广西贺州焦木金矿床地质特征和成因初探

广西贺州焦木金矿床为近年来大瑶山金矿成矿带新发现的矿床,矿区内发育的大宁复式岩体,与区域内成矿作用关系密切。重点阐述了焦木金矿床的矿床地质特征,同时结合矿田范围内重要的龙水金矿床的成矿特征和成因研究,对焦木金矿床的矿床成因进行了初步分析,结果表明,焦木金矿床属于破碎带黄铁绢英岩型金矿床。     

内蒙古大碾子——姜家营子地区金及多金属矿床成矿条件与找矿方向

研究区位于重要成矿区——赤峰—朝阳矿集区的西段,矿集区内金、钼及多金属矿床集中发育。通过对研究区的成矿地质背景、典型矿床特征、地球化学异常特征、成矿条件及找矿标志的分析与总结,认为研究区具有良好成矿条件和较大找矿潜力;确定了研究区着重寻找的矿种应为Au、Ag、Zn、Mo等;主攻矿床类型应为与韧性剪切带有关的金矿床和火山岩—次火山岩型多金属矿床;研究区有多处成矿有利地段,如燕山期花岗岩体与闪长岩体接触带附近,火山断裂与区域断裂的复合部位,蚀变带内等。     

青海大格勒沟脑金矿床地质特征及成矿作用探讨

通过于大格勒沟脑金矿区开展基础地质工作,分析矿床的地质特征和控矿因素,探讨矿床成因和成矿作用。该金矿床矿(化)体赋存于NE向破碎蚀变带中,且受断裂构造控制明显;硅化、黄铁矿化和绢云母化等围岩蚀变与金成矿关系密切;矿床成因类型为构造蚀变岩型金矿床,成矿机理为大规模构造活动及远程岩浆活动所产生的含矿热液沿区域性断裂带运移,并在断裂带内沉淀富集成矿。     

青城子矿田金凤金银多金属矿床地质特征及成因探讨

阐述了青城子矿田金凤金银多金属矿床成矿地质背景及矿床地质特征,并对成矿机制进行了研究和分析,指出了火山喷流沉积变质地层是成矿基础,韧-脆性剪切构造是控矿条件,岩浆热液提供了成矿物质及热动力,是成矿关键。因此,金凤金银多金属矿床属火山喷流沉积—岩浆热液叠加型矿床。     

江西金山金矿田门前山金矿地质特征及找矿方向

门前山金矿床位于江西省金山超大型金矿田北西缘,是矿田内继金山、西蒋、石坞、朱林西等后发现的又一处具有影响的金矿床,找矿成果丰富了金山金矿田深边部找矿理论.矿区内金矿找矿,证实了矿田内金山-朱林、西蒋-石碑等主要剪切带及金矿体倾向上的深部延伸,剪切带的构造岩分带、蚀变分带明显,具有典型的＂超糜棱岩、糜棱岩带-石英、黄铁矿、铁白石化带-金矿化（体）带＂等构造岩-蚀变-金矿化三位一体的成矿特征.矿床成因为受韧性剪切带控制的变质热液型金矿床,具有＂火山沉积-区域变质-动力变质-韧性剪切带控矿容矿-改造叠加＂的综合成矿模式.文章论述了门前山金矿床的成矿地质背景、矿石类型及组构、矿体特征、围岩蚀变特征及控矿韧性剪切带等地质特征,进而提出了进一步找矿的方向.     

甘肃寨上大型金矿床南、北矿带地质地球化学特征对比研究

寨上金矿床以F5断裂为界,可分为南、北2个矿带,在地质、地球化学特征方面存在差异。北矿带位于背斜北翼下二叠统十里墩组地层中,南矿带产于背斜核部中泥盆统安家岔组、上泥盆统大草滩组地层中。流体包裹体研究显示,矿床总体具有中低温、低盐度、低密度、低压力和较浅的成矿深度,南矿带相对于北矿带成矿温度、流体盐度、密度要高,成矿压力以及成矿深度要大。南北矿带可能为一个统一的热液成矿系统,浅部表现为类似于北矿带的微细浸染型金矿化,深部表现为类似于南矿带的脉状富金多金属矿化。     

甘肃省成县龙洞湾多金属矿床矿体特征及成因浅析

龙洞湾多金属矿床大地构造处于昆仑秦岭褶皱区秦岭褶皱系礼县-柞水-海西地槽褶皱带中部。属秦岭东西向构造体系与武都弧形构造东翼的复合部位,即西成矿田东部,吴家山背斜的北翼,厂坝、李家沟两大型铅锌矿床的北西延长部位。大地构造位置极为特殊,具有良好的成矿环境及成矿条件。文章通过对本区矿床地质特征、矿体特征、矿石特征等的阐述及矿床成因的浅要分析,认为变质热液充填交代作用是成矿的主要因素,断裂构造是控矿、容矿的主要因素。矿床严格受接触带、岩石组合、角岩化带、北西向、近东西向张扭性断裂的控制,具有多成矿物质来源,多期次成矿等特点,指出矿床类型属与岩浆侵入活动有关的变质热液充填交代型矿床。     

河南新县胡家湾金多金属矿床地质特征及地球化学特征

胡家湾金多金属矿床位于河南新县高田铺—观音岩一带,区域成矿地质条件良好.研究表明:胡家湾金多金属矿床明显受控于断裂破碎带,构造破碎带中普遍发育金多金属矿化,矿体呈脉状产出,属于构造蚀变岩型金矿床.根据1/10000土壤地球化学测量结果显示:共圈定出综合异常12处,找矿效果良好,如HT-6和HT-9综合异常,均为矿致异常...     

辽西台里金矿床地质特征及矿床成因

台里金矿床位于华北板块北缘燕山沉降带山海关古隆起的东段,是近年来在阜新-台里韧性剪切型金成矿带南西段发现的新矿床。台里金矿床矿(化)体产于新太古代花岗质片麻岩中,沿韧性剪切带的次级脆性断裂分布,受韧性剪切带控制明显,具有多阶段、多期次的成矿特征,其最终成矿期为燕山中晚期,矿床成因类型属于太古宙绿岩建造后韧性剪切带破碎蚀变岩型金矿床。     

甘肃玉门车路沟金矿床地质特征及找矿标志

车路沟金矿床位于甘肃北祁连造山带西段、阿尔金大断裂带南侧.矿床受区域断裂裂隙,尤其受次火山岩体边缘节理、裂隙及接触破碎带控制.文章从成矿地质条件、矿床地质特征等人手,分析了矿床的控矿因素,指出了该矿的找矿标志.     

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.