葫芦岛水泉金矿床地质特征及成因探讨

辽宁省葫芦岛市水泉金矿地处辽西虹螺山一五指山多金属成矿带上,为典型的构造角砾蚀变岩型金矿床。本文着重概述了水泉金矿床地质特征及成因,论述了金成矿地质作用,提出了在葫芦岛市水泉地区寻找该类型金矿的找矿标志。     

内蒙古宁城县彭家杖子金矿矿床地质特征及成因分析

彭家杖子金矿位于喀喇沁断隆,矿区出露地层主要为太古界鞍山群长青组、热水组,岩性主要为灰白色—灰色一灰绿色斜长角闪片麻岩、黑云斜长片麻岩、角闪片麻岩、黑云角闪片麻岩、斜长角闪片岩。矿床受地层、岩性及构造破碎带的控制,其中金矿（化）体受北西向、近南北向和北东东向构造蚀变带控制,围岩为太古界鞍山群变质岩,矿化与硅化（石英脉）关系密切。本文介绍了区域地质背景、分析了区域成矿条件,对金矿矿床地质特征进行了详细探讨,并对矿床的成因进行了分析。     

辽西阜新排山楼地区丁屯金矿地质特征及成因探讨

丁屯金矿位于辽宁西部排山楼金成矿带南侧,经开展地质详查评价工作,提交332＋333类金金属资源量1．55吨,为小型金矿床。该矿床赋存于太古宙深成变质岩中,受北西向韧性剪切构造控制,矿区内花岗细晶岩脉与糜棱岩外侵入接触蚀变带是重要的成矿有利部位。矿床成因类型属于变生热液蚀变糜棱岩型金矿。     

金矿带成矿地质特征及找矿标志

金矿带的形成是有规律性的,如果能够结合这种金矿带形成的理论依据,就能找到金带带找矿的标志,结合多种标志综合分析,就能准确的了解该地是否存在金矿带。本文论述金矿带成矿地质特征及找矿标志相关的问题。     

辽宁省阜新县腰马吉沟金矿地质特征

阜新县马吉沟金矿区在区域上位于辽西锦州一阜新金成矿带中,并且具有1／20万化探金异常存在。通过开展1／5万化探水系沉积物测量和地质勘查工作,共圈出金异常6个,发现金铜矿化体4条,矿化体类型为石英脉型和矽卡岩型。从已取得的化探地质资料分析,本区具有较好的地质成矿条件．有望发现较大的金铜矿体。     

贵州望谟交谟金矿地质特征及找矿远景分析

本文以贵州省望谟县交谟金矿地质勘查工作成果资料为基础,通过综合分析研究,获得了该矿区地质特征及找矿远景等方面的系统认识,提出了下步地质勘查工作的建议。     

辽宁五龙金矿北部区地质特征

席大岭区位于辽宁省鞍山市岫岩县东南17km,该区成矿地质条件优越,与林家三道沟金矿特征相似,且预查成果丰富,显示该区具有较好的成矿条件。     

黑龙江吉庆山岩金矿区地质特征及找矿远景

黑龙江吉庆山岩金矿区是二十世纪七十年代评价的老矿区,近几年重新进行了评价,取得了显著地质效果该矿区位于该区位于额尔古纳地块与大兴安岭地槽褶皱系接触带附近的兴隆冒地槽褶皱带北部。通过对该区区域地质背景特征、普查区地质背景特征、成矿规律的研究,认为该区有很好的找矿远景。     

浅成低温热液金矿类型特征及成因

在我国金矿资源体系中,浅成低温热液金矿是重要来源,同国外同类型金矿比较,不管是资源量、数量方面,均具有较大差距。而我国地质构造背景,有利于形成浅成低温热液金矿。文章主要分析浅成低温热液金矿类型特征,探讨其形成原因。     

青海省格尔木市西藏大沟金矿地质特征及控矿因素初探

青海省格尔木市西藏大沟金矿位于格尔木市东南约140 km处的昆仑山南坡,行政区划隶属青海省曲麻来县。2007年,笔者在该地区工作,通过对前人资料分析整理、研究及野外实地调查,对西藏大沟金矿地质特征、矿床成因及找矿标志进行了较系统的归纳与总结,以期对该地区以后找矿工作有一定启发。     

福建政和上山岗金银矿床地质特征

福建政和上山岗金银矿床位于闽西北隆起带与闽东火山断坳带交接部位,金银矿体主要赋存于石英脉中,围岩为多屑凝灰岩、岩屑晶屑凝灰岩等,矿体与围岩界限清晰。矿区内构造发育,其中北东向断裂构造是最重要的导矿和容矿构造;北西向断裂为成矿后期构造,是主要的切割破坏矿体构造。     

果洛龙洼金矿床地质特征及成因探讨

果洛龙洼金矿床是近年在东昆仑造山带东段新发现的一处中型金矿床,通过对矿床的成矿地质条件、矿床地质特征,成矿机理的分析和研究,认为该矿床由早期形成的热水沉积建造提供主要成矿物质来源,在后期动力挤压、变形、变质作用下,成矿物质富集,形成含金石英脉型、构造蚀变岩型、具有典型的韧性剪切带型金矿床特点。     

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。     

Surface plasmon characteristics of nanocrystalline gold/DLC composite films prepared by plasma CVD technique

Composite films containing gold nanoparticles embedded in diamond-like carbon (Au–DLC) matrix were deposited on glass and Si (1 0 0) substrates by using capacitatively coupled plasma (CCP) chemical vapour deposition technique (CVD). Particle size and metal volume fraction varied between 2.7–3.5 nm and 0.04–0.7, respectively with the amount of argon in the methane + argon gas mixture in the plasma. Bonding environment in these films were obtained from XPS, Raman and FTIR studies. Microstructural studies were carried out by SEM, XRD and TEM studies. Blue-shift of the surface plasmon resonance peak (located 540–561 nm) in the optical absorbance spectra of the films could be associated with the reduction of the particle size while red shift was associated with the increase in volume fraction of metal particles. The experimental results have been discussed in light of the core–shell model.     

