为了研究金在黄铁矿表面沉淀的机理，于室温、常压，在氯化物溶液中进行了黄铁矿粉末吸附金的实验。在不同pH 的溶液中，黄铁矿均可吸附金，而且pH 值明显地影响吸附速率。扫描电镜观察表明，反应后黄铁矿粒表面有金晶体形成。XPS研究得知，黄铁矿光片与含金氯化物溶液反应后表面有Auo存在；硫在反应初期为S0、2-2 3 O S，随后转变为- 24SO，而铁成为Fe3+。黄铁矿中的Fe2+和-22S是溶液中金的还原剂。金在黄铁矿表面沉淀可能涉及吸附、还原和晶体生长等过程。

The interactions between andesine grains (0.25―0.45 mm) and NaCl and KCl+NaCl solutions were experimentally studied under flow-through conditions (flow rates of solution: 7 ml/h and 1 ml/h) at 300oC and 50 MPa. For comparison, corresponding static runs were performed at the same pressure and temperature. All of these experiments were carried out in a flexible gold cell hydrothermal apparatus. The emphasis of the present study was laid on the changes in the composition of solid surface and solution chemistry at the early stage of the interaction. After the reaction an appreciable amount of etch pits and crystallites of alkali-rich feldspar appeared on the surface of the andesine. The statistical treatment of the SEM/EDAX data for the surface of the mineral reacted showed an increase in the atomic ratio of Si/Al, (K+Na)/Ca and (K+Na)/Al and a decrease in the ratio of Ca/Al, compared with the starting andesine. During the interactions, pH of solutions increased and considerable amounts of Si and Ca were transferred into the aqueous phase. In the NaCl solution experiment at a flow rate of 7 ml/h, the variations of the Si, Al, Ca and K concentration with time were very distinct. The static or "low" flow rate (1 ml/h) reaction conditions and the presence of KCl in solution seemed to hinder the release of Si in andesine to aqueous solution. It is concluded that alkali-metasomatism of andesine at flow-through condition involves the dissolution of the mineral, and the formation of alkali-rich feldspar.

The carboxylate (formate, acetate, propionate and oxalate) and common inorganic anions (F-, Cl- and SO2-4) compositions for aqueous fluid inclusion leachates from 17 mineral samples collected from various deposits have been determined using ion chromatography in conjunction with microthermometric measurements on the fluid inclusions of their host minerals. The minerals, quartz, fluorite, barite, beryl and a fewore' minerals (wolframite, pyrite and galena), came from hydrothermal vein-type deposits in felsic igneous rocks or Archean metamorphic rocks. The results indicate that short-chain carboxylates are common components in hydrothermal fluids and can be present in considerable amounts. Formic acid (as formate) is the dominant species over other carboxylic acids. The present study raises new questions about the origin and geochemical significance of carboxylates in hydrothermal ore-forming processes.

In order to verify the presence of residual organic matter in some S-type granites, a method used conventionally in petroleum geochemistry for isolation of kerogen was employed to separate carbonaceous material (CM) from the Xihuashan granite, Jiangxi Prov., China. Optical, XRD and SEM/EDAX analyses identified the acid-insoluble residue as mainly composed of various mineral debris, with a minor carbonaceous fraction found in the residue. LMR and micro-FTIR studies showed that the residue contained a small amount of CM, which is heterogeneous in composition and structural state. The occurrence of CM in the granite implies that this granitic magma originated from sediments and crystallized at relatively lower temperatures and high pressures. This deduction is consistent with geological and geochemical studies of the Xihuashan granite. A tentative model was suggested which connects CM in S-type granite with organic matter in sedimentary rocks. The conditions under which CM can be preserved in S-type granite are discussed. The occurrence of some heavy hydrocarbons is expected in the Xihuashan granite.

利用石油地球化学的溶剂抽提技术和气相色谱技术研究了北京延庆碓臼峪花岗岩（深源花岗岩）样品中的可溶有机质，同时利用高温处理过的石英砂进行空白对比实验。结果表明，所研究的两个花岗岩样品中存在少量的高碳数或碳氢化合物，且具有相同的成分特征，这为自然界存在深源的长链或碳氢化合物提供了新的证据，也为解释花岗岩浆演化晚期水热流体中短链羧酸的成因提供了线索。