presence of high-spin Fe cations depend on the physical and chemical conditions of the mineral formation. It was identified that the increased gold concentrations are typical for arsenopyrites with an elevated content of sulfur or arsenic and correlate with the increase of the occupation degree of configurations {5S1As}, {4S2As}, {1S5As}, reduction of the share of {3S3As}, and the amount of iron in tetrahedral cavities. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

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Издание

Журнал: Minerals

Выпуск журнала: Vol. 9, Is. 12

Номера страниц: 737

ISSN журнала: 2075163X

Издатель: MDPI AG

Персоны

  • Sazonov A.M. (Institute of Mining, Geology and Geotechnology, Siberian Federal University, 79 pr. Svobodny, Krasnoyarsk, 660041, Russian Federation)
  • Silyanov S.A. (Institute of Mining, Geology and Geotechnology, Siberian Federal University, 79 pr. Svobodny, Krasnoyarsk, 660041, Russian Federation)
  • Bayukov O.A. (Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center of the Siberian Brof the Russian Academy of Sciences, 50 Bld. 38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation)
  • Knyazev Y.V. (Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center of the Siberian Brof the Russian Academy of Sciences, 50 Bld. 38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation)
  • Zvyagina Y.A. (Institute of Mining, Geology and Geotechnology, Siberian Federal University, 79 pr. Svobodny, Krasnoyarsk, 660041, Russian Federation)
  • Tishin P.A. (Faculty of Geology and Geography, Tomsk National Research State University, 36 Lenina, Tomsk, 634050, Russian Federation)

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