Solubility of sulfur in some magmas at 1 atmosphere

Katsura, Takashi; Nagashima, Shigeru

doi:10.1016/0016-7037(74)90038-6

Cited by 155 publications

(98 citation statements)

References 25 publications

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“…2) and the abundance of sulfides, as well as Fe-Ti oxides, are consistent with formation from an evolved silicate melt. Factors affecting the sulfur content of basaltic melts include temperature, pressure, f θ2 , and melt composition, with the solubility of sulfur increasing significantly as iron content increases (Haughton et al, 1974;Katsura and Nagashima, 1974;Carroll and Rutherford, 1985). The oxide gabbros of T contents, ranging up to about 25 wt% (Shipboard Scientific Party, 1989).…”

Section: Distribution Of Igneous Sulfides and Sulfurmentioning

confidence: 99%

“…In some cases, δ 34 S of sulfide increases with differentiation in mafic intrusions, whereas in others no clear trend is evident, or δ 34 S may decrease in more differentiated rocks (Thode et al, 1962;Shima et al, 1963;Sasaki, 1969aSasaki, , 1969b. Slight variations in oxygen and sulfur fugacities implied by the presence or absence of igneous troilite in Hole 735B rocks could affect the speciation of sulfur in the melt (Katsura and Nagashima, 1974;Ueda and Sakai, 1984), consequently resulting in slight vari- Thode et al, 1962;Shima et al, 1963;Sasaki, 1969aSasaki, , 1969bSasaki and Ishihara, 1977). For Japan data, I = ilmenite series; M = magnetite series.…”

Section: Sulfur Isotopesmentioning

confidence: 99%

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Mineralogy and Isotopic Composition of Sulfur in Layer 3 Gabbros from the Indian Ocean, Hole 735B

Alt

Anderson²

1991

Proceedings of the Ocean Drilling Program

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Sulfide mineralogy, sulfur contents, and sulfur isotopic compositions were determined for samples from the 500-m gabbroic section of Ocean Drilling Program Hole 735B in the southwest Indian Ocean. Igneous sulfides (pyrrhotite, chalcopyrite, pentlandite, and troilite) formed by accumulation of immiscible sulfide droplets and crystallization from intercumulus liquids. Primary sulfur contents average around 600 ppm, with a mean sulfide δ 34 S value near O‰, similar to the isotopic composition of sulfur in mid-ocean ridge basalt glass. Rocks from a 48-m interval of oxide gabbros have much higher sulfur contents (1090-2530 ppm S) due to the increased solubility of sulfur in Fe-rich melts. Rocks that were locally affected by early dynamothermal metamorphism (e.g., the upper 40 m of the core) have lost sulfur, averaging only 90 ppm S. Samples from the upper 200 m of the core, which underwent subsequent hydrothermal alteration, also lost sulfur and contain an average of 300 ppm S. Monosulfide minerals in some of the latter have elevated δ 34 S values (up to +6.9‰), suggesting local incorporation of seawater-derived sulfur. Secondary sulfides (pyrrhotite, chalcopyrite, pentlandite, troilite, and pyrite) are ubiquitous in trace amounts throughout the core, particularly in altered olivine and in green amphibole. Pyrite also locally replaces igneous pyrrhotite. Rocks containing secondary pyrite associated with late low-temperature smectitic alteration have low δ 34 S values for pyrite sulfur (to -16.6%c). These low values are attributed to isotopic fractionation produced during partial oxidation of igneous sulfides by cold seawater. The rocks contain small amounts of soluble sulfate (6% of total S), which is composed of variable proportions of seawater sulfate and oxidized igneous sulfur. The ultimate effect of secondary processes on layer 3 gabbros is a loss of sulfur to hydrothermal fluids, with little or no net change in 5 34 S.

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Section: Distribution Of Igneous Sulfides and Sulfurmentioning

confidence: 99%

Section: Sulfur Isotopesmentioning

confidence: 99%

Mineralogy and Isotopic Composition of Sulfur in Layer 3 Gabbros from the Indian Ocean, Hole 735B

Alt

Anderson²

1991

Proceedings of the Ocean Drilling Program

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“…Other investigations of submarine basalts (Kanehira et al, 1973;Mathez, 1976) and Hawaiian lavas (Desborough et al, 1968) have given similar results. Experimental data (Katsura and Nagashima, 1974;Carrol and Rutherford, 1985) and the natural occurrence of sulfate in basalts (Schneider, 1970;Sakai et al, 1982Sakai et al, , 1984 suggest that the distribution of sulfur between sulfate and sulfide in igneous rocks depends on the oxygen fugacity. At an oxidation state close to QFM, the sulfide is dominant relative to sulfate in a hydrous silicate magma; however, at a higher oxygen fugacity (MNO, HM), anhydrite is a stable phase and the melt is sulfate dominant (Carrol and Rutherford, 1985).…”

