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sulfur fugacity

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Journal Article

Device for the measurement of sulfur fugacity mountable on the precession camera Available to Purchase

S. A. Kissin, S. D. Scott
Published: 01 December 1979
American Mineralogist (1979) 64 (11-12): 1306–1310.
...S. A. Kissin; S. D. Scott Abstract A device for measurement of sulfur fugacities of single crystals of sulfides at elevated temperatures was designed for use with a precession camera and successfully employed in studies of pyrrhotite. The device contains the solid-state electrochemical cell Pt, Ag...
View PDF for article title, Device for the measurement of <span class="search-highlight">sulfur</span> <span class="search-highlight">fugacity</span> mountable on the precession camera
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Journal Article

Stability of Fe-Mg amphiboles with respect to sulfur fugacity Available to Purchase

R. K. Popp, M. C. Gilbert, J. R. Craig
Published: 01 February 1977
American Mineralogist (1977) 62 (1-2): 13–30.
... pairs apparently are not seriously affected by temperature over the range investigated, although scatter of the amphibole data does not allow a rigorous analysis. Sulfur fugacity for runs was determined from pyrrhotite compositions, while fo 2 was known from an experimentally determined magnetite...
View PDF for article title, Stability of Fe-Mg amphiboles with respect to <span class="search-highlight">sulfur</span> <span class="search-highlight">fugacity</span>
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Journal Article

Iron sulfide stoichiometry as a monitor of sulfur fugacity in gas-mixing experiments Available to Purchase

Astrid Holzheid, Katharina Lodders
Published: 01 August 2013
American Mineralogist (2013) 98 (8-9): 1487–1496.
DOI: https://doi.org/10.2138/am.2013.4376
...Astrid Holzheid; Katharina Lodders Abstract We explore a method to utilize the stoichiometry of iron sulfide to determine the sulfur fugacity in experiments containing CO-CO 2 -SO 2 gas mixtures. The Fe-S phase diagram shows that the stoichiometry of iron sulfide melts is closely related...
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View PDF for article title, Iron sulfide stoichiometry as a monitor of <span class="search-highlight">sulfur</span> <span class="search-highlight">fugacity</span> in gas-mixing experiments
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Journal Article

AN EVALUATION OF THE EFFECT OF COPPER ON THE ESTIMATION OF SULFUR FUGACITY (f S 2 ) FROM PYRRHOTITE COMPOSITION Available to Purchase

Michael J. Mengason, Philip M. Piccoli, Philip Candela
Journal: Economic Geology
Published: 01 September 2010
Economic Geology (2010) 105 (6): 1163–1169.
DOI: https://doi.org/10.2113/econgeo.105.6.1163
...Michael J. Mengason; Philip M. Piccoli; Philip Candela Abstract Pyrrhotite is commonly used to estimate the fugacity of sulfur in natural and experimental systems; however, in some instances, high-temperature pyrrhotites can incorporate copper to such an extent as to raise questions concerning...
FIGURES
View PDF for article title, AN EVALUATION OF THE EFFECT OF COPPER ON THE ESTIMATION OF <span class="search-highlight">SULFUR</span> <span class="search-highlight">FUGACITY</span> (f S 2 ) FROM PYRRHOTITE COMPOSITION
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Journal Article

PHASE RELATIONSHIPS AND SULFUR FUGACITY IN THE SYSTEM Fe–FeS–NiS–Ni AT 900°C Available to Purchase

E.F. Sinyakova, V.I. Kosyakov
Published: 01 July 2006
Russ. Geol. Geophys. (2006) 47 (7): 838–849.
... components on the melt composition have been established. Using the pyrrhotite method, sulfur fugacity fS 2 was measured along the sections with 51, 48, and 45 at.% S and the FeS–Ni 3 S 2 section at 900 °C. Phase diagrams of ternary systems are usually constructed as polythermal sections, based on DTA...
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View PDF for article title, PHASE RELATIONSHIPS AND <span class="search-highlight">SULFUR</span> <span class="search-highlight">FUGACITY</span> IN THE SYSTEM Fe–FeS–NiS–Ni AT 900°C
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Journal Article

Platinum-group minerals as indicators of sulfur fugacity in ophiolitic upper mantle; an example from chromitites of the Ray-Iz ultramafic complex, Polar Urals, Russia Available to Purchase

Giorgio Garuti, Federica Zaccarini, Vasily Moloshag, Victor Alimov
Published: 01 October 1999
The Canadian Mineralogist (1999) 37 (5): 1099–1115.
View PDF for article title, Platinum-group minerals as indicators of <span class="search-highlight">sulfur</span> <span class="search-highlight">fugacity</span> in ophiolitic upper mantle; an example from chromitites of the Ray-Iz ultramafic complex, Polar Urals, Russia
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Journal Article

