胶东地区玲珑金矿和焦家金矿成矿控矿构造对比研究

玲珑金矿和焦家金矿是胶东地区大型金矿田,玲珑金矿田以石英脉型金矿床为主,焦家金矿田以蚀变岩型金矿床为主。在简要概述区域构造背景基础上,分别对2个大型矿床的成矿构造进行了分析,着重探讨了郭家店幔枝构造对2类矿床的成矿控矿作用,郭家店幔枝构造外围拆离带发育的一系列韧-脆性剪切带控制着矿床的分布,而矿化类型受断裂性质及位置的控制。依据幔枝构造理论,胶东地区金矿成矿物质来源于深部,依据该理论,研究了玲珑和焦家矿区的矿体分布、延伸及蚀变特征,进行成矿作用分析并推测深部找矿方向。     

沈家沟金矿床成矿特征与找矿前景

强片理化带是沈家沟矿床的基本控矿条件 ,但因成矿断裂的活动牲质不同而形成了两种成矿特征的差异。在初步探讨矿床成因、成矿规律的同时 ,对两类成矿特征做了分析对比 ,后期逆冲断裂与先期强片理化带叠加于同一空间者 ,其矿化更佳。据此认识 ,指出了在矿区外围及邻区寻找同类金矿的找矿标志与前景     

江西彭泽兆吉沟矿区金矿成矿特征与找矿方向

区域大地构造上处扬子台坳、淮阳台隆和九岭-鄣公山台隆之间的赣北地区为金矿等多金属矿的成矿作用提供了得天独厚的区域构造条件,是我国重要的金矿成矿区。本文分析了彭泽兆吉沟矿区的成矿地质条件、控矿因素、矿化带特征等金矿成矿特征,为该地区后续金矿找矿提供了数据支撑。     

吉林夹皮沟金矿本区矿床成矿及找矿远景评价

吉林夹皮沟成矿带金矿成矿作用与太古宙变质岩系、幔源岩浆活动、韧性剪切作用密切相关,成矿流体以地幔流体为主,成矿物质主要来源于地幔。地幔活动形成的韧性剪切带及其伴生的次一级断裂构造不仅是成矿流体的运移通道,而且是矿体就位的有利空间。本文论述了夹皮沟主要成矿带成为北西大型韧性剪切带及其伴生的次一级构造带北东构造带（即本区矿床）的基本地质条件-太古宙变质岩系广泛分布,岩浆岩脉、韧性一脆性构造活动强烈;金矿化体（石英脉）受韧性剪切带两侧的次一级断裂控制,围岩蚀变是绢英岩化、硅化、绿泥石化、黄铁矿化等。找矿研究表明,本区矿床深部同样具有较大的成矿潜力,因此,夹皮沟本区矿床成矿带深部应具有良好的成矿远景（第二成矿梯段）。     

南秦岭金龙山金矿构造控矿作用及成矿模式研究

运用基础地质调查和化探方法,对金龙山金矿区成矿带构造、矿区构造、矿脉、矿体及矿石矿物特征进行研究,得出金龙山成矿带脉赋存规律为NE或NW向断裂构造角砾岩型矿化体与近EW向层间剪切带型矿化体交会,主矿脉呈NE向展布,矿脉延深大于延长,控矿构造以主断裂控矿为主、次级断裂控矿为辅。建立了NE向主构造控矿模式：左行走滑构造带在剖面上呈负花状构造,金矿脉及其上部的汞锑矿脉发育在断裂带中,形成断裂构造角砾岩型矿化体,控矿断裂旁侧层间剪切带中形成层间剪切带型金矿化体。锡铜沟—金龙山成矿带分布着4个应变中心,目前仅东坪—两河应变中心未发现任何矿床（仅有铅锌矿点）,所以该应变中心将是下一步找矿的远景区。北侧的镇安—龙王沟和锡铜沟—铁厂构造变形带中同时存在强变形带及弱变形域,这2条变形带也是重点成矿区域,可作为成矿远景区。     

