内蒙古自治区科尔沁右翼中旗扎木钦铅锌矿成因与找矿方向探讨

本文详细叙述了扎木钦铅锌矿区域成矿地质背景、矿床特征、矿体特征、矿化阶段、围岩蚀变等地质特征,对控矿因素、成矿机理进行了分析、研究,初步认为矿床成因系由火山喷发时火山热液携带了成矿物质,在凝灰岩与凝灰质角砾岩中形成了矿体。为具有层控特点与火山热液有关的同成火山岩型矿床。     

辽宁义县红石金矿控矿因素及成因浅析

义县红石金矿赋存于中生界侏罗系义县组次火山岩中，是辽宁省首次发现的典型火山岩型金矿床。矿区内有3条金矿体，走向近南北。矿床的形成经历了四个成矿阶段。矿石类型主要为硫化物角砾岩和流纹斑岩、蚀变岩型。矿床受NEE、NNw向两组断裂控制，构造、次火山岩的侵入及热液活动直接参与了成矿作用。矿石中S、Pb、H、O同位素及成矿温度表明，金矿成矿物质来源于地幔和地壳深部，成矿热液主要由大气降水组成，混合部分岩浆水，成矿温度110℃～245℃，属火山岩型超浅成中低温岩浆热液型金矿床。     

金矿成矿规律、主要矿床类型及成矿地质特征

如果能够结合金矿床形成的原理找到它的形成规律,根据该形成规律分析它的矿床类型和每种矿床类型的主要地质特征,人们就能比较准确的找到金矿床,然后从中开采到人们需要的金金属。相关的地质工作者若要寻找金矿,就要仔细的研究金矿成矿规律、主要矿床类型及成矿地质特征这几个方面的问题。     

化念铁矿特征及成因浅析

本文较为系统地从化念铁矿矿体形态、矿石成分、结构构造、与围岩关系及区域地质、矿区地质、同位素年龄等方面,论述了矿床的成矿物质来源、成矿环境、控矿因素,认为矿床的成因类型为沉积改造型铁矿床或沉积变质型矿床。     

朝阳县长在营子乡后西地金矿的找矿前景

结合浅成低温热液型金矿床的成因,从大地构造背景、分布、成矿机理、形成时代、与碱性岩和斑岩型矿床联系几个方面,系统研究辽宁省朝阳县长在营子乡后西地金矿床的矿体特征,探讨该工作区金矿床的找矿前景。     

胶东夏甸金矿床矿化富集规律及深部盲矿体定位预测

夏甸金矿床是胶东招平断裂带中部典型的大型破碎带蚀变岩型金矿床。论文以系统详实的野外地质观测成果和矿床探采资料为基础,通过对夏甸金矿床的成矿地质背景、地质特征、赋矿地质体和控矿断裂带构造的系统研究,研究了其深部成矿及矿体定位规律,进行深部隐伏矿体成矿预测,为矿山进一步深部探矿提供科学依据。     

辽宁省盖州新宁金矿床地质特征及找矿标志

新宁金矿位于猫岭—卧龙泉金矿床集中区，北西向和北东向次级断裂为主要控矿构造。辽河群盖县组含炭质、泥质陆源碎屑沉积建造是金矿成矿的矿源层。中生代岩浆活动为矿床形成提供热源和成矿物质，促使成矿元素活化、迁移、定位，形成新宁金矿床。     

浅成低温热液型金矿床研究最新进展

浅成低温热液型作为一种新型的金矿类型,近年来得到了人们的广泛研究。在近年来的研究中,发现浅成低温热液型金矿床和碱性岩、斑岩型矿床之间存在着较为密切的联系,已经得到了越来越多的矿床学家的关注,并且希望对机理的研究有进一步的深入。本文主要介绍了浅成低温热液型金矿床的分类、成矿机理以及与斑岩型、碱性岩矿床之间的关系。     

北衙斑岩型金矿床快速定位预测——影像线环结构-构造地球化学集成成矿预测方法

北衙碱性斑岩型金矿床为“三江”地区金沙江-哀牢山喜山期富碱斑岩带中的金多金属矿床。碱性斑岩、复式穹隆构造与金矿床呈现构造-岩浆-矿化三位一体,金矿化集中于成矿晚期热液活动阶段。矿床遥感地质方法与构造地球化学方法获取了丰富的成岩成矿影像———构造地球化学(地质信息组成的矿床定位预测网络结构“隐信息”。据此构建了影像线环结构-构造地球化学集成成矿预测方法。     

