湖南省道县审章塘矿区钨多金属矿矿床地质特征及成矿规律

审章塘钨多金属矿床属典型矽卡岩型白钨矿床,矿床成矿规律为接触交代矽卡岩型钨铅锌多金属矿床。对审章塘矿区钨多金属矿矿床成矿地质背景、矿床地质特征、矿床成矿规律进行分析。     

索尔库都克铜钼矿区域地质特征研究

通过对索尔库都克铜钼矿床的矿床地质特征进行整理和总结,划分了详细的成矿期次和成矿阶段,为以后科研工作及矿区后续勘查工作提供更详实的资料和依据。野外地质调查和室内研究表明索尔库都克铜钼矿床发育早、晚两期矽卡岩并分别伴有成矿作用,其中早期矽卡岩主要呈层状、似层状产出,部分呈透镜状产出,成矿金属元素为Fe-Cu-Mo组合;晚期矽卡岩均呈脉状产出,穿切早期矽卡岩和围岩,成矿金属元素为Cu-Mo-Zn±Pb组合。本次研究显示,索尔库都克铜钼矿床是一个具有叠加成矿特点的矽卡岩型矿床。     

关于矽卡岩矿床资源储量的设计利用

知不拉铜矿位于特提斯-喜马拉雅成矿域的冈底斯成矿带,为石榴石矽卡岩矿床.通过分析该矿床成矿地质背景、矿床地质特征和矿床成因,在开采中对资源储量利用的合理设计,给出在矿山设计中对矽卡岩矿床的资源储量利用的一般思路,进而指导矽卡岩矿床的矿山设计及生产工作.     

辽宁省接触交代(矽卡岩)型铜、钼矿床成矿地质特征

通过对辽宁省内成矿环境不同的铜钼两个典型矿床的成矿作用、矿床地质特征的分析,提出了接触交代(矽卡岩)型矿床的成矿机制、矿体形态、矿物共生组合、围岩蚀变等方面的矿化特征,部分揭示了接触交代(矽卡岩)型矿床的成矿模式。     

沂南金矿矽卡岩型多金属矿床成矿规律及深部找矿预测

通过金龙矿床的成矿规律特征分析,从铜井岩体的地质特点、岩浆及矿液活动中心、含矿层与矽卡岩、矿体的空间分布等方面对矿床进行成矿规律总结,同时运用此规律对矿床深部及边缘进行成矿规律研究和找矿预测。     

广东金石嶂银多金属矿床稀土元素地球化学特征及意义

基于对矿床内不同岩(矿)石的稀土元素地球化学特征的初步分析,结果表明:不同岩(矿)石特征表现相似,研究区多金属矿与安山玢岩、矽卡岩的稀土元素总量接近,表明矿体的形成与安山玢岩、矽卡岩关系密切;研究区多金属矿体的稀土元素配分模式、轻重稀土富集程度及Eu异常特征与安山玢岩、矽卡岩更为相似,也反映了区内多金属矿与二者关系密切;研究区安山玢岩、矽卡岩很可能为多金属矿的主要物质来源。由于安山玢岩、矽卡岩的形成提供了热源及主要成矿元素,使得成矿元素富集,最终形成银多金属矿。结合成矿地质特征认为,在今后地质找矿过程中,应更加注重安山玢岩、矽卡岩与断裂接触地段。     

水口山矿田成矿研究与找矿方向探讨

在前人研究和地质找矿基础上,对水口山矿田地质成矿成因、特点、类型讨论,对影响找矿布置的问题进行剖析,综合水口山矿田内各矿床地质特征,研究矿床矿石成分、结构构造、围岩蚀变、矿体产状、围岩岩性等特点,认为水口山矿田是岩浆期后热液作用形成的浅成中-低温热液矿床。老鸦巢、鸭公塘矿床,产状近直立的铅锌矿体和含金黄铁矿矿体位于浅成低温热液的中心,康家湾铅锌金银矿是一个远离成矿母岩的矿床。岩浆侵入活动和潜火山作用对成矿有着重要作用。第二找矿空间内开展矽卡岩型矿床的勘查是水口山矿田下一步深部找矿方向。     

云南南秧田钨矿矿床地质特征及成矿控制因素浅析

南秧田钨矿床位于云南省文山州麻栗坡县南南西方向,地质构造单元为华南褶皱系西南角,滇东南拗陷褶皱带老君山锡钨成矿区西南侧。受区内地层、岩性、区域变质作用及热液迭加形成了较典型“层控矽卡岩”型矿床,通过对矿床地质特征的分析,进一步总结该区成矿控制因素,认为具有较好的找矿前景。     

青海香日德哈拉森金铁多金属矿床地质特征及成因分析

通过分析香日德哈拉森金铁多金属矿床地质特征、成矿地质背景和矿床地质特征,认为该矿床是矽卡岩型铁矿床,并建立了区域找矿标志,指出找矿方向。     

汝城钨矿矿床地质特征及边深部找矿预测

在总结汝城钨矿成矿地质背景及矿床地质特征的基础上,对矿区成矿规律进行了总结,认为汝城钨矿边深部成矿地质条件优越,具有良好的矽卡岩型白钨矿、石英脉型黑钨矿和蚀变花岗岩型钨矿找矿前景,并由此圈定了3处边深部找矿预测区。     

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。     

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.     

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.     

原子荧光光谱法测定土壤中的铅、铬、镉、汞、砷、锌、铜、镍等元素研究

土壤无机污染物铅、铬、镉、汞、砷、锌、铜、镍这八大重金属,是一般土壤检测中的必检项目。金属元素在土壤中积累富集后,有可能通过雨水迁移,造成地下水,地表水污染,或者通过农作物进入食物链,进而影响食品安全和人体健康,因此,对这些元素的检测显得尤为重要。本文采用原子荧光光谱法对土壤中的金属元素进行测量,同时结合微波消解技术对样品进行处理,确保测量数据的准确性。     

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.