坦桑尼亚尼亚卡贝尔金矿床成矿地质特征及找矿前景分析

通过对坦桑尼亚尼亚卡贝尔金矿区的成矿地质背景及矿体的主要地质特征的分析,大致了解了矿区金矿化体的主要地质特征和成矿因素。尼亚卡贝尔金矿区金矿化受北西向的韧性剪切带的控制,呈脉状或透镜状产于闪长岩体内,条带状含铁建造带的矿化程度低且仅局部矿化。矿石类型主要为蚀变岩型,黄铁矿化普遍发育,局部见硅化。矿石矿物为自然金。根据矿区的控矿构造、赋矿岩层、矿化蚀变强度等主要成矿地质特征分析,尼亚卡贝尔金矿区金矿化的程度较低,找矿前景一般。     

大渡河地区三碉金矿床地质特征及成因

三碉金矿床是产于大渡河韧性剪切断裂带内典型的金矿床,矿体均赋存于混合花岗岩外接触带的斜长角闪岩和混合岩化斜长角闪岩中,矿区F1、F2两条韧-脆性剪切断裂破碎带,控制了矿床空间定位和Ⅰ号、Ⅱ号、Ⅲ号金矿带。矿区金矿体产于Ⅰ号、Ⅱ号金矿带石英脉中,金矿床成矿作用为热液充填和交代作用为主,成矿时代位于喜马拉雅构造期,成矿温度为200℃~300℃。本次工作根据近年来矿山详查成果,结合前人经验理论,总结分析了该金矿床矿区地质特征、矿床地质特征,并通过研究矿床成矿作用、成矿理化条件、成矿物质来源、成矿时代探讨了矿床成因,以供进一步工作参考。     

关于雪峰山一带金成矿区的成矿时代

雪峰金成矿区的矿床(点)均赋存在前寒武纪地层中,但武陵-雪峰期成矿作用并不重要,火山沉积-变质热液成矿模式并不能很好地解释本区金矿床的形成.根据铅同位素资料分析和矿床构造地质研究,认为本区金的成矿时代与华南地区铀的成矿时代一样,主要为中新生代,金矿化可能主要与中新生代地壳拉张伸展作用所致的热水改造富集作用有关.     

内蒙古桦树沟金矿区成矿地质特征及找矿方向

桦树沟金矿区处于华北地台北缘内蒙地轴中段南缘,太古宙集宁岩群构成区内褶皱变质基底,金矿化受NW、NE向断裂破碎带控制。在面积近15 km2的矿区范围内发现了木匠沟和桦树沟等6个金矿化点,金矿化主体为构造蚀变岩型,其次为石英脉型。根据本区金矿的赋矿地质条件和物化探异常特征,重点分析了桦树沟金矿区的成矿地质特征及控矿因素,并从构造和岩浆活动等方面论述了金矿的成矿地质条件与矿床成因,提出了近NW和NE向构造是本区的重点找矿地带,尤其要注意伴随断裂活动侵入的石英脉和石英斑岩脉,指出了金矿的找矿方向。     

甘肃白银地区金矿成矿规律及找矿方向

白银地区晚元古代以来形成的大地构造环境奠定了金矿床产出的大地构造背景。金矿成矿作用受一定的的地层、构造和岩浆岩控制,不同级别和规模的构造分别控制着金矿成矿带、矿床（体）的产出、矿床类型及成矿元素组合。进一步找矿方向应为深大断裂两侧及韧（脆）性剪切带。     

铂饰品中Pt, Pd, Au, Ag, Cu, Ni, Zn, Fe的测定

试验研究建立了同一试料溶液连续、同时测定铂饰品中各成分的分析方法。主体Pt以氯铂酸铵称量法及火焰原子吸收光谱(FAAS)法或电感耦合等离子发射光谱(ICP-AES)法测定滤液中残留Pt进行补差而测定。主成分Pd,Au,Ag,Cu和焊料成分Ni,Zn,Fe以FAAS法或ICP-AES法测定。其方法回收率分别为:Pt99.9%~100%;Pd99.3%~99.7%;Au99.5%~l01.5%;Ag98.0%~100%;Cu97.7%~99.3%;Zn98.0%~99.0%;Ni94.0%~105%;Fe95.0%~99.0%。实际试样分析时,各成分质量分数之和一般在99.12%~l01.2%之间,接近于100%,间接说明方法的可靠性。本法适用于Pt-Pd二元体系和Pt-Pd-Au-Cu多元复杂体系的铂饰品的破坏分析,可用于校正X荧光光谱法无损检测铂饰品的分析结果。     