Placer Os-Ir-Ru alloys and sulfides; indicators of sulfur fugacity in an ophiolite? Available to Purchase

Mitsuru Nakagawa, Helenita E. A. Franco
Published: 01 December 1997
The Canadian Mineralogist (1997) 35 (6): 1441–1452.
View PDF for article title, Placer Os-Ir-Ru alloys and sulfides; indicators of <span class="search-highlight">sulfur</span> <span class="search-highlight">fugacity</span> in an ophiolite?
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Journal Article

The FeS Content of Sphalerite Along the Chalcopyrite-Pyrite-Bornite Sulfur Fugacity Buffer Available to Purchase

Gerald K. Czamanske
Journal: Economic Geology
Published: 01 December 1974
Economic Geology (1974) 69 (8): 1328–1334.
DOI: https://doi.org/10.2113/gsecongeo.69.8.1328
...Gerald K. Czamanske Abstract Concentrations of 0.19 + or - 0.02 and 0.55 + or - 0.08 mole percent FeS have been measured in sphalerite crystallized at 1 kbar in equilibrium with the chalcopyrite-pyrite-bornite sulfur fugacity buffer at temperatures of 271 degrees and 395 degrees C, respectively...
View PDF for article title, The FeS Content of Sphalerite Along the Chalcopyrite-Pyrite-Bornite <span class="search-highlight">Sulfur</span> <span class="search-highlight">Fugacity</span> Buffer
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Journal Article

Sulfur Fugacity Measurements with the Electrochemical Cell AgAgIAg (sub 2+x) S,f s Available to Purchase

E. P. Schneeberg
Journal: Economic Geology
Published: 01 July 1973
Economic Geology (1973) 68 (4): 507–517.
DOI: https://doi.org/10.2113/gsecongeo.68.4.507
...E. P. Schneeberg Abstract The electrochemical cell AgAgIAg (sub 2+x) S,S 2 (vapor), described by Wagner (1953), has been modified to measure sulfur fugacities buffered by mineral assemblages sealed in pyrex capsules. The cell was calibrated against the f (sub S 2 ) fixed by S (liquid) and Ag + Ag...
View PDF for article title, <span class="search-highlight">Sulfur</span> <span class="search-highlight">Fugacity</span> Measurements with the Electrochemical Cell AgAgIAg (sub 2+x) S,f s
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Journal Article

Effects of oxygen and sulfur fugacities on the scheelite-tungstenite and powellite-molybdenite stability relations Available to Purchase

L. C. Hsu
Journal: Economic Geology
Published: 01 July 1977
Economic Geology (1977) 72 (4): 664–670.
DOI: https://doi.org/10.2113/gsecongeo.72.4.664
... conditions, the oxygen and sulfur fugacities for the above reactions were controlled simultaneously by a single or combination of solid buffer assemblages. At P f = 1,000 bars and T = 577 degrees C, the equilibrium curve for reaction (1) passes through these points on the log f (sub S 2 ) - log f (sub O 2...
View PDF for article title, Effects of oxygen and <span class="search-highlight">sulfur</span> <span class="search-highlight">fugacities</span> on the scheelite-tungstenite and powellite-molybdenite stability relations
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Journal Article

Effects of temperature, sulfur, and oxygen fugacity on the composition of sphalerite from submarine hydrothermal vents Available to Purchase

Manuel Keith, Karsten M. Haase, Ulrich Schwarz-Schampera, Reiner Klemd, Sven Petersen, Wolfgang Bach
Journal: Geology
Published: 01 August 2014
Geology (2014) 42 (8): 699–702.
DOI: https://doi.org/10.1130/G35655.1
...Manuel Keith; Karsten M. Haase; Ulrich Schwarz-Schampera; Reiner Klemd; Sven Petersen; Wolfgang Bach Abstract Experimental studies have shown that temperature, pressure, sulfur fugacity ( f S 2 ), and oxygen fugacity ( f O 2 ) influence the Fe content of sphalerite. We present compositional in situ...
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View PDF for article title, Effects of temperature, <span class="search-highlight">sulfur</span>, and oxygen <span class="search-highlight">fugacity</span> on the composition of sphalerite from submarine hydrothermal vents
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Journal Article

Oxygen, Carbon Dioxide, and Sulfur Fugacities During Diagenesis and Low-Grade Metamorphism of Late Precambrian Subgraywackes from Northern Utah Available to Purchase

