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• W3012016283 abstract "Arsenian pyrite is an abundant mineral occurring in many geological settings at the Earth’s surface, including hydrothermal ore deposits which are the main source of Au. So-called “invisible” (or refractory) form of Au is present in pyrites in all types of these deposits, and its concentration is often directly correlated with As content. Here we report results of the investigation of the local atomic structure of Au in natural (Cu-Au-porphyry) and synthetic (450°C/ 1 kbar, 300°C/ Psat) As-free and As-bearing pyrites by means of X-ray absorption spectroscopy (XAS). In addition, the state of As was determined in pyrite samples from Carlin-type deposit. XANES/EXAFS measurements, compiled with previously published data, revealed the chemical state (valence state, local atomic environment) of Au and As in arsenian pyrites. Au is present in the solid solution state (Au 1+ in the Fe position, octahedrally coordinated by S atoms), as well as in Au 1+ 2 S clusters (Au 1+ linearly coordinated by 2 S atoms). The admixture of As has no effect on the Au valence state and Au-S interatomic distance, except one synthetic sample containing a minor amount of FeAsS. Arsenic mostly incorporates into the anion site in pyrite lattice (S 1- ↔As 1- ). Our data demonstrate that pyrites of hydrothermal origin can host up to ~300 ppm of structurally bound “invisible” Au independently of As content." @default.
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• W3012016283 date "2019-01-01" @default.
• W3012016283 modified "2023-09-25" @default.
• W3012016283 title "X-ray absorption spectroscopy study of the chemistry of «invisible» Au in arsenian pyrites" @default.
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• W3012016283 doi "https://doi.org/10.1051/e3sconf/20199805007" @default.
• W3012016283 hasPublicationYear "2019" @default.
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