The solubility of the buffer assemblage magnetite+hematite in 0.10, 1.00 and 3.00 mol/kg NaCl solutions with various pH values was determined by use of a Dickson gold cell hydrotherma1 apparatus at 300℃ and 500 bars. Activities of H+ and Cl-in the NaCl hydrothermal solution for each determination were approximated. The experimental results show that the solubility is strongly dependent on the pH of the solutions and appears to have no explicit relation to NaCl molality in acidic solutions. The correlation of the measured solubility with pH at 300℃ suggests a change in Fe speciation in solution at pH≈5.3-5.4. Treatment of the experimental data by a ridge regressions program and an iterative procedure indicates that the dominant species in solution under the run condition are FeOH+, Fe(OH)3Cl-, Fe(OH)03 and Fe(OH)-4. Gibbs free energy of formation for these species at 300℃ and 500 bars were derived: 0ΔGf,FeOH+=-250.4 kJ/mol; ΔG0f,Fe(OH)3Cl−=-644.7 kJ/mol; ΔG0f,FeOH03=-552.6 kJ/mol; and ΔG0f,FeOH-4=-652.7 kJ/mol. The Present study demonstrates that the change in acidity of hydrothermal ore-forming solutions exerts an important influence on the transport and deposition of Fe in nature.

为了考察石英表面特征对金沉淀的影响，于20―200℃使不同切向的石英晶体光片与含金氯化物溶液相互作用。反应前后石英光片表面的SEM/EDAX、XPS和反光显微镜研究表明，所有实验中均发现金在石英表面沉淀。结合显露石英位错的浸蚀实验，发现沉淀的金晶体在石英表面的分不死守石英晶体中存在的线性缺陷控制。本文分析了本实验研究结果与前人工作的差异，讨论了金的沉淀机理和含金石英脉中金的不均匀分布。

于MnCl2-Na2B4O7（或NaB（OH）4-H2O）体系中进行锰方硼石（Chambersite）的合成实验研究，合成相用X射线衍射法和扫描电镜法鉴定。200℃和500巴条件下（2-10天）形成锰方硼石、羟锰方硼石（Mn3B7O13OH）和硼锰矿（MnBO2OH）；在110℃和溶液蒸汽压力下（30天）得到锰方硼石、羟锰方硼石和两个未知的锰硼酸盐。200℃、酸性溶液中（pH<5.2）锰方硼石易于结晶，而在碱性溶液中（pH>9.5）硼锰矿是惟一的合成相，文献中尚未见有关该矿物合成的报道。据本实验研究结果推测自然界锰方硼石的形成为一两步骤过程。第一步，在沉积环境中锰盐溶液与含硼溶液反应形成锰硼酸盐；第二步，在沉积后阶段由于物理化学条件的变化，早期形成的锰硼酸盐在酸性、富氯和较高的温度下转变为锰方硼石。论文作者推测，河北蓟县锰方硼石-硼锰矿组合的产出指示它们的形成温度应高于110℃和介质pH 在5.2-7.5之间。

于500℃和1•108 Pa条件下，利用冷封口高温高压水热系统和焊封金管技术实验研究了黑云母和Na-Ca-氯化物溶液的相互作用，着重考察反应不同时间的黑云母表面和溶液化学的变化。黑云母中的K、Fe和Si不同程度地进入溶液相，而溶液中原有的Na和Ca含量降低；SEM/EDAX和EMAX研究表明，反应后的黑云母边缘部分明显失去K和Fe，但得到相当数量的H2O和一些Ca。黑云母中Fe活化的控制反应可能是H+交代作用。

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.