Kent C. Condie
Published: 01 August 1967
American Mineralogist (1967) 52 (7-8): 1153–1160.
... during diagenesis (25 ± 25°C) and again during metamorphism (400 ± 100°C), thermodynamic calculations indicate the following increases in oxygen, carbon dioxide, and sulfur fugacities during low-grade metamorphism (expressed in orders of magnitude): f 0 2 , 35–70; f co 2 , 0–9; f s 2 , 20–45. Progressive...
View PDF for article title, Oxygen, Carbon Dioxide, and <span class="search-highlight">Sulfur</span> <span class="search-highlight">Fugacities</span> During Diagenesis and Low-Grade Metamorphism of Late Precambrian Subgraywackes from Northern Utah
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Journal Article

The effects of oxygen fugacity and sulfur on the pressure of vapor-saturation of magma Available to Purchase

Ery C. Hughes, Philippa Liggins, Lee Saper, Edward M. Stolper
Published: 01 March 2024
American Mineralogist (2024) 109 (3): 422–438.
DOI: https://doi.org/10.2138/am-2022-8739
...: this is the pressure of vapor-saturation ( P sat v ). Most determinations of P sat v assume that melt and vapor contain only oxidized C-O-H species. However, sulfur is the third most abundant volatile element in magmas, and oxygen fugacity ( f O 2 ) exerts a strong influence on the speciation of the melt and vapor...
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View PDF for article title, The effects of oxygen <span class="search-highlight">fugacity</span> and <span class="search-highlight">sulfur</span> on the pressure of vapor-saturation of magma
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Includes: Supplemental Content
Image
Sulfur fugacity (Y=fS2) v. oxygen fugacity (fO2) for silm + v at T = 1200°C. Contours of Z are shown for (a) sulfur dioxide fugacity (fSO2), (b) pressure (P) and (c) total S content of the silicate melt (wSTm). (d) Sulfur speciation of the vapour (S2 and/or SO2) and silicate melt (S2− and/or S6+), where boundaries and colours are as defined in Figure 2, with the addition of black dashed curves for xSO2v=0.1 or 0.9; black continuous curves for [S6+/ST]m = 0.1 and 0.9; and an orange region for [S2− + S6+]m + [S2 + SO2]v (which was not intersected in Fig. 2). (e) Paths followed in fO2–fS2 space for different processes (overlain on contours of Z=wSTm): turquoise is constant fS2=10−4bar (as in Fig. 2a and b); purple is constant wSTm=400ppm (Fig. 2c and d); blue is constant P = 1 bar (Fig. 2e and f); yellow, green and orange are degassing at constant bulk O2 = 3.26, 3.87 and 4.23 wt%, respectively (Fig. 9); and grey is constant μFeS (continuous line) and/or μCaSO4 (dashed line) equal to sulfide melt- and anhydrite-saturation, respectively (Fig. 6a and b). In the white region at high fO2 and high fS2, wSTm&gt;10wt% and hence calculations are terminated. The values of the slopes of the curves and contours (σ) are labelled in boxes with a black outline. The grey curve indicates the boundary above which the silm + v assemblage is metastable; this curve is continuous when sulfide melt would saturate, dashed when anhydrite would saturate, and the grey star indicates that the silicate melt is multiply saturated with vapour, sulfide melt and anhydrite. The fO2 for different tectonic settings and abbreviations are as described in Figure 2.

Sulfur fugacity ( Y = f S 2 ) v. oxygen fugacity ( f ... Open Access

Published: 11 May 2023
Fig. 3. Sulfur fugacity ( Y = f S 2 ) v. oxygen fugacity ( f O 2 ) for sil m  +  v at T  = 1200°C. Contours of Z are shown for ( a ) sulfur dioxide fugacity ( f S O 2 ), ( b ) pressure ( P ) and ( c ) total S content of the silicate melt ( w
Image
(A) Diagram of oxygen fugacity (fO2) vs. sulfur fugacity (fS2) at 1 atm showing the superposition of stability fields of iron minerals (dashed lines) and manganese minerals at 400 K, according to Holland (1959). The coexistence of alabandite and pyrrhotite at Morro da Mina indicates reduced conditions. (B) Diagram of oxygen fugacity (fO2) vs. temperature, calculated using Geochemist’s Workbench (at 1 atm pressure below 100 °C and along the vapour pressure at higher temperatures, and activities for alabandite and water at 0.001 and 1, respectively). Dashed line shows stability limits for water at 1 atm pressure.

