Thermodynamic properties of solid solutions in the system Ag2S–Ag2Se

Palyanova, Galina; Чудненко, К. В.; Zhuravkova, T.V.

doi:10.1016/j.tca.2013.10.018

Cited by 35 publications

(15 citation statements)

References 22 publications

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“…They suggest that two distinct solid solution series could exist: monoclinic "acanthite-type" series including aguilarite in the range Ag 2 S-Ag 2 S 0.4 Se 0.6 , and an orthorhombic "naumannite-type" series between Ag 2 S 0.3 Se 0.7 -Ag 2 Se. The status of members with Se contents in the range 0.60-0.70 (or 1.2-1.4 for 6 apfu of aguilarite), which correspond to two-phase (monoclinic and orthorhombic) field as was described by Pingitore et al [67] or Pal'yanova et al [68] is still under debate. According to Kullerud et al [69], there are two possible explanations-presence of metastable cubic high-temperature phase or mixtures of two submicroscopic phases formed during cooling of homogenous cubic phase below 80 • C. Natural minerals with compositions related to this two-phase field have also been reported [68,69].…”

Section: Aguilarite Ag 4 Sesmentioning

confidence: 97%

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

2019

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Significant selenium enrichment associated with selenides and previously unknown Ag-Pb-Sb, Ag-Sb and Pb-Sb sulfosalts has been discovered in hydrothermal ore veins in the Anthony of Padua mine near Poličany, Kutná Hora ore district, central Bohemia, Czech Republic. The ore mineralogy and crystal chemistry of more than twenty silver minerals are studied here. Selenium mineralization is evidenced by a) the occurrence of selenium minerals, and b) significantly increased selenium contents in sulfosalts. Identified selenium minerals include aguilarite and selenides naumannite and clausthalite. The previously unknown sulfosalts from Kutná Hora are identified: Ag-excess fizélyite, fizélyite, andorite IV, andorite VI, unnamed Ag-poor Ag-Pb-Sb sulfosalts, semseyite, stephanite, polybasite, unnamed Ag-Cu-S mineral phases and uytenbogaardtite. Among the newly identified sulfides is argyrodite; germanium is a new chemical element in geochemistry of Kutná Hora. Three types of ore were recognized in the vein assemblage: the Pb-rich black ore (i) in quartz; the Ag-rich red ore (ii) in kutnohorite-quartz gangue; and the Ag-rich ore (iii) in milky quartz without sulfides. The general succession scheme runs for the Pb-rich black ore (i) as follows: galena – boulangerite (– jamesonite) – owyheeite – fizélyite – Ag-exces fizélyite – andorite IV – andorite VI – freieslebenite – diaphorite – miargyrite – freibergite. For the Ag-rich red ore (ii) and ore (iii) the most prominent pattern is: galena – diaphorite – freibergite – miargyrite – pyragyrite – stephanite – polybasite – acanthite. The parallel succession scheme progresses from Se-poor to Se-rich phases, i.e., galena – members of galena – clausthalite solid solution – clausthalite; miargyrite – Se-rich miargyrite; acanthite – aguilarite – naumannite. A likely source of selenium is in the serpentinized ultrabasic bodies, known in the area of “silver” lodes in the South of the ore district, which may enable to pre-concentrate selenium, released into hydrothermal fluids during tectonic events. The origin of the studied ore mineralization is primarily bound to the youngest stage of mineralization of the whole ore district, corresponding to the Ag-Sb sequence of the ´eb´ ore type of the Freiberg ore district in Saxony (Germany) and shows mineralogical and geochemical similarities to low-sulfidation epithermal-style Ag-Au mineralization.

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Section: Aguilarite Ag 4 Sesmentioning

confidence: 97%

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

2019

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“…They suggest that two distinct solid solution series could exist: monoclinic "acanthite-type" series including aguilarite in the range Ag2S -Ag2S0.4Se0.6, and an orthorhombic "naumannite-type" series between Ag2S0.3Se0.7 -Ag2Se. The question is the status of members with Se contents in the range 0.60 -0.70, which correspond to two-phase (monoclinic and orthorhombic) field, which was described by Pingitore et al [36] or Pal'yanova et al [37]. There are two possible explanations -either presence of metastable cubic high-temperature phase or mixtures of two sub-microscopic phases formed during cooling of a homogenous cubic phase below 80 °C [38].…”

Section: Selenidesmentioning

confidence: 99%

Selenium-Rich Ag-Au Mineralization at the Kremnica Au-Ag Epithermal Deposit, Slovak Republic

Števko¹,

Sejkora²,

Dolníček³

et al. 2018

Preprint

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Selenium-rich Au-Ag mineralization has been discovered in the Kremnica ore district, central Slovakia. The mineralization is hosted by a single quartz-dolomite vein hosted by Neogene propyllitized andesites of the Kremnica stratovolcano. Ore mineralogy and crystal chemistry of individual ore minerals have been studied here. The early base-metal ore mineralization composed of pyrite, sphalerite and chalcopyrite lacks selenium, whereas the superimposed Au-Ag paragenesis is Se-enriched. The Au-Ag alloys, uytenbogaardtite, minerals of the galena-clausthalite series, acanthite-naumannite series, diaphorite, miargyrite, pyrargyrite-proustite, polybasite group, minerals of the tetrahedrite group and andorite branch (andorite IV, andorite VI, Ag-excess fizélyite), freislebenite, and rare Pb-Sb sulphosalts (scaiinite, robinsonite, plagionite) have been identified here. Besides selenides, the most Se-enriched phases are miargyrite, proustite-pyrargyrite, and polybasite-pearceite, whose Se contents are among the highest reported worldwide. In addition, one new phase has been found, corresponding to a Se-analogue of pearceite containing 2.08 - 3.54 apfu Se. The style of mineralization, paragenetic situation, and chemical trends observed in individual minerals are comparable to those of Au-Ag low-sulphidation epithermal Au-Ag mineralizations of the Kremnica and neighboring &Scaron;tiavnica and Hodru&scaron;a-Hámre Ore Districts, however, the pronounced enrichment in selenium is a specific feature of the studied vein only.

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“…The Ag 2 SAg 2 Se chalcogenides are characterized by the presence of phase transitions and structure phase transformations [1][2][3][4][5]. Roy et al [6] suggested using silver sulfide and selenide transitions as geologic thermometers.…”

Section: Introductionmentioning

confidence: 99%

Sulfur–selenium isomorphous substitution and polymorphism in the Ag2(S,Se) series

Seryotkin

Palyanova

Кох

2015

Journal of Alloys and Compounds

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Thermodynamic properties of solid solutions in the system Ag2S–Ag2Se

Cited by 35 publications

References 22 publications

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

Selenium-Rich Ag-Au Mineralization at the Kremnica Au-Ag Epithermal Deposit, Slovak Republic

Sulfur–selenium isomorphous substitution and polymorphism in the Ag2(S,Se) series

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