Distribution of 'Invisible' Noble Metals between Pyrite and Arsenopyrite Exemplified by Minerals Coexisting in Orogenic Au Deposits of North-Eastern Russia
| Autor: | Olga Yu. Belozerova, N. V. Smagunov, Vladimir L. Tauson, S. V. Lipko, R. G. Kravtsova, Irina Voronova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:QE351-399.2
010504 meteorology & atmospheric sciences chemistry.chemical_element noble metals engineering.material 010502 geochemistry & geophysics 01 natural sciences Metal Impurity distribution Fugacity 0105 earth and related environmental sciences Arsenopyrite Mineral lcsh:Mineralogy Geology Geotechnical Engineering and Engineering Geology Sulfur structural and surficial modes pyrite Crystallography invisible species chemistry visual_art visual_art.visual_art_medium engineering arsenopyrite Crystallite Pyrite |
| Zdroj: | Minerals, Vol 9, Iss 11, p 660 (2019) Minerals Volume 9 Issue 11 |
| Popis: | The study focused on the forms of occurrence and distribution of hidden (&ldquo invisible&rdquo ) noble metals (NMs = Au, Ag, Pt, Pd, Ru) in the coexisting pyrites and arsenopyrites of four samples of mineral associations from three Au deposits in the north-east of Russia. The unique nature of our approach was the combination of methods of local analysis and statistics of the compositions of individual single crystals of different sizes. This allowed us to take into account the contribution of the surface component to the total NM content and to distinguish the structurally bound form of the elements. The following estimates of the distribution coefficients of the structural (str) and surficial (sur) forms of elements were obtained: D ¯ P y / A s p s t r = 2.7 (Au), 2.5 (Pd), 1.6 (Pt), 1.7 (Ru) and D ¯ P y / A s p s u r = 1.6 (Au), 1.1 (Pd), 1.5 (Pt and Ru). The data on Ag in most cases indicated its fractionation into pyrite ( D ¯ = 17). Surface enrichment was considered as a universal factor in &ldquo NM distribution. A number of elements (i.e., Pt, Ru, Ag) tended to increase their content with a decrease in the crystallite size in pyrite and arsenopyrite. This may be due to both the phase size effect and the intracrystalline adsorption of these elements at the interblock boundaries of a dislocation nature. The excess of metal (or the presence of S vacancies) in pyrite increased Ag and Pt content in its structure and, to a lesser extent, the content of Ru, Pd and Au. Arsenopyrite exhibited a clear tendency to increase the content of Pt, Ru and Pd in samples with excess As over S. Sulphur deficiency was a favourable factor for the incorporation of Ag and platinoids into the structures of the mineral associations studied. Perhaps this was due to the lower sulphur fugacity. Pyrite with excess Fe was associated with higher contents of some NMs. The presence of other impurity elements was not an independent factor in NM concentration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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