(A) Diagram of oxygen fugacity ( f O 2 ) vs. sulfur fugacity ( f S 2 ) at... Available to Purchase

Published: 01 September 2019
Fig. 6 (A) Diagram of oxygen fugacity ( f O 2 ) vs. sulfur fugacity ( f S 2 ) at 1 atm showing the superposition of stability fields of iron minerals (dashed lines) and manganese minerals at 400 K, according to Holland (1959) . The coexistence of alabandite and pyrrhotite at Morro da Mina
Image
Calculated sulfur fugacity (fS2) versus oxygen fugacity (fO2) based on fluid chemical analyses from the examined submarine hydrothermal vent sites (see text). Fluid data were taken from literature, as listed in Table DR3 (see footnote 1). Dashed lines depict isopotentials for 10 mM H2S in solution, using the following relation between fS2 and fO2: H2S(aq) + 0.5O2(g) = H2O(l) + 0.5S2(g). Solid lines were calculated for magnetite-pyrite equilibrium [3FeS2 + 2O2(g) = Fe3O4 + 3S2(g)]. Intercepts of these reaction lines were calculated using SUPCRT92 (Johnson et al., 1992).

Calculated sulfur fugacity ( f S 2 ) versus oxygen fugacity ( f O 2 ) b... Available to Purchase

Published: 01 August 2014
Figure 3. Calculated sulfur fugacity ( f S 2 ) versus oxygen fugacity ( f O 2 ) based on fluid chemical analyses from the examined submarine hydrothermal vent sites (see text). Fluid data were taken from literature, as listed in Table DR3 (see footnote 1 ). Dashed lines depict isopotentials
Image
Sulfur fugacity/temperature diagram with mineral reaction lines (black) and isolines of Fe concentrations in sphalerite (red). Sphalerites from the NNW–SEE veins and from the NE–SW veins are plotted on the basis of their average %FeS molar contents and of their GGIMFis temperatures. Labels: Apy = arsenopyrite, Bn = bornite, Ccp = chalcopyrite, Cv = covellite, Dg = digenite, Fe = native iron, Lo = löllingite, Po = pyrrhotite, Py = pyrite, Sp = sphalerite. Sample names as in Table 1. Modified after Einaudi et al. (2003).

Sulfur fugacity/temperature diagram with mineral reaction lines (black) and... Open Access

Published: 01 December 2024
Figure 13. Sulfur fugacity/temperature diagram with mineral reaction lines (black) and isolines of Fe concentrations in sphalerite (red). Sphalerites from the NNW–SEE veins and from the NE–SW veins are plotted on the basis of their average %FeS molar contents and of their GGIMFis temperatures
Image
Sulfur fugacity and temperature-dependent occurrence probability of gold in pyrite. (a–c) The Au occupation at Fe, S, and interstitial sites in pyrite, respectively. The dashed lines denote the contour line of sulfur fugacity (fS2), and the numbers on the dashed lines are the corresponding log fS2 in bars. The color gradients denote the occurrence probability of gold in the corresponding site. (Color online.)

Sulfur fugacity and temperature-dependent occurrence probability of gold in... Available to Purchase

Published: 03 January 2023
Figure 5. Sulfur fugacity and temperature-dependent occurrence probability of gold in pyrite. ( a–c ) The Au occupation at Fe, S, and interstitial sites in pyrite, respectively. The dashed lines denote the contour line of sulfur fugacity ( f S 2 ), and the numbers on the dashed lines
Image
Sulfur fugacity dependence on temperature for FeS–FeS2 (Wang and Salveson, 2005), and log fS2 estimations for different mineral associations with the pyrrhotite of different compositions and structures and/or pyrite that are typical for the Sovetskoe deposit. The associations are given in the order of their formation: 1, Asp + Po; 2, a, b, Au(950) + Po + Py; 3, Po + Asp + Ga + Sid; 4, Py + Po + Sid; 5, Py + Po + Ga + Au.

Sulfur fugacity dependence on temperature for FeS–FeS 2 ( Wang and Salveso... Available to Purchase

Published: 01 July 2019
Fig. 10. Sulfur fugacity dependence on temperature for FeS–FeS 2 ( Wang and Salveson, 2005 ), and log f S 2 estimations for different mineral associations with the pyrrhotite of different compositions and structures and/or pyrite that are typical for the Sovetskoe deposit. The associations
Image
Sulfur fugacity dependence on temperature for Fe–Au–Ag–S, and log fS2 and T estimations for different associations with pyrrhotite from the Sovetskoe deposit.

Sulfur fugacity dependence on temperature for Fe–Au–Ag–S, and log f S 2 ... Available to Purchase

Published: 01 July 2019
Fig. 11. Sulfur fugacity dependence on temperature for Fe–Au–Ag–S, and log f S 2 and T estimations for different associations with pyrrhotite from the Sovetskoe deposit.