鄂西北银洞沟铅锌-银矿床的流体包裹体研究

本文研究银洞沟铅锌-银矿床流体包裹体的特征、均一温度、盐度和流体成分,对矿床形成的温度、压力、矿化流体性质及其演化规律等成因问题作出了解释。     

汉诺坝含超镁铁质岩包体的碱性玄武岩微量元素地球化学

采用仪器中子活化分析法和X射线荧光光谱法,系统地测定了汉诺坝含超镁铁质岩包体的碱性玄武岩微量元素含量。应用平衡部分熔融和瑞利分离结晶作用模式,讨论了该岩套的成岩过程及其地幔源区的地球化学特征。     

模式识别技术在矿床铁帽评价中的应用

应用模式识别技术中主成分分析、非线性映照及最小生成树法,对取自我国各地90个铁帽样本进行判别分类。分析铁帽样本化学组分含量(MnO,P_2O_5,S,Cu,Zn,Pb,Ni,Co,Ag,Ba,Sr,Cr等),取其数据张成为多维空间。在模式空间中,三类铁帽样本(分属氧化物矿床、硫化物矿床及菱铁矿矿床)分布在不同区域,分类正确率达96％,预报了25个铁帽样本的属性,经相分析证实是正确的。这一方法根据地表浅层样品分析数据判断地下矿床种类,为有色金属找矿提供了有用的信息。     

磁法勘探在新疆尉犁县且干布拉克蛭石、磷灰石矿床普查评价中的应用效果

尉犁县且干布拉克蛭石矿为特大型,磷灰石矿为大型.蛭石、磷灰石均赋存于磁性较强的透辉石岩及超基性岩中,矿体与围岩间有较明显的磁性差异,含矿母岩70%被第四系覆盖.利用地面磁测,较好地圈定了含矿母岩的边界,提供了含矿体的平面形态及产状,为勘查缩小了靶区.磁法勘探不仅是直接找磁铁矿床及某些有关金属矿床的有效方法,而且在间接寻找非金属矿床上亦能发挥作用.     

Experimental Studies of the Solubility of Cassiterite and the Extraction of Tin from Granitic Melts

Experiments indicate that the solubility of cassiterite can be enhanced by increasing either acidity or alkalinity in hydrothermal solutions as a consequence of the duality of tin.The minimum solubility of cassiterite is found in neutral solutions.F-and CL-coordination compounds of Sn can alternate with hydroxyl coordination compounds with changing pH in the solutions.In this case,F^- and Cl^- and OH^- can be substituted with each other.The dissolution reaction of cassiterite is of reducing nature.High temperature and acidic reducing environment are favorable for the dissolution of cassiterite and the trans-port of Sn^2 compounds in fluids or solutions.High-temperature fluoride and chloride fluids can all dissolve,extract and enrich Sn to form F^- and /or Cl-coordination compounds,However,Fplays a more important role than Cl.F-coordination compounds are more stable and efficient than Cl-coordination compounds during the transport an enrichment of Sn in melts or solutions.The solubili-ty of cassiterite and the amount of Sn extracted from granitic melt depend not only on T,P,pH and Eh in the fluids or solutions,but also on the amounts of dissociated F^- and Cl^- in the fluids.     

Bauxite Deposits in China

Bauxite deposits in China,rangin in age from Late Paleozoic to Cenozoic ,are distributed mainly in Shanxi,Shandong Henan,Guizhou,Guangxi and Yunnan.Based on stratigraphic relations they can be clas-sified as 6 types:inter-system marine,inter-system continental,intra-system marine,intra-system continent-tal,weathering lateritic and weathering accumulation types.But in terms of depositional environments,only four types are distinguished,I.e.the marine deposits,continental deposits,lateritic deposits and weath-ering-accumulation deposits.These deposits have been formed in two steps:firstly,the depression of paraplatform or front basin margins in paleocontinents and secondly,the development of littoral-lagoons on the eroded surface of karstified carbonate bedrocks.The aluminum may have been derived from the carbonate rocks with which the ores are associated,or from adjacent aluminosilicate rocks.     

拉斑玄武质岩浆极端分异之实例—Loch Ba环状岩墙的岩石学与地球化学

苏格兰西北部马尔地区Loch Ba环状岩墙系由条带状流纹溶结凝灰岩组成。该流纹岩含有大量暗色隐晶质包体。根据流纹岩及其暗色包体的结构构造特征、斑晶矿物及组合、含量、化学成分特征和全岩的常量元素变化特征，认为Loch Ba岩墙之深部存在着一强烈分带的岩浆房，岩浆房上部为流纹质岩浆，其下为强烈分带区，由英安质至底部至少是镁铁质安山岩浆组成。岩浆的分异结晶作用、深部岩浆对来自上部岩浆的捕获晶的同化作用及蚀变作用是造成岩石主要元素一系列变化的原因。