The system Ag-Sb-S from 600�C to 200�C

Keighin, C.W.; Honea, Russell M.

doi:10.1007/bf00208050

Cited by 60 publications

(43 citation statements)

References 25 publications

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“…A charge was run at 500 ~ with an equivalent starting composition and 98 ~o of phase cm produced. X-ray diffraction analysis reveals it to have an identical structure to the quenchable high temperature (> 380 ~ cubic form of miargyrite, fl-AgSbS2 (Keighin and Honea, 1969). Cm may represent a member of a solid-solution series involving Cd substitution according to 2Cd § ~ Ag++Sb 3+ into miargyrite, AgSbS2.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

Pattrick

Hall

1983

Mineral. mag.

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Section: Experimental Methods and Resultsmentioning

confidence: 99%

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

Pattrick

Hall

1983

Mineral. mag.

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“…Keighin & Honea (1969) determined 197°C as the maximum temperature of stephanite formation. The mineral breaks down to pyrargyrite and argentite during heating above this temperature.…”

Section: Epithermal Character Of Ag-mineralizationmentioning

confidence: 99%

The paragenesis of silver minerals in the Pb-Zn Stan Terg deposit, Kosovo - an example of precious metal epithermal mineralization.

Kołodziejczyk¹,

Pršek²,

Asllani³

et al. 2016

geol

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This study reports silver mineral association found recently in the Stan Terg lead and zinc mine, located in the Vardar zone (in northern Kosovo). The described mineralization comprises pyrargyrite (Ag 3 SbS 3 ), freieslebenite (AgPbSbS 3 ), high-Ag bearing tetrahedrite and freibergite ((Ag 4+2x Cu 2−2x )[(Cu,Ag) 4 (Fe, Zn) 2 ]Σ6Sb 4 S 12 S 1−x with (0 < x < 1)); as well as native compounds (Electrum, composition of those minerals was confirmed by the electron microprobe. The freibergite from native silver is native antimony). The Ag-minerals occur in vuggs and cracks in a massive galena ore and have signs of the latest minerals, which precipitated in the deposit. The chemical of the Stan Terg deposit reveals zonality and contains between 13.91-20.28% of Ag. The high concentration of Ag in solutions is also indicated by relatively high silver content in Au-Ag alloy (electrum), which is between 47.02% and 73.19% of Ag. The Ag association is supposed to be an epithermal equivalent of precious metal mineralization, which could be located in the external part of the Stan Terg hydrothermal system. This association occurs in low temperatures, below 200°C. The Ag-minerals can be a part of epithermal veins from the external part of the Stan Terg hydrothermal system. Similarly to the other known Pb-Zn-Ag hydrothermal systems, the Ag association is related to the formation of the rhodochrosite banded ore and Ag-Au-Sb dominated mineralization.

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“…As an alternative, it could be an Ag-rich sulfosalt that has not been previously described, or an intergrowth of pyrargyrite, acanthite or argentite, and dyscrasite that is so fine that individual phases are not resolvable with the electron microprobe. As far as its relationship to the formation of a polymetallic melt is concerned, the identity of the Ag, Sb, S phase is not critical because its bulk composition would have been molten at 1 bar and 500°C regardless of what phases are present (Keighin & Honea 1969). At one bar, the bulk composition of the pyrargyrite melts congruently at 485°C and the eutectic between pyrargyrite and argentite lies at 465°C (Fig.…”

Section: Sulfide Sulfosalt and Alloy Assemblagesmentioning

confidence: 99%

“…At one bar, the bulk composition of the pyrargyrite melts congruently at 485°C and the eutectic between pyrargyrite and argentite lies at 465°C (Fig. 10) (Keighin & Honea, 1969). Because pyrargyrite and argentite melt at a binary euctectic, rather than melting incongruently to dyscrasite (or allargentum, Ag 6 Sb), the pyrargyrite-argentite join is a thermal barrier.…”

Section: Sulfide Sulfosalt and Alloy Assemblagesmentioning

confidence: 99%

Prolonged Existence of Sulfide Melt in the Broken Hill Orebody, New South Wales, Australia

Frost¹,

Swapp²,

Gregory³

2005

The Canadian Mineralogist

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The Broken Hill orebody, in Australia, is hosted in pelitic and psammitic gneisses that underwent metamorphism in the granulite facies. Peak metamorphism in the area occurred around 1600 Ma and exceeded temperatures of 850°C at pressures of 5-7 kilobars. The orebody is located in an area of intense deformation that occurred 5 to 15 million years after the peak metamorphism. Highly foliated pelitic schist directly adjacent to the Broken Hill orebody contains assemblages ranging from quartz -K-feldspar -biotite -garnet -sillimanite to quartz -muscovite -biotite -staurolite -garnet -chlorite. The latter assemblage equilibrated at temperatures as low as 600°C. Silicates in the low-temperature assemblages are intimately associated with galena that, in places contains clusters rich in Ag and Sb alloys, sulfides, and sulfosalts. One-bar experiments in the system Ag-Sb-S indicate that the assemblages seen in these rocks would have been molten at 500°C. These relations suggest that a polymetallic melt persisted at Broken Hill for up to twenty million years after peak metamorphism.Keywords: metamorphism, orebody, massive sulfides, melting, Broken Hill, Australia. SOMMAIRELe gisement de Broken Hill, en Australie, est situé dans un hôte gneissique métapélitique et métapsammitique qui a subi un métamorphisme au faciès granulite. Le paroxysme métamorphique dans la région a eu lieu il y a environ 1600 millions d'années, et a impliqué une température au delà de 850°C à une pression entre 5 et 7 kilobars. Le gisement est situé dans une zone de déformation intense active de 5 à 15 million d'années après la culmination métamorphique. Des schistes pélitiques fortement foliés directement adjacents au gisement de Broken Hill contiennent des assemblages allant de quartz -feldspath potassiquebiotite -grenat -sillimanite à quartz -muscovite -biotite -staurolite -grenat -chlorite. Ce deuxième assemblage s'est équilibré à une température aussi basse que 600°C. Les silicates des assemblages de plus faible température sont intimement associés à la galène qui, par endroits, contient des amas riches en alliages, sulfures et sulfosels d'argent et d'antimoine. Des expériences à un bar dans le système Ag-Sb-S indiquent que les assemblages de ces roches pourraient avoir été à l'état fondu à 500°C. Ces relations font penser qu'un liquide polymétallique a persisté à Broken Hill jusqu'à vingt millions d'années après la culmination métamorphique.(Traduit par la Rédaction)

show abstract

The system Ag-Sb-S from 600�C to 200�C

Cited by 60 publications

References 25 publications

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

Silver substitution into synthetic zinc, cadmium, and iron tetrahedrites

The paragenesis of silver minerals in the Pb-Zn Stan Terg deposit, Kosovo - an example of precious metal epithermal mineralization.

Prolonged Existence of Sulfide Melt in the Broken Hill Orebody, New South Wales, Australia

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