2082砂岩型铀矿床中铀矿物的电子探针研究

2082矿床是新发现的可地浸砂岩型铀矿床。该类矿床矿石中铀矿物颗粒细小，多在微米级别，光学显微镜下很难鉴别，电子探针等微束分析手段是研究砂岩型铀矿床物质组分的最有效手段。     

浅析郎都铜矿地质特征及成因

郎都铜矿区位于云南香格里拉县,地域接壤四川甘孜地区,是中甸岛弧区在三江成矿带上最有前景的找矿靶区[1],为一中小型矽卡岩型矿床(体)。本文将从区域、矿区、矿体等地质特征介绍,并由此简单分析矿床(体)成因。     

四川达州农乐杂卤石矿床的矿床地质特征及成矿模式再探

产于四川盆地东北缘三叠系中下统的埋藏浅、保存较好的农乐杂卤石矿床的发现,是中国找寻钾盐沉积矿床的重大突破,一直以来,其矿床地质特征及成矿模式被地质学者深入讨论及研究。本文结合实际勘查资料及前人工作程度,从该矿床的岩系剖面特征、杂卤石矿石的矿物组合和结构构造等方面对其矿床地质特征及成矿模式进行探讨。     

甘肃省肃南县长干峡铜矿矿床地质特征及深边部与外围找矿潜力

长干峡铜矿是位于北祁连成矿带里塞浦路斯型铜矿床,由于属于老矿山,目前无新的矿体发现,铜矿资源已处于危机程度。为保持矿山的可持续发展,在矿山的深边部及外围开采铜矿资源的寻找是十分必要的。本文通过对长干峡矿区外围成矿地质分析、矿床地质特征及矿床成因进行研究的基础上,进而分析矿山的深边部及外围找矿潜力,提出找矿方向,为实现该地区铜矿找矿工作的重大研究提供科学依据。     

橄榄石矿床地质特征与成矿条件的研究及分析

橄榄石矿床地质特征与成矿条件,需要研究人员进行详细的勘察和记录,首先从橄榄石矿床特质特征入手,其主要内容有成矿的地质背景、矿床地质和矿石特征,然后阐述橄榄石宝石矿物性质及特征,最后论述成矿条件分析,分析表明碱性玄武岩的快速上升,是整个矿床形成的搬运条件。地幔岩浆的逐渐上涌,研究人员要确定地幔成因,然后快速带至地壳浅层,形成必要的搬运条件。     

玲珑地区金矿石中金矿物电子探针分析及对比

玲珑地区金矿位于胶东招掖金矿带东端与招平金矿带的交汇部位，该地区金产量和储量均居我国脉状金矿之首。查明矿石中金矿物成分的变化规律对于研究矿床成因、找矿预测和矿石的工艺加工具有重要的意义。矿床地质特征玲珑地区金矿的容矿围岩均为花岗岩，并以玲珑花岗岩为主...     

云南墨江金厂金矿床成矿特征和成矿作用

墨江金厂金矿床是哀牢山金成矿带的重要矿床之一,具有独特的地质成矿特征。目前多个学者对墨江金矿床进行了研究工作,此矿床的成因是众多学者讨论的焦点。文章基于野外地质调查情况,根据矿床地球化学分析,对云南墨江金厂金矿床中成矿流体演化过程进行讨论,对成矿阶段做出明确的划分,并确定成矿流体来源,旨在深入了解此矿床的成因及成矿规律,为判断墨江金矿的成矿过程、矿床成因以及成矿阶段划分提供依据。     

罗山金矿不同产状金矿物电子探针分析

本文在地质研究的基础上,详细研究了罗山金矿不同主成矿阶段、不同产状金矿物的成分特征。所获取的早阶段金矿物成色高于晚阶段,包裹金的成色高于裂隙金,同一金矿物组成成分在不同部位是有变化的。这些结论对确定该矿床的成因和指导找矿预测具有重要意义。矿床地质特征罗山金矿床位于胶东西北部著名的招掖金矿带的东端,属于玲珑金矿田的欧家界矿段。罗山金矿的金矿围岩为玲珑黑云母花岗岩,控矿构造以北东,北北东向断裂构造为主,矿体呈脉状、透镜状或不规则状产于矿脉内。矿石组成有石英、黄铁矿、黄铜矿、银金矿、自然金、自然银等。矿石构…     

新疆和田县卡孜勒北铅锌矿地质特征及找矿标志

卡孜勒北铅锌矿处于慕士塔挌-阿克赛钦(陆缘盆地)Fe-Cu-Au-Pb-Zn-RM-白云母-宝玉石矿带,成矿地质条件优越,文章通过对矿区地质特征、控矿因素、矿床成因、找矿标志的分析,简要总结了矿区地质、矿床、矿石特征和铅锌矿找矿标志,为卡孜勒一带进一步寻找铅锌矿提供参考。     

