Abstract
Sulfide–silicate immiscibility (liquation) in silicate melts has a significant influence on the behavior of chalcophile elements in magmatic processes as the main mechanism of the formation of sulfide deposits of nonferrous and precious metals. It is important to know the solubility of sulfur in magmas of different compositions in dependence on the physicochemical parameters in order to reveal the conditions of sul� fide–silicate immiscibility. Among these parameters, the main role belongs to oxygen fugacity f(O2), which varies within a broad range in magmatic systems. The influence of f(O2) on sulfur solubility in model and natural anhydrous sili� cate melts of basaltic composition with O–S fluid at atmospheric pressure is discussed in numerous papers, the results of which are summarized in reviews [2, 3] and demonstrated in Fig. 1. The extreme character of sulfur solubility in dependence on f(O2) with a mini� mal solubility in the area of the quartz–fayalite–mag� netite (QFM) buffer is established. There is a negative dependency under reduced conditions and a positive dependency under the oxidized conditions on f(O2). Sulfur solubility increases with temperature, f(S 2 ), melt basicity, and FeO concentration in the melt. There are limited data on the influence of volatile components (H2O, H2O + CO2) and pressure on sulfur solubility in magmas [4, 5], but the influence of f(O2)
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