Experimental Study of Sulfur Solubility in Silicate Melts Coexisting with Graphite as a Function of Silicate Melt Composition

Tsujimura, Tomoyuki; Kitakaze, Arashi

doi:10.1111/j.1751-3928.2005.tb00228.x

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…Figure 4 displays these observations from experimental data of Haughton et al (1974) and Tsujimura and Kitakaze (2005). The effect is best seen when a comparison is made between melt compositions that contain the same proportions of all elements but Fe, which varies between 0.2 to 25 wt % (Series 1, Fig.…”

Section: The Nonlinear Dependence Of Scss On Melt Feomentioning

confidence: 76%

“…Haughton et al (1974) experiments at 1,200°C, P = 1 atm, and constant fO 2 /fS 2 ratios (Series 1 includes runs on the same basalt with variable FeO contents and constant ratios for other oxides in the melt, whereas Series 2 represents synthetic systems with highly variable contents for all oxide components). Tsujimura and Kitakaze (2005) carried out their experiments on synthetic systems at 1,250°C and P = 1 kbar, equilibrating silicate melts with an excess of a sulfide phase. Sulfide-saturated MORB are from the Siqeuiros transform fault zone and ODP hole 896A (Figs.…”

Section: Main Assumptions Of the New Sulfide Solubility Modelmentioning

confidence: 99%

“…Our model is based on four main principles: (1) the "parabola-like" dependence of S solubility on melt FeO content, with a minimum at FeO ~3 to 4 wt % and high S solubility in ironenriched systems (e.g., Haughton et al, 1974;O'Neill and Mavrogenes, 2002;Tsujimura and Kitakaze, 2005), is a result of complexation reactions between sulfide species (FeS, S 2− ) and Fe 2+ ions in the silicate melt; (2) in tholeiitic compositions at temperatures <1,200°C, the effect of increasing Fe contents overwhelms that of the decreasing temperature, resulting in a negative correlation SCSS versus temperature (Fig. 1); (3) nickel has a pronounced effect on S solubility, causing significant variations in the onset of sulfide immiscibility in melts with similar major element compositions; and (4) the sulfidesilicate system can be described thermodynamically by (I) an ionic model of silicate melt components, assuming (as a first approximation) an ideal mixing of cations and positively charged Fe-Ni-sulfur clusters, and (II) a regular solution model for the coexisting Fe-Ni sulfide liquid.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Solubility of Fe-Ni Sulfides in Basaltic Magmas: The Effect of Nickel

Ariskin¹,

Danyushevsky²,

Bychkov³

et al. 2013

Economic Geology

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A new model of sulfur solubility in mafic and/or ultramafic silicate magmas, which accounts for the effects of pressure, temperature, oxygen fugacity, major element, and Ni contents in the silicate melt and the coexisting sulfide liquid, is presented in this paper. The model postulates the existence of positively charged Fe-Ni sulfide complexes in the melt of a general formula (FeyNi1-y)zS 2(z-1)+ , which are formed as a result of complexation reactions between the sulfide-forming ions (Fe 2+ , Ni 2+ , S 2− ) and (Fe,Ni)S species in the silicate liquid. The new model can explain both the anomalously high S solubility in iron-enriched silicate systems and the "parabolalike" dependence of S contents in silicate melts on their Fe content. The proposed mechanism of sulfide solubility was calibrated on a dataset of 213 anhydrous experimental glasses (both Ni free and Ni bearing) and 53 S-saturated MORB glasses, and incorporated into a new version of the COMAGMAT (v. 5) magma crystallization model. The COMAGMAT-5 model can estimate sulfur concentration at sulfide saturation (SCSS) in a wide range of experimental and natural compositions, including Fe/Ni variations in silicate melts and coexisting sulfides. Despite relatively low concentrations, nickel is shown to have a pronounced effect on S solubility, causing significant variations in the onset of sulfide immiscibility in melts with otherwise similar major element compositions. An application example of the new SCSS model to "B-1 magma" proposed as parent for the Lower and Lower Critical zones of the Rustenburg Layered Suite, Bushveld Complex, is discussed.

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Section: The Nonlinear Dependence Of Scss On Melt Feomentioning

confidence: 76%

Section: Main Assumptions Of the New Sulfide Solubility Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling Solubility of Fe-Ni Sulfides in Basaltic Magmas: The Effect of Nickel

Ariskin¹,

Danyushevsky²,

Bychkov³

et al. 2013

Economic Geology

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“…O'Neill & Mavrogenes (2002) did not demonstrate the low-FeO limb of the U-shaped dependence experimentally, because the high f S 2 required to achieve FeS saturation at low FeO cannot be accessed in 1 atm experiments as partial pressures of S 2 greater than 1 bar are necessary. Limited experimental demonstration [an exception is the study by Tsujimura & Kitakaze (2005)] may help explain why the thermodynamic basis of SCSS has been ignored in favour of empirical parameterization of the available experimental data (e.g. Li & Ripley, 2005Liu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