稀土金属中14种非稀土杂质的ICP-MS法同时测定

本文研究了用 ICP- MS仪器同时测定稀土金属中 Mg、Al、Ti、Cr、Mo、Mn、Co、Ni、Cu、Zn、Pb、W、Nb、Ta等 14种非稀土杂质。研究了各稀土基体对被分析元素的基体效应 ,选择了相匹配的内标元素。比较了标准曲线法与标准加入法的测定结果。确定了用内标元素校正基体效应及仪器漂移 ,以标准曲线法直接测定。进行了加料回收和精密度实验 ,回收率在 94%～ 113%之间 ,RSD<10 %。被分析元素的检出限为 0 .0 1～ 0 .2 0 ng/ m L,测定下限为1～ 2 0 μg/ g。     

Increased-contrast, high-spatial-resolution, diffusion-weighted, spin-echo, echo-planar imaging

An insertable head gradient coil with a maximum gradient amplitude of 45 mT/m and a rise time of 150 musec along all three major axes was used to collect high-spatial-resolution, single-shot, spin-echo, echo-planar, diffusion-weighted magnetic resonance images with b values ranging from 0 to 2,200 sec/mm2. Improvements in spatial resolution allowed better visualization of large white matter tracts and their relation to adjacent anatomic structures. Excellent contrast and anatomic detail were revealed for most structures in the brain when a sufficient number of acquisitions were collected.     

ICP-AES法测定铍铜合金中Be, Ni, Ti, Co, Fe, Al, Si, Mg和Pb

通过操作条件的试验研究，用基体匹配法校正基体干扰，并选择了最佳工作条件。样品加标回收率为96％～110％，方法快速、简便、可靠，适用于铍铜合金的快速检验。     

Susceptibilities of non-Pseudomonas aeruginosa gram-negative nonfermentative rods to ciprofloxacin, ofloxacin, levofloxacin, D-ofloxacin, sparfloxacin, ceftazidime, piperacillin, piperacillin-tazobactam, trimethoprim-sulfamethoxazole, and imipenem

Agar dilution MICs of 10 agents against 410 non-Pseudomonas aeruginosa gram-negative nonfermentative rods were determined. MICs at which 50 and 90% of the isolates were inhibited, respectively, were as follows (in micrograms per milliliter): sparfloxacin, 0.5 and 8.0; levofloxacin, 1.0 and 8.0; ciprofloxacin, 2.0 and 32.0; ofloxacin, 2.0 and 32.0; D-ofloxacin, 32.0 and > 64.0; ceftazidime, 8.0 and 64.0; piperacillin with or without tazobactam, 16.0 and > 64.0; trimethoprim-sulfamethoxazole, 0.5 and > 64.0; imipenem, 2.0 and > 64.0. With the exception of those for Stenotrophomonas maltophilia, Burkholderia cepacia, and Alcaligenes faecalis-A. odorans, agar dilution MICs for all strains tested were within 1 dilution of inhibitory (bacteriostatic) levels as determined by time-kill methodology.     

Regional mapping panels for chromosomes 3, 4, 5, 11, 15, 17, 18, and X

The erm family of 23S rRNA adenine-N6-methyltransferases confers resistance to all macrolide-lincosamide-streptograminB (MLS) antibiotics, but not all MLS antibiotics induce synthesis of Erm methyltransferase with equal efficiency in a given organism. The induction efficiency of a test panel of MLS antibiotics was studied by using two translational attenuator-lac reporter gene fusion constructs, one based on ermSV from Streptomyces viridochromogenes NRRL 2860 and the other based on ermC from Staphylococcus aureus RN2442. Four types of responses which were correlated with the macrolide ring size were seen, as follows: group 1, both ermSV and ermC were induced by the 14-membered-ring macrolides erythromycin, lankamycin, and matromycin, as well as by the lincosamide celesticetin; group 2, neither ermSV nor ermC was induced by the 12-membered-ring macrolide methymycin or by the lincosamide lincomycin or the streptogramin type B antibiotic ostreogrycin B; group 3, ermSV was selectively induced over ermC by the 16-membered-ring macrolides carbomycin, chalcomycin, cirramycin, kitasamycin, maridomycin, and tylosin; and group 4, ermC was selectively induced over ermSV by the 14-membered-ring macrolide megalomicin. These data suggest that the leader peptide determines the specificity of induction by different classes of MLS antibiotics and that for a given attenuator, a major factor which determines whether a given macrolide induces resistance is its size.