Biosynthesis of stabilised gold nanoparticle using an aglycone flavonoid,quercetin

Biosynthesis of gold nanoparticles (AuNPs) was obtained by a simple chemical reduction method using a plant-derived aglycone flavonoid, quercetin, as a reducing agent. The aqueous chloroauric acid when exposed to quercetin was reduced and converted to AuNPs in the size range from 20 to 45?nm. AuNPs were characterised by UV–visual spectroscopy, transmission electron microscopy, atomic force microscopy and dynamic light scattering method. These quercetin-mediated AuNPs have shown excellent stability for more than 30 days at 2–8°C. These quercetin-stabilised AuNPs will have an enormous potential for further conjugation studies since no other external stabilising agent is used.     

沙湾组油气地质特征与勘探实践

准噶尔盆地沙湾组以岩性油气藏为主,存在油砂体规模较小、油层薄、储层岩性变化快等勘探难题。2005年,排2井在沙湾组钻遇油层,日产油49.6 t,地面原油粘度为1.6 mPa.s。立足实践、大胆开拓促成了沙湾组浅层、稀油、高产岩性油藏的突破,高精度三维地震技术发挥了关键作用。车排子地区具有多油源输导、多层系含油、多类型富集、多品位共存的复式聚集特点和"三层楼"油气成藏模式。沙湾组轻质油藏油砂体形态与振幅属性具有较好的对应关系,能够通过地震属性有效识别油水边界。稀油油浸为含油性下限,粉细砂岩为岩性下限,渗透率0.022μm2、孔隙度20%为物性下限,油层声波时差大于300μs/m,电阻率大于1.5Ω.m,电阻增大率大于5.5。已发现沙湾组油藏23个。     

Tuning ratios, densities, and supramolecular spacing in bifunctional DNA-modified gold nanoparticles

Methods for combining multiple functions into well-defined nanomaterials are still lacking, despite their need in nanomedicine and within the broader field of nanotechnology. Here several strategies for controlling the amount and the ratio of combinations of labeled DNA on 13-nm gold nanoparticles using self-assembly of thiolated DNA and/or DNA-directed assembly are explored. It is found that the self-assembly of mixtures of fluorescently labeled DNA can lead to a higher amount of labeled DNA per particle; however, the ratio of fluorophores on the nanoparticles differs greatly from that in the self-assembly solution. In contrast, when fluorescently labeled DNA are hybridized to DNA-modified gold nanoparticles, the fluorophore ratio on the nanoparticles is much closer to their ratio in solution. The use of bifunctional DNA-doublers in self-assembly and DNA-directed assembly is also explored to increase the complexity of these materials and control their composition. Finally, tuning the distance between the labels from 2.9 to 5.4 nm was achieved using different hybridized DNA clamp complexes. Fluorescent results suggest that assembling these clamps on nanoparticle surfaces may be possible, although the resulting label spacing could not be quantified.     

Synthesis,optical properties and self-assembly of gold nanorods

Noble metal nanostructures of different aspect ratios were synthesised and optically characterised at individual nanorod level. Rayleigh scattering spectroscopy/scanning electron microscopy measurements were performed to uniquely correlate optical signatures with nanorod size and shape. Scattering spectra of nanorods were dominated by the intense longitudinal surface plasmon resonance (SPR) band in the near-infrared part of the spectrum. This band was found to be highly shape and size dependent. Droplet evaporation techniques and application of dielectrophoretic forces have been used to organise nanorod dispersions into ordered arrays. Depending on the technique and nanoparticle size used, nanorods were found to form one, two or three dimensional (1D, 2D and 3D) superstructures. Within these superstructures nanorods organised themselves into end-to-end lines (1D), side-to-side fashion (2D) or hexagonal arrangements (3D).     

上海地区土壤源热泵空调地质环境问题及对策

根据土壤源热泵空调的原理、特点和上海地区的气候特征、地质条件,通过对土壤源热泵换热器可能引起的热污染和地质环境污染的成因和机理分析,对制约上海地区热泵空调系统发展的地质环境问题提出了相关应对措施。     

Assessing the effect of surface chemistry on gold nanorod uptake, toxicity, and gene expression in mammalian cells

Through the use of various layer-by-layer polyelectrolyte (PE) coating schemes, such as the common poly(diallyldimethylammonium chloride)-poly(4-styrenesulfonic acid) (PDADMAC-PSS) system, the mammalian cellular uptake of gold nanorods can be tuned from very high to very low by manipulating the surface charge and functional groups of the PEs. The toxicity of these nanorods is also examined. Since the PE coatings are individually toxic, the toxicity of nanorods coated in these PEs is measured and cells are found to be greater than 90% viable in nearly all cases, even at very high concentrations. This viability assay may not be a complete indicator of toxicity, and thus gene-expression analysis is used to examine the molecular changes of cells exposed to PDADMAC-coated nanorods, which enter cells at the highest concentrations. Indicators of cell stress, such as heat-shock proteins, are not significantly up- or down-regulated following nanorod uptake, which suggests that PDADMAC-coated gold nanorods have negligible impact on cell function. Furthermore, a very low number of genes experience any significant change in expression (0.35% of genes examined). These results indicate that gold nanorods are well suited for therapeutic applications, such as thermal cancer therapy, due to their tunable cell uptake and low toxicity.