Experiments performed at 2 kbar, in the temperature range 800–1000°C, with fO2 between NNO−2·3 and NNO+2·9 (where NNO is the nickel–nickel oxide buffer), and varying amounts of sulphur added to hydrous metaluminous rhyolite bulk compositions, were used to constrain the solubility of sulphur in rhyolite melts. The results show that fS2 exerts a dominant control on the sulphur solubility in hydrous silicate melts and that, depending on fO2, a rhyolitic melt can reach sulphur contents close to 1000 ppm at high fS2. At fO2 below NNO+1, the addition of iron to a sulphur-bearing rhyolite magma produces massive crystallization of pyrrhotite and does not enhance the sulphur solubility of the melt. For a given fO2, the melt-sulphur-content increases with fS2. For fixed fO2 and fS2, temperature exerts a positive control on sulphur solubilities, at least for fO2 below NNO+1. The mole fraction of dissolved sulphur exhibits essentially linear dependence on fH2S at low fO2 and, although the experimental evidence is less clear, on fSO2 at high fO2. The minimum in sulphur solubility corresponds to the redox range where both fH2S and fSO2 are approximately equal. A thermodynamic model of sulphur solubility in hydrous rhyolite melts is derived assuming that total dissolved sulphur results from the additive effects of H2S and SO2 dissolution reactions. The model reproduces well the minimum of sulphur solubility at around NNO+1, in addition to the variation of the sulphide to sulphate ratio with fO2. A simple empirical model of sulphur solubility in rhyolitic melts is derived, and shows good correspondence between model and observations for high-silica rhyolites.

B. CLEMENTE

Journal of Petrology

《岩石学杂志》为在火成岩和变质岩石学和岩石发生的广泛领域发表高质量研究提供了一个国际论坛。发表的论文涵盖了主量元素、微量元素和同位素地球化学以及应用于岩石成因的年代学等领域的广泛主题；实验岩石学；岩浆生成、分化和就位过程；成岩矿物及其共生的定量研究；有助于解决基本岩石学问题的火成岩和变质岩的区域研究；岩石成因过程的理论模型。

The Journal of Petrology serves as an international forum for publishing high-quality research in the broad fields of igneous and metamorphic petrology and rock formation. The published papers cover a wide range of topics, including major and trace element geochemistry, isotopic studies, and geochronology applied to rock genesis; experimental petrology; processes of magma generation, differentiation, and emplacement; quantitative studies of diagenetic minerals and their associations; regional studies of igneous and metamorphic rocks that contribute to solving fundamental petrological issues; and theoretical models of rock formation processes.

《Journal of Petrology》是一个国际论坛，致力于发表关于火成岩和变质岩石学及其形成过程的高质量研究。该期刊涵盖了多个领域的主题，包括主量元素、微量元素和同位素地球化学，以及应用于岩石成因的年代学；实验岩石学；岩浆生成、分化和就位过程；成岩矿物及其共生的定量研究；以及有助于解决基本岩石学问题的火成岩和变质岩的区域研究。此外，期刊还探讨岩石成因过程的理论模型。

Category	Quartile
地球科学	2
地球科学, 地球化学与地球物理	2

The Solubility of Sulphur in Hydrous Rhyolitic Melts

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Journal Info

Category	Quartile
GEOCHEMISTRY & GEOPHYSICS	1