Das System Gold-Wismut-Tellur

Gather, B.; Blachnik, R.

doi:10.1515/ijmr-1974-651007

Cited by 3 publications

(1 citation statement)

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“…We believe, however, following Bachechi [6], that the role of Sb is the main one, since the phase corresponding to montbrayite based on X-ray diffraction was synthesized only in the Au-Sb-Te system [7][8][9]. In the Au-Bi-Te [30,31] and Au-Pb-Te [32] systems, no ternary compounds were detected. Montbrayite from the Svetlinsk deposit is an Sb-rich variety of the mineral.…”

Section: Formation Conditions Of Montbrayitementioning

confidence: 99%

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Vikent’eva,

Shilovskikh,

Shcherbakov

et al. 2023

Minerals

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A rare gold–telluride montbrayite from the large Svetlinsk gold–telluride deposit (South Urals, Russia) was comprehensively studied using optical microscopy, scanning electron microscopy, electron microprobe analysis, reflectance measurements, electron backscatter diffraction, and Raman spectroscopy. Significant variations in the composition of the mineral were revealed (in wt%): Au 36.98–48.66, Te 43.35–56.53, Sb 2.49–8.10, Ag up to 4.56, Pb up to 2.04, Bi up to 0.33, Cu up to 1.42. There are two distinct groups with much more-limited variation within the observed compositional interval (in wt%): (1) Au 36.98–41.22, Te 49.35–56.53, Sb 2.49–5.57; (2) Au 47.86–48.66, Te 43.35–44.92, Sb 7.15–8.10. The empirical formula calculated on the basis of 61 apfu is Au16.43–23.28Sb1.79–6.09Te32.01–38.89Ag0–3.69Bi0–0.14Pb0–0.90Cu0–1.96. Two substitution mechanisms for antimony are proposed in the studied montbrayite grains: Sb→Au (2.5–5.6 wt% Sb) and Sb→Te (7–8 wt% Sb). The dependence of the reflection spectra and Raman spectra on the antimony content and its substitution mechanism, respectively, was found in the mineral. The slope of the reflectance spectra decreases and the curve in the blue–green region of the spectrum disappears with increasing Sb content in montbrayite. Raman spectra are reported for the first time for this mineral. The average positions of the peak with high-intensity are ~64 cm−1 and ~90 cm−1 for montbrayite with Sb→Te and Sb→Au, respectively. Two grains of montbrayite demonstrate decomposition according to two schemes: (1) montbrayite (7 wt% Sb) → native gold + calaverite ± altaite, and (2) montbrayite (5 wt% Sb) → native gold + tellurantimony ± altaite. A combination of melting and dissolution–precipitation processes may be responsible for the formation of these decomposition textures.

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Section: Formation Conditions Of Montbrayitementioning

confidence: 99%

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Vikent’eva,

Shilovskikh,

Shcherbakov

et al. 2023

Minerals

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Partial Melting of Sulfide Ore Deposits During Medium- And High-Grade Metamorphism

Frost¹,

Mavrogenes²,

Tomkins³

2002

The Canadian Mineralogist

201

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Evidences of Mineral Melting in the Ores of the Svetlinsk Gold Deposit, South Urals, Russia

Vikent’eva,

Bortnikov

2023

Doklady Rossijskoj akademii nauk. Nauki o Zemle

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For the large Svetlinsk gold deposit (South Urals) evidences of partial melting of minerals and possible participation of polymetallic melts in the concentration and redistribution of gold and other metals are given. Finding of bismuth and antimony minerals in ores, among which there are gold minerals new to the deposit (pampaloite, montbrayite and aurostibite), specific mineral intergrowths (polymineral Sb–Bi–Pb–Te–Ag–Au drop inclusions), enrichment of early sulphides with Low-Melting-point Chalcophile Elements (LMCE), high formation temperatures for ore assemblages (up to 400°C), as well as the occurring metamorphism of amphibolite facies indicate the possibility of the formation of such melts. Polymetallic melts at the deposit could be formed both by partial melting of early sulphides and directly from hydrothermal fluids. The signs of melting also include simplectites of calaverite and native gold in the marginal parts of the large montbrayite grain.

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Das System Gold-Wismut-Tellur

Cited by 3 publications

References 0 publications

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Partial Melting of Sulfide Ore Deposits During Medium- And High-Grade Metamorphism

Evidences of Mineral Melting in the Ores of the Svetlinsk Gold Deposit, South Urals, Russia

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