地质地球化学特征及找矿靶区选择——广西乐业想里金矿普查区

本区属右江金矿成矿区,在大地构造上位于扬子陆块与华南褶皱系结合部位,具有良好的成矿地质条件.研究区地处桂西北典型的微细粒浸染型金矿床产出的有利地质背景区,是找微细浸染型矿床的有利地区之一.本文通过对该普查区地质特征与地球化学特征的研究,把二者结合起来,提出找矿靶区.     

南澜沧江火山岩带铜成矿地质背景及找矿前景

南澜沧江火山岩成矿带位于特提斯亚构造域(东段)之澜沧江晚古生代-三叠纪火山岩浆弧带。成矿带构造复杂,岩浆活动频繁,矿产资源丰富,矿种和类型多,具有良好的成矿地质条件。成矿带内铜矿类型有火山岩及火山沉积型铜矿床;与酸性侵入岩有关的热液脉状型、矽卡岩型和斑岩型铜矿床,以及复合成因的脉状铜矿床。介绍了区带内相继发现的一批以海相火山岩型(大平掌、三达山等)、热(卤)水沉积-改造型和斑岩-火山岩型(民乐铜矿)为主的大、中型铜矿床;展望了澜沧江火山岩成矿带具有寻找火山岩型铜矿的良好前景。     

北衙金多金属矿床地质特征与成因

详细讨论了北衙矿区的地质特征,通过对勘探资料的深入研究和野外观察,初步确定,北衙矿区存在两期岩浆活动,早期的石英正长斑岩、正长斑岩等近南北向分布,晚期的黑云正长斑岩、煌斑岩脉等呈近东西向展布。矿化主要与近南北向岩体关系密切。北衙地区存在五种矿床类型,即矽卡岩型铁金矿床,其形成时代相对较早,分布于万硐山矿段、马头湾矿段等地;斑岩-隐爆角砾岩筒型金铜矿床,分布于北衙矿区的西矿带的万硐山-红泥塘(观音箐一带,形成时代相对较晚,并叠加于早期的矽卡岩型矿床之上;裂隙-溶洞型铁金矿床,主要分布于北衙矿区的东矿带的笔架山一带,属强氧化高品位金矿石;砂岩型铁金矿床,分布于本区的三叠系下统腊美组(T1l)砂岩中,呈似层状产出,成矿潜力巨大;红土型金矿床,主要分布于北衙盆地浅表部位的丽江组(E2l)和第四系堆积物中,易采易选,可供利用。北衙地区下一步勘探和研究的主要矿床类型应是深部具有潜力的斑岩(隐爆角砾岩筒型金铜矿床和三叠系下统碎屑岩中产出的砂岩型铁金矿床。     

新疆若羌县石门铜金矿地球化学障及找矿方向

石门铜金矿位于塔里木板块北山裂谷西段,区域上分布有多处浅成低温热液型金矿床。石门铜金矿自2002年发现至今的近十年内,仅于普查阶段发现一条含铜金蚀变带之后一直没有突破。笔者结合石门铜金矿地质特征,围岩蚀变,矿体特征,对石门铜金矿中的成因矿物学进行了研究,分析矿体赋存部位的地球化学条件,明确了区内有利于金元素沉淀富集的地球化学障的位置,并提出找矿方向及工程布设建议,以期取得找矿突破。     

驼路沟钴金矿床地质特征与成因初探

驼路沟钴、金矿位于东昆仑褶皱系昆南断褶带内,产于晚古生代二叠系下统石英片岩中。矿床在区域变质作用的基础上,构造活动继续,现有的裂隙再次开启,后期中低温热液沿着构造薄弱带进一步将钴、金元素活化富集成矿。     

Selective ultrathin gold deposition by organometallic chemical vapor deposition onto organic self-assembled monolayers (SAMs)

We demonstrate a selective deposition of ultrathin gold layers via OMCVD (organometallic chemical vapor deposition) onto self-assembled dithiols. Dithiols have been self-assembled to produce a thiolated surface. The gold layer deposited from a gold precursor, present in the vapor around the sample, is bound to the exposed thiol groups. We demonstrate that it is possible to deposit gold only onto the areas where the binding thiol groups are located, and investigate the growth process with spontaneous desorption time-of-flight mass spectrometry, Rutherford backscattering spectroscopy, atomic absorption spectroscopy and atomic force microscopy.     

