MOSSBAUER SPECTROSCOPIC EVIDENCE FOR NONEQUIVALENT SITES OF IRON ATOMS IN GOLD-BEARING ARSENOPYRITE
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dc.contributor.author | Murzin V.V. | |
dc.contributor.author | Semenkin V.A. | |
dc.contributor.author | Pikulev A.I. | |
dc.contributor.author | Mil'der O.B. | |
dc.contributor.author | Sustavov S.G. | |
dc.contributor.author | Krinov D.I. | |
dc.date.accessioned | 2022-01-12T07:50:46Z | |
dc.date.available | 2022-01-12T07:50:46Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13423358 | |
dc.identifier.citation | Geochemistry International, 2003, 41, 8, 812-820 | |
dc.identifier.issn | 0016-7029 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34214 | |
dc.description.abstract | Eight samples of arsenopyrite from the Kochkar (Southern Urals) and Nezhdaninskoe (Siberia) deposits were studied by the method of Fe-57 Mossbauer spectroscopy. The mineral samples showed considerable variations in arsenic and sulfur contents, S/As = 0.98-1.25. According to INAA data, the arsenopyrite contains up to 343.7 ppm Au, and more than 95% of the gold in the Nezhdaninskoe deposit is chemically bound [6]. The Fe-57 Mossbauer spectra of arsenopyrite from the Kochkar deposit are interpreted as a superposition of three quadrupole doublets, and the spectra of the Nezhdaninskoe arsenopyrite also contain an additional singlet component. With respect to Is and Qs values (mm/s, Is = 0.238-0.276, Qs = 1.096-1.13; Is = 0.25-0.36, Qs = 0.59-0.79; and Is = 0.223-0.278, Qs = 1.32-1.55), the doublets are identical or similar to the published data for arsenopyrite FeAsS, pyrite and/or marcasite FeS2, and loellingite FeAs2, In the Kochkar deposit, a regular increase in Is and a decrease in Qs were observed for all three iron positions described by the doublets with increasing interplanar distance d(202) and S/As of arsenopyrite. It was supposed that each of them can be presented as a combination of polyhedra with a certain population of S and As atoms dissolved in the arsenopyrite structure and not forming their own mineral phases. The iron position described by the singlet (Is = 0.580-0.60 mm/s) is most appropriate for its isomorphic replacement by gold. | |
dc.subject | Mossbauer spectroscopy | |
dc.subject | Arsenopyrite | |
dc.title | MOSSBAUER SPECTROSCOPIC EVIDENCE FOR NONEQUIVALENT SITES OF IRON ATOMS IN GOLD-BEARING ARSENOPYRITE | |
dc.type | Статья |
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