澳大利亚西澳洲Withnell矿床地质特征与控矿因素浅析

Withnell矿床位于Mallina剪切带内,成矿地质条件优越,已发现了三条具有规模的金矿带;矿床成因受地层、多期次构造叠加复合控制,属受脆-韧性剪切带控制的蚀变岩型金矿床。     

电子探针在冀东峪耳崖金矿载金矿物研究中的应用

利用电子探针对矿相显微镜下难以分辨的矿物颗粒进行了微区图像及成分分析。峪耳崖金矿中的载金矿物为黄铁矿、碲铋矿。碲铋矿为本次工作中重点研究的载金矿物。根据矿物组合及矿物形成温度把碲铋矿分为早晚两期。碲铋矿多呈他形粒状,从早期到晚期碲铋矿中Fe元素含量降低而Te、Bi、Ag元素含量升高。利用背散射电子像可清晰地看到碲铋矿中包裹银金矿。通过比较碲铋矿中金的含量与黄铁矿中金的含量,看出碲铋矿中金的含量略高于黄铁矿中金的含量,可将碲铋矿作为找矿标志之一。     

Adsorption and Direct Electron Transfer from Hemoglobin into a Three‐Dimensionally Ordered Macroporous Gold Film

Application of protein‐based, direct electron communication in bioelectronic devices, biosensors, or biofuel cells usually requires high stability and function density of the immobilized proteins or enzymes. Traditional methods have been used to increase the function density using multilayer immobilization techniques at the expense of losing stability and electron‐communication rate, that is, generally only protein molecules near the electrode surface are electroactive. In order to overcome the above problems, a three‐dimensional, ordered, macroporous gold film electrode is synthesized electrochemically by an inverted colloidal crystal template technique. The uniform, three‐dimensional macroporous gold provides superior conductivity, high stability, and large surface area. Its interconnected macroporous structure, containing gold nanoparticles, significantly enhances the amount of adsorbed hemoglobin (Hb) molecules at the monolayer level and also provides a good microenvironment for retaining the biological activity of the adsorbed protein, as confirmed by electrochemical and attenuated total reflection Fourier‐transform infrared spectroscopy. Therefore, direct electron transfer between the adsorbed Hb and the electrode is achieved. Adsorption of Hb on the macroporous gold film electrode is monitored using electrochemical impedance spectroscopy. The saturated adsorption amount, Γ, of the Hb is determined to be 6.55×10^–10 mol cm^–2 with a surface coverage of 88.1 %. The electrochemical behavior and the adsorption mechanism of Hb on the macroporous gold film electrode are discussed on the basis of the experimental results.     

电子探针在黑龙江省三矿沟铁铜矿床含金、银矿物研究中的应用

通过对三矿沟铁铜矿床野外产出的地质特征及矿脉间的穿插关系、矿物共生组合特征的观察,结合光学显微镜观察和电子探针分析,研究了三矿沟铁铜矿床的含金、银矿物.将矿床的成矿期次划分为矽卡岩期、石英-硫化物期和表生氧化期3个成矿期5个成矿阶段.从物理化学性质上的变化,探讨了含金、银矿物的特征.碲银矿的发现在前人研究资料中未见有报...     

Mechanisms Controlling Crystal Habits of Gold and Silver Colloids

Examples of gold and silver anisotropic colloids, such as prisms and rods, have appeared in the literature for many years. In most cases, the morphologies of these thermodynamically unfavorable particles have been explained by the particular reaction environment in which they were synthesized. The mechanisms used to explain the growth generally fall into two categories, one in which chemically adsorbed molecules regulate the growth of specific crystal faces kinetically, and the other where micelle‐forming surfactants physically direct the shape of the particle. This paper raises questions about the growth of anisotropic metal colloids that the current mechanisms cannot adequately address, specifically, the formation of multiple shapes in a single homogeneous reaction and the appearance of similar structures in very different synthesis schemes. These observations suggest that any growth mechanism should primarily take into consideration nucleation and kinetics, and not only thermodynamics or physical constrictions. The authors suggest an alternative mechanism where the presence and orientation of twin planes in these face‐centered cubic (fcc) metals direct the shape of the growing particles. This explanation follows that used for silver halide crystals, and has the advantage of explaining particle growth in many synthesis methods. In this mechanism, twin planes generate reentrant grooves, favorable sites for the attachment of adatoms. Shape and structural data are presented for gold and silver particles synthesized using several different techniques to support this new model. Triangular prisms are suggested to contain a single twin plane which directs that growth of the initial seed in two dimensions, but limits the final size of the prism. Hexagonal platelets are suggested to contain two parallel twin planes that allow the fast growing edges to regenerate one another, allowing large sizes and aspect ratios to form. Rods and wires were found to have a fivefold symmetry, which may only allow growth in one dimension. It is expected that a superior mechanistic understanding will permit shape‐selective synthesis schemes to be developed.     

