东风山前寒武纪含铁建造金矿床的同位素地球化学特征

东风山金矿体赋存在含铁层之下的东风山群角岩层中。赋矿层位中富含磁黄铁矿、黄铁矿、锰铝榴石和锰铁闪石。通过对该矿床的硫、氧、碳和铅同位素研究,表明硫化物中的硫和地层铅主要来自深源,其次地层中的含硫有机物被生物分解形成的硫也产生一定影响。东风山群形成于早元古代。东风山金矿属高温热接触变质的同生床。     

化学法制备纳米粉的热力学条件

阐明了化学法制备纳米粉的热力学条件,以及如何借助于材料的腐蚀状态图（Ｅ－ｐＨ图）确定沉淀成胶条件。试验结果表明,这种方法具有简单、直观、快捷等优点, 不但可以方便地确定单组分沉淀成胶条件, 而且对多组分共沉淀条件的确定更具有其优越性, 为化学法制粉提供了理论依据。     

中山沟金矿床地质特征

论述了中山沟金矿成矿基本特征,研究了矿床流体包裹体特征,并测定了成矿温度、压力、密度、盐度等参数。     

Two kinds of Carlin-type gold deposite in southwestern Guizhou, China

Based on the organic geochemical studies on two typical Carlin-type deposits in southwestern Guizhou, as well as the comparison between the two deposits in terms of geological background, igneous rock, paleo-oilfield, lithofacies and paleogeographical and geochemical features, two kinds of Carlin-type deposit were proposed: Lannigou Type and Getang Type. The former includes Lannigou, Banqi and Yata gold deposits. These deposits are hosted by turbidite, geographically situated in the southwest of the mineralized district, and related genetically to paleo-oilfields. The latter includes Getang, Zimudang and Dachang gold (mercury and thallium) deposits, situated geographically in the northwest of the mineralized district where Emeishan basalt commonly occurs. These deposits are associated with reduction of coaly organic matter.     

Silicification and mineralization in hydrothermal deposits

In hydrothermal deposits there are many types of alteration, including potassic alteration (altered minerals are potassic feldspar and biotite), sericitization, silicification, argillazation, chloritiza-tion, carbonification and propylitization, but most of them belong to post- or premineralization alteration except silicification formed during the mineralization period. Silicifation occurred in hydrothermal deposit formation from high, moderate temperature to low temperature and can be divided into early, middle and middle-late stages. The early stage is featured by formation under high temperature and accompanied by mineralization of Sn, W and Mo, while the middle stage was formed under moderate temperature and related to mineralization of Cu. The middle-late stage is characterized by moderate-low temperature and varied mineralization of Cu, Au, Zn, Ag, Pb and U.     

The characteristics and recognition of internal-tide and internal-wave deposits

Internal-tide and internal-wave deposits are a new and important type of deep-water traction-current deposits. Based on an analysis of documented internal-tide and internal-wave deposits, five facies types can be recognized: ( i ) bidirectional cross-laminated sandstone fades, ( ii ) unidirectional cross-bedded and cross-laminated sandstone facies, ( Ⅲ ) rhythmic alternating sandstone facies and mudstone, (iv ) flaser, wavy and lenticular bedded foraminiferal limestone facies, (v ) sandy oolitic limestone facies with flaser, wavy and lenticular bedding and epsilon cross bedding, which formed in submarine channel, unchannelized continental slope and plateau environments respectively. Accoding to the available data and knowledge, three sedimentation models are built; some discriminating characteristics of internal-tide and internal-wave deposits, and the distinction between them and contourites and turbidites are summed up.