水热成矿流体中的短链羧酸

文中简述了天然水流体中的短链羧酸产出状况。短链羧酸地球化学的研究目前集中于沉积盆地和表生环境。根据C H O体系中某些C H O化合物的化学关系和热力学分析 ,推测深部水热流体中有可能存在短链羧酸。研究高温热液矿床矿物流体包裹体的水溶有机组分可能是检验这一推测的突破口。某些石英脉型热液矿床的矿物流体包裹体压碎浸取和离子色谱分析确定 ,成矿流体中存在少量短链羧酸 ,而且甲酸是优势物种。文章讨论了矿物包裹体浸取实验结果需要进一步探讨的问题 ,认为研究水热成矿流体短链羧酸地球化学具有重要的理论意义。

SHORT-CHAIN CARBOXYLATES IN HYDROTHERMAL ORE FLUIDS

The occurrences of short chain carboxylates in natural fluids are briefly described in this paper. At present, geochemistry of carboxylic acids has been mainly studied in sedimentary and surface environments. The presence of short chain carboxylates in deep hydrothermal fluids can be expected in the light of the chemographic relations of some C H O compounds in the system of C H O and thermodynamic analysis. The determination of aqueous organic components in fluid inclusions of minerals from high temperature hydrothermal deposits is a possible breakthrough point to examine this inference. Crush leaching and ion chromatographic analysis of fluid inclusions in minerals from some quartz vein hydrothermal deposits show that small amounts of formate and acetate are present in most ore fluids and that formate is a dominant species. Some problems involving in crush leaching experiment results are discussed, which need to be further investigated. The geochemical significance of short chain carboxylates in hydrothermal fluids is worth notice.