The Effect of FeO on the Sulfur Content at Sulfide Saturation (SCSS) and the Selenium Content at Selenide Saturation of Silicate Melts

2015

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The concentration of sulfur in basalt-like silicate melts as S 2is limited to the amount at which the melt becomes saturated with a sulfide phase, such as an immiscible sulfide melt. The limiting solubility is called the 'sulfur content at sulfide saturation' (SCSS). Thermodynamic modelling shows that the SCSS depends on the FeO content of the silicate melt from two terms, one with a negative dependence that comes from the activity of FeO in the silicate melt, and the other with a positive dependence that comes from the strong dependence of the sulfide capacity of the melt (C S ) on FeO content. The interaction between these two terms should yield a net SCSS that has an asymmetric U-shaped dependence on the FeO content of the melt, if other variables are kept constant. We have tested this thermodynamic model in a series of experiments at 1400 C and 1Á5 GPa to determine the sulfur contents at saturation with liquid FeS in melt compositions along the binary join between a haplobasaltic composition and FeO. The SCSS is confirmed to have the asymmetric U-shaped dependence, with a minimum at $5 wt % FeO. The effect of FeO on the selenide content at selenide saturation (SeCSeS) was investigated in an analogous fashion. SeCSeS shows a similar, though not identical, U-shaped dependence, implying that the solubility mechanism of selenide in basaltlike silicate melts is similar to that of sulfide. The observation of increasing SCSS with decreasing FeO in hydrous silicic melts was explored by inverse modelling of datasets from pyrrhotitesaturated hydrous silicic liquids, revealing that high SCSS at low FeO can be explained in terms of the low-FeO limb of the 'U', rather than dissolution of sulfur as hydrous species such as H 2 S or HS -. Recent measurements of the composition of the surface of Mercury prompted examination of the high-SCSS, low-FeO limb of the 'U' as a potential explanation for the sulfur-rich but Fe-poor surface of Mercury.

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“…Instead, a decreasing Fe content is consistent with lowering the level of sulfur concentration at sulfide saturation (SCSS; Haughton et al, 1974;O'Neill and Mavrogenes, 2002;Tsujimura and Kitakaze, 2005;Ariskin et al, 2013), and could play a major role for sulfide precipitation from percolating melt. Iron loss is likely efficient in narrow melt channels (Ciazela et al, 2017b), where Fe in melt is buffered by the exchange reaction with large amount of olivine and pyroxene on conduit walls (Dick and Natland, 1996).…”

Section: Mechanism Of Melt Refertilizationmentioning

confidence: 97%

Sulfide enrichment at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR)

Ciążela

Koepke

Dick

et al. 2018

Geochimica et Cosmochimica Acta

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ABSTRACT:The Kane Megamullion oceanic core complex located along the Mid-Atlantic Ridge (23°30'N, 45°20'W) exposes lower crust and upper mantle directly on the ocean floor. We studied chalcophile elements and sulfides in the ultramafic and mafic rocks of the crust-mantle transition and the mantle underneath. We determined mineralogical and elemental composition and the Cu isotope composition of the respective sulfides along with the mineralogical and elemental composition of the respective serpentines. The rocks of the crust-mantle transition zone (i.e., plagioclase harzburgite, peridotite-gabbro contacts, and dunite) overlaid by troctolites are by one order of magnitude enriched in several chalcophile elements with respect to the spinel harzburgites of the mantle beneath. Whereas the range of Cu concentrations in spinel harzburgites is 7-69 ppm, the Cu concentrations are highly elevated in plagioclase harzburgites with a range of 90-209 ppm. The zones of the peridotite-gabbro contacts are even 2 more enriched, exhibiting up to 305 ppm Cu and highly elevated concentrations of As, Zn, Ga, Sb and Tl.High Cu concentrations show pronounced correlation with bulk S concentrations at the crust-mantle transition zone implying an enrichment process in this horizon of the oceanic lithosphere. We interpret this enrichment as related to melt-mantle reaction, which is extensive in crust-mantle transition zones. In spite of the ubiquitous serpentinization of primary rocks, we found magmatic chalcopyrites [CuFeS 2 ] as inclusions in plagioclase as well as associated with pentlandite [(Fe,Ni) indicate that the metal enrichment, increased sulfide modes, and potentially formation of small sulfide deposits could be expected globally along the petrological Moho.

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Experimental Study of Sulfur Solubility in Silicate Melts Coexisting with Graphite as a Function of Silicate Melt Composition

Cited by 6 publications

References 18 publications

Modeling Solubility of Fe-Ni Sulfides in Basaltic Magmas: The Effect of Nickel

Modeling Solubility of Fe-Ni Sulfides in Basaltic Magmas: The Effect of Nickel

The Effect of FeO on the Sulfur Content at Sulfide Saturation (SCSS) and the Selenium Content at Selenide Saturation of Silicate Melts

Sulfide enrichment at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR)

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