湖南安化芙蓉金矿矿床地质、地球化学特征及成因

安化芙蓉金矿是一个极具找矿前景的破碎蚀变型金矿, 是近年来湖南金矿地质找矿勘查的重大突破。它的发现打破了湖南金矿规模偏小的格局, 影响和改变了湖南金矿地质勘查的思路和观念, 为在湖南寻找大规模新类型金矿提供了范例。通过对芙蓉金矿矿床地质特征、成矿地质条件的阐述, 分析和研究了矿床地质、地球化学特征, 总结了矿床富集规律, 探讨了矿床成因。     

湖南安化芙蓉金矿矿床地质、地球化学特征及成因

安化芙蓉金矿是一个极具找矿前景的破碎蚀变型金矿,是近年来湖南金矿地质找矿勘查的重大突破。它的发现打破了湖南金矿规模偏小的格局,影响和改变了湖南金矿地质勘查的思路和观念,为在湖南寻找大规模新类型金矿提供了范例。通过对芙蓉金矿矿床地质特征、成矿地质条件的阐述,分析和研究了矿床地质、地球化学特征,总结了矿床富集规律,探讨了矿床成因。     

湖南安化芙蓉金矿矿床地质、地球化学特征及成因

安化芙蓉金矿是一个极具找矿前景的破碎蚀变型金矿 ,是近年来湖南金矿地质找矿勘查的重大突破。它的发现打破了湖南金矿规模偏小的格局 ,影响和改变了湖南金矿地质勘查的思路和观念 ,为在湖南寻找大规模新类型金矿提供了范例。通过对芙蓉金矿矿床地质特征、成矿地质条件的阐述 ,分析和研究了矿床地质、地球化学特征 ,总结了矿床富集规律 ,探讨了矿床成因。     

湖南金矿床类型、特点及前景预测

根据湖南金矿资源的分布特征、矿床成矿地质条件、围岩蚀变、矿物共生组合关系,从矿山地质角度出发,以矿床找矿标志的赋矿岩石和成矿作用为依据,将湖南省金矿进行了分类,结合资源勘查利用现状,对金矿资源前景进行预测,并提出发展对策。     

湖南金矿床类型、特点及前景预测

根据湖南金矿资源的分布特征、矿床成矿地质条件、围岩蚀变、矿物共生组合关系,从矿山地质角度出发,以矿床找矿标志的赋矿岩石和成矿作用为依据,将湖南省金矿进行了分类,结合资源勘查利用现状,对金矿资源前景进行预测,并提出发展对策。     

湖南金矿床类型、特点及前景预测

根据湖南金矿资源的分布特征、矿床成矿地质条件、围岩蚀变、矿物共生组合关系 ,从矿山地质角度出发 ,以矿床找矿标志的赋矿岩石和成矿作用为依据 ,将湖南省金矿进行了分类 ,结合资源勘查利用现状 ,对金矿资源前景进行预测 ,并提出发展对策。     

湖南金矿床类型、特点及前景预测

根据湖南金矿资源的分布特征、矿床成矿地质条件、围岩蚀变、矿物共生组合关系, 从矿山地质角度出发, 以矿床找矿标志的赋矿岩石和成矿作用为依据, 将湖南省金矿进行了分类, 结合资源勘查利用现状, 对金矿资源前景进行预测, 并提出发展对策。     

桃花金矿床介板冲—尖峰岭矿段破碎带蚀变岩型金矿体地质特征及找矿前景

阐述了桃花金矿床介板冲—尖峰岭矿段②号矿体低品位氧化矿的地质找矿成果,并通过分析矿床地质特征,总结找矿标志,对破碎带蚀变岩型金矿体的找矿前景提出了明确的见解,为寻找破碎带蚀变岩型金矿体的找矿勘查工作提供了宝贵的经验.     

金矿成矿地质特征及找矿方向探讨

黄金的资源储量和储量规模代表一个国家的经济实力和国际地位,世界各国历来都非常重视黄金资源的勘查与开发。国内有众多金矿,地质特征各不相同,湖南铲子坪金矿是比较典型的金矿。本文以湖南铲子坪金矿为研究对象,探讨金矿成矿机理,分析成矿地质背景、矿床地质特征、矿床地球化学特征。结合成矿规律与成矿预测的知识,总结找矿标志,指明找矿方向。     

柴达木北缘二旦沟金铜矿成矿特征及找矿标志

二旦沟金铜矿位于赛什腾山—阿尔茨托山加里东期、印支期铅、锌、金、钨锡(铜、钴、稀土)成矿带上,成矿地质条件优越。受自然条件制约,二旦沟金矿床发现较晚,且工作程度较低,找矿方向不明确。通过对成矿地质背景、矿床地质特征等资料综合研究,认为金铜矿与华力西期蚀变花岗闪长斑岩、石英脉及北西—南东向构造作用密切,成矿类型为构造蚀变岩型金矿、石英脉型金矿。通过对矿床地质特征和成矿作用的总结,对矿区找矿前景和找矿方向进行了探讨,以期对矿区矿产勘查工作有所裨益。     

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.     

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.     

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。