There are myriad reasons why we wish to understand the behavior of sulfur in magmatic systems, reasons that vary from pure intellectual curiosity to possible impacts on society and its resources. Since ancient times sulfur has been associated with volcanic activity, and the role of sulfur in the formation of ore deposits has long been recognized because of the necessity of metal ores for our modern life-style (e.g., Barnes 1979; Naldrett 1989; Simon and Ripley 2011, this volume). Recently the mechanisms and quantities of sulfur freed from natural magmas have become an important environmental issue due to...

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