Section: Discussionmentioning

confidence: 99%

Sulfur Isotope Ratios of Leg 126 Igneous Rocks

Torsser¹

1992

Proceedings of the Ocean Drilling Program

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Sulfur isotope ratios have been determined in 19 selected igneous rocks from Leg 126. The δ 34 S of the analyzed rocks ranges from -0.1 o/ 00 to +19.60 o/oo. The overall variation in sulfur isotope composition of the rocks is caused by varying degrees of seawater alteration. Most of the samples are altered by seawater and only five of them are considered to have maintained their magmatic sulfur isotope composition. These samples are all from the backarc sites and have δ 34 S values varying from +0.2 o/oo to +1.6 o/oo , of which the high δ 34 S values suggest that the earliest magmas in the rift are more arc-like in their sulfur isotope composition than the later magmas. The δ 34 S values from the forearc sites are similar to or heavier than the sulfur isotope composition of the present arc.

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“…The low solubility of sul fur in silicate melt (e.g., Katsura and Nagashima, 1974) excludes sulfide materials from magmas. Sulfide melt has higher density than silicate melt and the sulfide phase sinks relatively to the sili cates melt.…”

Section: Factors For Volatilesmentioning

confidence: 99%

Multivariate analysis of Japanese volcanic rocks: Volatile and major elements.

Anazawa

Yoshida

1996

Geochem. J.

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Tokyo152, JapanFour types of multivariate procedures (principal components analysis (PCA), factor analysis (FA), cluster analysis and multiple regression analysis (MR)) were applied to find the relationship between volatile contents and genesis of Japanese volcanic rocks. Twelve major elements and seven volatile minor elements were considered on 44 rock samples obtained from various areas of Japan. The variation in the data was demonstrated by 5 components and 5 common factors in PCA and FA, respectively. The first factor implies similar behavior among the major elements; the second factor represents the contribution of seawater to magma genesis; the third factor corresponds to the contribution of the mantle component; the fourth factor suggests separation of sulfide phase from silicate phase; and the fifth factor shows the contribution of sedimentary materials to magma genesis. INTRODUCTION A knowledge of the volatile behavior in vol canic rocks is of great value for understanding magma genesis in subduction zones. However, little work on volatile contents in volcanic rocks has been done because of the difficulty in the analytical technique and the difficulty in estimat ing the original concentration in magmas. Yoshida and his co-workers gave analytical data on F, Cl, Br, I (Yoshida et al., 1971; Yoshida, unpub lished), S (Arikawa, 1987;Hong, 1988) and B (Isozaki et al., 1973). These works were investi gated on respective element individually or were applied elementary statistics on only two or three elements simultaneously. Further work on the synthetic correlation structure among these ele ments was awaited. In the previous work, we studied the multivariate analysis on these six ele ments to understand their behaviors and found the usefulness of the method (Anazawa and Yoshida, 1994).Multivariate analysis allows us to consider changes in several properties simultaneously and is not affected by the number of objects being studied. This group of statistical methods is very powerful, but only limited examples on geo chemical data have been reported, because of its complicated theoretical strategy and operational methodology.In the previous report, we examined six volatiles and found that these elements form three groups by their correlation: (1) Cl, Br and B; (2) F and S; (3) I (iodine). The obtained factor struc ture, however, contained the possibility of chang ing the characteristics with additional variables for lacking of data such as major element concentra tions. (personal communication, 1991) in our research group determined arsenic for 50 Japanese volcanic rocks. He, however, could not find the correlation between As and S. Instead, he suggested a high correlation between As and B. Because of this considerable interest in As properties, we took As analytical data for the application of statistical analysis.In the present report, we describe new findings from multivariate analysis on 44 samples for 12 major and 7 volatile minor elements. The purpose of the present work is, (1) to find the factor str...

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Solubility of sulfur in some magmas at 1 atmosphere

Cited by 155 publications

References 25 publications

Mineralogy and Isotopic Composition of Sulfur in Layer 3 Gabbros from the Indian Ocean, Hole 735B

Mineralogy and Isotopic Composition of Sulfur in Layer 3 Gabbros from the Indian Ocean, Hole 735B

Sulfur Isotope Ratios of Leg 126 Igneous Rocks

Multivariate analysis of Japanese volcanic rocks: Volatile and major elements.

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