典型高温热泉中锑的形态分布及其地球化学成因
摘要
Antimony is a typical harmful element, and the negative environmental effects of antimony-rich hot springs discharge can not be neglected since geothermal genesis of antimony is an important source of antimony in the natural water environments.In this paper, the morphological distribution of antimony in hot springs and its geochemical genesis were analyzed in selected typical geothermal areas in southern Tibet and western Yunnan.In general, the antimony of geothermal water discharged from the study area can be up to 2 128.7 μg/L, which is much higher than the background values in the natural water environments.Hydrogeochemical calculations indicate that the main forms of antimony present in the hot springs are antimonate and antimonite, however, the percentage of thioantimony in some hot spring samples can be as high as 35% of the total antimony.Sulfide concentration, S(-II)/Sb molar ratio, and competitive thiolation between arsenic and antimony are the key factors affecting the content of thioantimony in hot springs.Among the geothermal systems involved in this study, the Tibetan MapamYumco, Moincer, and Moluojiang are magma-heat geothermal systems, and the antimony in the geothermal water originates from the input of fluids released from the hot storage surrounding rocks leaching and magma house as the heat source under high temperature 基金项目： 国家自然科学基金项目(Nos.