The Xihuashan, Dangping and Piaotang deposits in the Jiangxi Province, south China can be considered as typical high-temperature hydrothermal quartz vein-type W-Sn mineralization, that is temporally and spatially related to Mesozoic S-type granite. Microthermometric studies of fluid inclusions in various minerals from these deposits were conducted to obtain homogenization temperature and salinity data. Major organic and inorganic aqueous components of the fluid inclusions were extracted by a crush-leaching, and concentrations of short-chain carboxylate (formate, acetate, propionate, oxalate), fluoride, chloride and sulfate anions in the leachates were determined using ion chromatography. The results indicate the presence of formate and acetate as well as minor amounts of oxalate and propionate in leachates, and the dominance of formate over other carboxylates. The molar ratio of acetate to formate appears to be a potential indicator of the redox state for the ore fluid system. Oxygen and hydrogen isotopic data show that inclusion water in quartz is mainly magmatic in origin. It is postulated that the dissolved carboxylate anions in the ore fluids for the deposits probably were generated by the breakdown of kerogen in "primitive sedimentary rocks" during the formation of S-type granites. The possibility of inorganic synthesis of the carboxylate species in a C-H-O system can not be excluded.

本文于300℃，500bar时，用金袋式热液设备测定了MH（磁铁矿+赤铁矿）缓冲组合在HCl水溶液中的溶解度。计算了热水溶液中离子的活度，并用岭回归和叠代的方法处理实验数据，与多种可能的Fe存在形式模型拟合。结果表明，实验溶液中的Fe主要成FeOH+存在。求得MH组合溶解反应的平衡常数K=57.161。计算了0f,FeOH+ΔG＝260.3kJ/mol。300℃时，在地质上可能的pH和氯化物浓度条件下，热液中的Fe主要成羟络合物存在。

Yugawaralite (CaAl2Si6O16.4H2O) occurs most commonly in active geothermal areas and is associated with other zeolites including laumontite and wairakite. The stability field of yugawaralite was experimentally investigated using conventional hydrothermal apparatus over a p-T range of 200-350℃ and 0.25―2 kbar and run duration of 14 to 61 days. The reversal experiments indicate that the p-T curve of the reaction yugawaralite = wairakite + 2SiO2 + 2H2O passes through 225±5℃ at 0.25 kbar, 233±5℃ at 0.5 kbar, 238±5℃ at 1 kbar and 245±5℃ at 2 kbar pfluid. The thermodynamic parameters of yugawaralite were calculated: 0 ΔSf = -2175.46±12.01 J/mol-K, 0 f ΔG = -8387.69±4.01 kJ/mol, 0 f ΔH =-9036.19±4.01 kJ/mol. The equilibrium curve, yugawaralite = laumontite + 2SiO2, was estimated by employing the thermodynamic data and the calculated slope of 31.3 bars/℃. Present and previous experiments define an invariant point where yugawaralite, wairakite and laumontite are stable. The invariant point was located at 234℃ and 550 bars in experimental conditions where H2O p =ptotal. In geothermal systems where H2O p is about 1/3 H2O p, the occurrence of yugawaralite is restricted to depths not much greater than 0.5 km. This result is consistent with its limited occurrence in active geothermal areas.