Initial epitaxial growth of (111) Au/(111) Cu and (111) Cu/(111) Au

The room temperature modes of growth of Au/(111) Cu and Cu/(111) Au are described. For the former growth mode initial deposits (2.4 Å) of gold on copper form smooth flat islands delineated by coincidence lattice misfit dislocations. For 6.0 Å of gold deposit, both thick and thin gold areas were observed with almost complete substrate coverage. For a 10 Å deposit, surface coverage was complete. Strain measurements and dislocation densities obtained on the (111) Au/(111) Cu films suggest the presence of two separate misfit dislocation networks at the interface. The coincidence lattice networks were large enough for transmission electron microscopy observation but contributed little to total overlayer strain. The (van der Merwe) natural lattice misfit dislocations were too closely spaced for direct observation but their presence was inferred because of the strain measurements. The initial epitaxy of Cu/(111) Au was similar to the Stranski-Krastanov model: the initial monolayer of copper (also delineated by coincidence misfit dislocations) grew smoothly on the gold; additional copper formed essentially stress-free “nuclei” on top of the initial copper layer.     

Stimulated crystallization of polycrystalline ZnTe films

Ultrathin (about 1.5 nm) initial deposits of chromium, aluminium, copper, gold and silver on carbon film substrates were used for the subsequent deposition of ZnTe films. Transmission electron microscopy studies revealed that a silver deposit acts as the best stimulator for the grain growth ZnTe films. It is observed that an increase in the thickness of the initial deposit of silver helped in increasing substantially the grain size of ZnTe. It is also observed that the electrical properties of the ZnTe films are improved with an increase in the thickness of the initial deposit of silver (below 2.5 nm).     

Nanoscale patterning of gold nanoparticles using an atomic force microscope

We report on the use of the tip of an atomic force microscope to remove selectively, and subsequently to deposit, nanoparticles of gold passivated with tri-n-octylphosphine oxide (TOPO)/octadecylamine. The study has revealed a minimum feature size of 50 nm in the removal experiment, while lines of 180 nm could be drawn with the gold nanoparticles, limited by the quality of the substrate surface.     

A cathodoluminescence study of the influence of the seed particle preparation method on the optical properties of GaAs nanowires

Cathodoluminescence at 8?K is used to compare the optical properties of AlGaAs-capped GaAs nanowires, grown by metal-organic vapour phase epitaxy and seeded by gold particles prepared by different methods. Six different methods were used to fabricate and deposit gold seed particles onto GaAs substrates: colloid particles, aerosol particles and particles defined by electron beam lithography. The nanowires were grown with and without an in?situ annealing step prior to the nanowire growth. The morphology showed no significant differences between the nanowires. The emissions from ensembles of nanowires have the same peak position, irrespective of seed particle type. Without the in?situ annealing step prior to the nanowire growth, there are significant differences in the emission intensity and emission patterns from nanowires grown from different seed particles. When an in?situ annealing step is included, all the resulting nanowires show identical optical emission intensity and emission patterns. This shows the importance of using an in?situ annealing step prior to growth. This study demonstrates that different preparation methods for gold seed particles can be used to produce GaAs nanowires with highly similar optical properties. The choice of particle preparation method to be used can therefore be based on availability and cost.     

Dislocations interfaciales et cohérence dans le système épitaxique fer-or

Iron was deposited in ultrahigh vacuum onto thin single-crystal films of gold oriented with (111) parallel to the surface plane. Study by electron diffraction and electron microscopy has shown that the initial growth of iron occurs by successive monolayers. Three stages in the deposit growth have been found: first the deposited film of iron is strained to match the gold substrate exactly; then interfacial dislocations appear at the gold-iron interface; and finally iron nuclei of b.c.c. structure are formed. The interfacial dislocations are in mixed orientation with their Burgers vectors $\text{1}\text{2}$a 〈110〉 inclined to the gold-iron interface; it is found that they have a poor efficiency for accommodating the misfit between the substrate and the deposit, so that for deposits of average thickness greater than 8 Å the interface is mostly incoherent.