Design of Catalytically Active Cylindrical and Macroporous Gold Microelectrodes

Porous gold structures with a well‐defined pore size and thickness are obtained through electrochemical deposition of gold in a colloidal crystal template synthesized by the Langmuir–Blodgett (LB) technique. Cylindrical gold wires were used as substrates for the LB deposition of successive monolayers of silica particles of various sizes, and the electrodeposition of gold through this inorganic template led to a homogeneous, porous metal structure. These materials were characterized through typical electrochemical experiments and showed high surface‐to‐volume ratios with promising features for their further use in miniaturized electrocatalytic devices.     

应用XRD和HRTEM研究红粘土中的磁性矿物 ——以阿尔金新近系彩虹沟组剖面上段红粘土为例

前人已利用岩石磁学法对阿尔金彩虹沟组剖面上段红粘土的磁化率进行了研究,但对其中磁性矿物的种类和物相组合研究仍不足,因此,本文在前人研究的基础上,利用粉末X射线衍射和高分辨透射电镜对该红粘土中的磁性矿物进行物相鉴定和微观结构研究.结果表明,该红粘土中的磁性矿物基本为赤铁矿,这与前人用间接岩石磁学方法研究得出的结论一致.高...     

Large Area Self‐Assembly of Nematic Liquid‐Crystal‐Functionalized Gold Nanorods

Fascinating nematic‐ and smectic‐like self‐assembled arrays are observed for gold nanorods partially capped with either laterally or terminally attached nematic liquid crystals upon slow evaporation of an organic solvent on TEM grids. These arrays can be manipulated and reoriented by applying an external magnetic field from quasi‐planar to vertical similar to a Fréedericksz transition of common organic nematic liquid crystals. Birefringence and thin film textures of these self‐assembled gold nanorod arrays observed by polarized optical microscopy are strongly reminiscent of common organic nematic liquid crystal textures between crossed polarizers and, additionally, support the formation of ordered liquid crystal‐like anisotropic superstructures. The ordering within these arrays is also confirmed in bulk samples using small angle X‐ray scattering (SAXS).     

Gold Nanoparticles Stabilized by Acetylene‐Functionalized Multidentate Thioether Ligands: Building Blocks for Nanoparticle Superstructures

Aiming at the formation of inorganic/organic hybrid gold nanoparticle superstructures, the design and synthesis of acetylene‐monofunctionalized multidentate thioether ligands and their ability to stabilize gold nanoparticles are presented. Rather monodisperse gold particles with diameters of about 1 nm are obtained, which are coated by a small number of ligands, each comprising a silyl‐protected acetylene. The acetylene is attached at the end of a rigid ethynylene‐phenylene unit of variable length, leading to functionalized gold nanoparticles carrying acetylenes at different distances from the nanoparticle surface. These particles are interlinked by diacetylene formation and are investigated by transmission electron microscopy and UV/vis spectroscopy, revealing the formation of nanoparticle aggregates and small superstructures such as dimers or trimers while the nanoparticles themselves retain their integrity. The interparticle distance in small nanoparticle superstructures reflects the ethynylene‐phenylene spacer length corroborating the wet chemical interlinking as the origin of these organic/inorganic hybrid structures.     

岩石矿物中氧化铁电子探针价态定量分析方法的研究

本文主要论述利用标准曲线法测定矿物中价态铁含量的电子探针定量分析方法。电子探针定量分析含氧化铁矿物时,氧化铁的成分只能以＂FeO＂形式给出全铁的含量,而不能准确地把＂Fe2O3＂和＂FeO＂各自的百分含量分开,这就给地质研究人员对于地质环境,矿物的成因,成岩作用及成岩后生作用等方面的研究带来很多困难。根据地质研究的需要,作者进行了此方法的研究及实验。利用天然菱铁矿和赤铁矿配制含有不同比例的FeO和Fe2 O3的标准样品。用电子探针测定这些标样中铁元素的Lα和Lβ的强度值,经过ZAF法修正,得到ILα/ILβ的强度比值,由Lα和Lβ线系的强度比和标样中价态铁的浓度比绘制成标准曲线。样品中铁元素的价态值,根据电子探针定量分析＂FeO＂数据及ILα/ILβ的比值,由此曲线求得FeO和Fe2O3的定量分析结果。     

一种用于扩散连接的金浆料

研制了一种用于扩散连接的金浆料。这种浆料主要由金粉和有机载体组成。浆料的烧成特性和粘度对扩散连接强度影响较大。金粉的分散性、表面形态和颗粒尺寸会影响浆料的烧成特性和粘度。载体会影响浆料的粘度。金浆料中掺入片状金颗粒能改善扩散连接强度