scholarly journals Re Sulfides from Zhelos and Tokty-Oi Intrusions (East Sayan, Russia)

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 479 ◽  
Author(s):  
Tatiana Kolotilina ◽  
Aleksey Mekhonoshin ◽  
Dmitriy Orsoev
Keyword(s):  
General Formula ◽  
Electron Microprobe ◽  
Platinum Group Elements ◽  
Metal Ratio ◽  
Rich Liquid ◽  
Mineral Compositions ◽  
Break Up ◽  
Platinum Group

Re sulfides were discovered in Cu–Ni–platinum-group elements (PGE) ores of the Zhelos and Tokty-Oi intrusions. These intrusions can be considered as products of the mantle superplume responsible for Rodinia’s break-up. The mineral compositions were determined in situ in polished samples. Electron microprobe analyses were mostly consistent with a general formula of (Cu,Fe,Mo,Os,Re)5S8, (Cu,Fe,Mo,Os,Re)4S7, and (Cu,Fe,Mo,Re)S2. One of the major features of Re sulfide from the Zhelos intrusion is its high osmium content. The ΣMe/S ratio for a part of our data is consistent with that of the tarkianite. Re sulfides from the Tokty-Oi have a ΣMe/S ratio similar to those in rheniite or dzeskazganite, but differ from them by the presence of Fe and Cu and the metal-to-metal ratio. The localization of the Re sulfide within the chalcopyrite suggests its crystallization from the residual Cu-rich liquid.

Development of sulfide reference materials for in situ platinum group elements and S–Pb isotope analyses by LA-(MC)-ICP-MS

2018 ◽  
Vol 33 (12) ◽  
pp. 2172-2183 ◽  
Author(s):  
Yantong Feng ◽  
Wen Zhang ◽  
Zhaochu Hu ◽  
Yongsheng Liu ◽  
Kang Chen ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Reference Materials ◽  
Platinum Group Elements ◽  
Pb Isotopes ◽  
Synthetic Method ◽  
Pb Isotope ◽  
Icp Ms ◽  
Platinum Group ◽  
Isotope Analyses

A new synthetic method has been used to prepare sulfide reference materials for the in situ analysis of PGEs and S–Pb isotopes. The results indicate that the hydrothermal synthesis of the nanoparticles can serve as a potentially effective approach for the preparation of microanalysis reference materials.

Phases in the Ni–Sb–As system which occur in the Bon Accord oxide body, Barberton greenstone belt, South Africa

2016 ◽  
Vol 80 (1) ◽  
pp. 187-198 ◽  
Author(s):  
M. Tredoux ◽  
F. Zaccarini ◽  
G. Garuti ◽  
D. E. Miller
Keyword(s):  
South Africa ◽  
Electron Microprobe ◽  
Greenstone Belt ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Platinum Group Elements ◽  
High Magnification ◽  
Barberton Greenstone Belt ◽  
Grain Sizes ◽  
Platinum Group

AbstractAn oxide-silicate occurrence, containing >40 wt.% NiO whole rock and showing enrichment in the platinum-group elements and antimony, was investigated at high magnification. Many phases with grain sizes generally <100 μm were observed; electron microprobe analysis indicated that, although some of these are known minerals in Ni–Sb–As space (such as breithauptite and orcelite), most of them cluster around the following compositions: Ni3Sb, Ni3(Sb,As), Ni3As, Ni5(Sb,As)2, Ni7(Sb,As)3 and Ni11(Sb,As)8. Such phases have been observed in synthetic systems, but up to now not in nature. The data reported here therefore probably represent the compositions of new minerals.

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