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硫是一种变价元素,在不同的物理化学系统中,形成各种不同价态的含硫化合物。由于各种含硫化合物之间存在着明显的硫同位素分馏效应,热液矿物的硫同位素组成通常不同于成矿溶液的全流平均同位素组成(δS_(∑s)~(34)),H.Ohmoto(1972)指出,在同位素平衡条件下,矿物的硫同位素组成是热液溶液pH、fo_2,温度,离子强度及全硫平均同位素组成的函数。因此,热液矿物的硫同位素资料可以用来解释成矿的物理化学条件和硫源。矿床硫同位素研究的主要任务之一是确定成矿溶液的全硫平均同位素组成,它是判断硫
Sulfur is a variable-value element that forms a variety of sulfur-containing compounds in different valence states in different physicochemical systems. The sulfur isotopic composition of hydrothermal minerals is usually different from that of ore-forming solution (δS_ (Σs) ~ (34)) due to the obvious sulfur isotopic fractionation among various sulfur compounds. Ohmoto (1972) pointed out that under isotope equilibrium conditions, the sulfur isotope composition of minerals is a function of hydrothermal solution pH, fo_2, temperature, ionic strength and the average sulfur isotope composition. Therefore, the sulfur isotope data of hydrothermal minerals can be used to explain the physico-chemical conditions and sulfur sources of mineralization. One of the main tasks in the study of sulfur isotopes is to determine the average sulfur isotopic composition of the ore-forming solution.