广东河台金矿区倒转背斜的控矿意义

以岩性、微量元素、稀土元素分析为依据,证实河台金矿区存在一个倒转背斜,该倒转背斜控制了矿床在空间上的分布,其北西翼为北矿带,南东翼为南矿带,核部为中矿带,根据背斜两翼对应关系,认为矿区南矿带具有较好的找矿前景。     

广西贵港龙山矿田金矿床地质特征及成因探讨

贵港龙山矿田是广西重要的金矿化集中区之一,该区位于广西山字型构造前弧东翼,大瑶山复背斜西南倾伏端,龙山鼻状背斜核部,成矿地质条件好,具有良好的找矿前景。文章通过对该矿田的矿床地质特征、矿体特征、矿石特征、控矿因素等方面的分析,认为区内金多金属矿床为受北北西向断裂和裂隙控制富集成矿,属燕山期多期次,高温、中低温岩浆叠加矿床。指出矿床类型主要有次火山岩接触带环状金矿床,破碎带蚀变岩型金矿床,层间破碎带似层状金多金属矿床等三种。     

宁镇地区伏牛山铜多金属矿床稀土元素特征与控矿因素分析

伏牛山矿床位于扬子准地台下扬子台褶束带南京坳陷的北东地段的淮阳山字型东翼反射弧上.伏牛山铜铁铅锌矿床其形成于晚古生代,成因上与矿区内的围岩、岩浆岩及断裂构造关系密切.文章在对伏牛山矿区及外围野外地质调研工作的基础上,通过对区域成矿地质背景矿床地质特征等详实研究、收集样品进行稀土元素地球化学分析、构建矿区三维空间模型等方法,重点深入研究分析了伏牛山岩浆岩和断裂构造对矿体产出空间的控制作用、矿体空间形态和展布特征以及伏牛山矿床控矿因素分析.     

甘肃省成县焦沟铅锌矿地质特征及矿床成因浅析

矿区位于秦岭东西纬向构造带中段,武都山字型构造体系东翼之复合部位。在西成铅锌矿田之厂坝铅锌矿床西部,东为庙沟铅锌矿床,西有人土山、邓家山铅锌矿床。区内之地层与构造均受东西纬向构造带及武都弧形构造的制约。初步认为本矿区属沉积再造矿床。     

陕西金龙山金矿区成矿条件与找矿潜力评价

金龙山金矿区的空间展布严格受背斜和断裂的控制,其中北东向断裂为主要控矿断裂,尤其在背斜核部和断裂交汇处易形成厚大矿体。因此,在强短轴背斜和断裂构造及交汇处是成矿的有利构造条件,本文通过对成矿地质条件的分析表明,在矿床深部及外围具有较大找矿潜力。     

江西德兴银山铅锌矿床深部找矿潜力分析

通过对银山铅锌矿成矿地质特征和控矿地质条件的综合分析,认为该矿床矿体沿银山背斜-断裂带呈南西-北东方向延伸,受断裂构造控制明显,矿床北山铅锌银矿带和九区铜金矿带深部具有很好找矿潜力.     

云南永平县水泄铜钴矿床地质特征及成矿条件分析

在讨论水泄铜钴矿床的成矿地质背景、矿区地质、矿床地质特征的基础上,着重对含矿岩层、控矿构造,矿体特征、矿石特征的研究,从而进一步对其成矿地质条件进行分析。分析结果表明:澜沧江断裂带是该区域导矿作用,其派生倒转背斜的翼部、次级断层是本区容矿构造,两组方向断裂构造交截部位是矿体、富厚矿块的赋存部位。三叠统麦初箐组和中侏罗统花开左组砂岩泥岩互层是最有利的含矿岩性。     

江西淘锡坑大型钨矿构造控矿机制探讨

介绍了江西淘锡坑大型钨矿的地质背景、矿区地质特征及矿床地质特征,详细叙述了该矿床的构造特征,分析了其成矿构造的排列组合形式,探讨了构造的控矿机理,提出该矿区的控岩构造为倒转复式背斜和密溪河近南北向大断裂,受岩体侵入旋扭性应力影响,数组工业矿脉呈"左型-旋扭"形式排列,总结了该矿的富集特点,论述了构造与矿化富集的内在联系。     

浅析东塘子铅锌矿控矿因素及找矿思路

本文在东塘子铅锌矿床地质特征的基础上,结合自己近几年在矿区工作的实际,归纳总结出东塘子铅锌矿床"三位一体"的控矿因素。并紧密结合铅硐山-东塘子"M形"复式背斜东(铅硐山矿段)西(东塘子矿段)构造演化规律及矿区外围类似构造分布特点,提出下步四大找矿思路,为东塘子铅锌矿区地质找矿指明了方向。     

湘西北洛塔矿田铅锌矿床与典型MVT铅锌矿床的对比研究

洛塔矿田处于扬子地台东南边缘,矿田内的铅锌矿床(点)分布受断裂、褶皱构造控制,分布在三个背斜的核部.矿体主要赋存于奥陶纪南津关组生物屑灰岩及硅化灰岩中,呈似层状、脉状.围岩蚀变有硅化、方解石化、白云石化、黄铁矿化等,硅化是最直接的找矿标志.成矿硫质主要源于同沉积的海水硫酸盐,铅主要源于造山带,具壳幔混合源性质.成矿流体为含烷类(CH4)有机质地下热卤水,成矿温度介于95~197℃.铅同位素模式年龄指示矿石的形成明显晚于赋矿层位,矿床成因类型属层控型浅成低温热液矿床.通过对比发现,洛塔矿田铅锌矿床在矿床地质特征、同位素地球化学、成矿流体、矿床成因等方面都与典型MVT矿床具有一定相似性,又具有独特的性质.     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.