陕西铅硐山-东塘子铅锌矿地质特征及找矿方向

铅硐山由于山上有古人采矿留下许多老硐而得名。1985年西北有色地质勘查局七一七总队提交了地质勘探报告,获铅锌金属量112.13万t。2001年在铅硐山西延(东塘子)提交地质详查报告,获铅锌金属量7.32万t,2002年成立了东塘子铅锌矿。铅硐山-东塘子铅锌矿产在古道岭组灰岩与星红铺组千枚岩界面,地层控矿明显,矿体形态产状受铅硐山-东塘子背斜控制突出,具有典型的背斜控矿特征。东塘子铅锌矿是深部找矿成功的典型范例。从地表矿体露头开始→由表到里→由浅到深→顺藤摸瓜寻找隐伏背斜(矿体)的方法是深部找矿行之有效的方法,值得广泛推广。     

陕西铅硐山-东塘子铅锌矿深部找矿潜力分析

铅硐山-东塘子铅锌矿位于秦岭凤太矿田南部,矿体严格受地层、岩性及背斜构造所控制,成因为热水喷流沉积改造型铅锌矿床。该矿床自发现以来,经过多年工作,虽已提交200万t铅锌资源量,但矿床西延深部矿体隐伏部位仍具有很大的找矿潜力。本文结合近年来深部探矿工作中取得的新进展、新成果、新认识,论述了铅硐山-东塘子铅锌矿床主要矿体在深部的分布状态和找矿潜力。     

陕西铅硐山—东塘子铅锌矿地质特征及深部找矿潜力

铅硐山-东塘子铅锌矿分布于陕西省凤县城东南直线距离14km处,属于三岔镇管辖范围。该矿处于秦岭凤太矿田南部,地层控矿明显,矿体产出受背斜控制突出,背斜控矿特征比较典型,该矿成因为热水喷流沉积改造型。矿床从发现至今,经不断研究,目前探明铅锌资源储量在200万t,但该矿床的西侧深部矿体隐伏部位找矿潜力巨大。文中结合实践,在分析探讨陕西铅硐山-东塘子铅锌矿地质特征进行分析的基础上,对其深部找矿潜力进行探讨,以供参考。     

直流充电法在银洞梁-手搬崖铅锌矿勘查中的应用

银洞梁-手搬崖矿区位于铅硐山矿集小区内铅硐山-东塘子大型铅锌矿床外围,成矿地质背景和成矿构造条件良好。本文介绍了直流充电法在银洞梁-手搬崖铅锌矿勘查中的应用,总结了数据采集过程中的注意事项,结果表明,该方法获得的充电电位异常和电位梯度异常在确定深部矿体延伸方向取得了较好的效果,为后期工程布设提供了物探依据,在区内其他成矿有利部位可推广应用。     

凤县铅峒山-东塘子铅锌矿床找矿实践与认识

通过回顾凤县铅硐山-东塘子铅锌矿床露头、浅部、深部三个地质找矿阶段,认真分析各个找矿阶段的成矿理论、找矿方法和优缺点,进而总结出切合本区的成矿理论和找矿方法,将对当前风太矿田乃至其他类似隐伏铅锌矿找矿具有重要的借鉴和指导意义。     

湖南省临武县鸡脚山矿区钨锡铅锌多金属矿成矿地质条件及找矿前景

临武县鸡脚山矿区钨多金属矿位于香花岭矿田南部,该地区断裂构造发育,燕山早期岩浆活动频繁。在区域范围内因其不同构造体系叠加而形成了鸡脚山矿区的钨锡铅锌多金属矿床。本文主要介绍了湖南省临武县鸡脚山矿区地质、构造、矿床特征、找矿标志及找矿前景。     

广西北山铅锌矿床的矿化特征和成矿机理分析

广西北山铅锌矿床长期以来属于地质勘查找矿的重点区域,为了进一步落实对地区的矿产资源开采工作,以广西北山地区为例,开展铅锌矿床的矿化特征和成矿机理研究。在对广西北山铅锌矿床进行地质勘查的过程中发现,主要出矿区域内的矿物质构造,大多呈现组合矿形式。对区域进一步深入勘查中发现地区矿石呈现显著的地球化学特征,此区域内的矿物资源大多数为派生类产物,因此在此区域内矿产资源通常较为集中。同时,矿区围岩发生蚀变也是广西北山铅锌矿床的主要矿化特征之一,矿物要以石英与钠长石为主,暗色矿化物质相对较少。在此基础上,对地区成矿机理进行深度分析,以此作为后期广西北山铅锌矿床找矿的依据。     

内蒙古金豆子山铅锌矿床构造控矿初析

金豆子山铅锌矿床位于华北地台北缘,天山-兴蒙巨型纬向构造带,是中低温热液矿床.区域构造格局控制了成矿带的分布,在不同的构造单元中具不同的控矿构造形式.该矿区主构造线呈北东向,金豆子山倒转背斜构成矿区主要构造格架,断裂构造亦较发育.成矿前走向NE的断层和成矿后的断层决定了矿床的展布.金豆子山铅锌矿床及该背斜南东翼的(馒头沟)铅锌矿点属一地堑构造控矿.今后找矿的主要方向是倒转背斜南东翼的断裂破碎带,且有望找到同特征、同成因的铅锌矿床.     

陕西铅硐山铅锌矿主矿体深部及外围找矿前景分析

迎合国家地质找矿新思路、新机制的构建平台,充分收集矿山地质资料,结合生产探矿实践,研究成矿地质条件。此外,以热水喷流沉积铅锌矿床理论为指导,在铅硐山铅锌矿深部增储和外围预查探矿工作方面,对主矿体深部及外围找矿前景进行分析,认为铅硐山铅锌矿主矿体深部及外围找矿前景潜力较大。这为加快推进国家整装勘查工作部署,实现找矿重大突破,指导矿山寻找接替资源提供了地质依据。     

云南省楚雄市禄广铅锌矿床地质特征及控矿因素分析

文章通过对禄广铅锌矿床的区域地质背景、矿区地质特征、矿体特征等的分析,总结了禄广铅锌矿床的控矿因素,指出该矿床受地层—构造—岩浆岩三位一体控制,并对该区找矿标志进行了总结,为下一步找矿提供指导。     

Kinematics of the pelvic girdle and the thoracic and lumbar segments in the course of the lateral inclinations and rotations of the spine

Physiological displacements of the trunk are the addition of these of the pelvic girdle and thoracic and lumbar spine segments. For a long time (3), this conjunction had been noticed but without numbered precisions. The purpose of this communication is to appreciate quantitatively, from a series of 16 subjects, the respective share of each components during lateral bending movements in the frontal plan and movements of rotation in the transverse plan. It results from this work that the pelvic girdle presents as reduced amplitude (4 degrees) in lateral bending on the other hand, displacement predominate to the level of thoracic spine (50 degrees). In rotation pelvic displacements are very important (30 degrees), while the spine so thoracic that lumbar has a weak participation (inferior to 5 degrees). Moderated abduction of hips increases by significant manner the motility of the pelvic girdle.     

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.     

Design and analysis of the tunnel connecting the beamcorridor and the spectrum hall of the CSNS

There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project. The length of the tunnel is about 20 m. The shielding design of the tunnel is very significant for the persons working in the spectrum hall beca     

江西省降水集中期及其期间降水量的变化特征及趋势分析

根据江西省地方标准中有关降水集中期的定义,统计1971～2008年4～9月的降水集中期,并用季节性Kendall检验方法做趋势分析.结果表明,1971～2008年4～9月期间,6～8月是降水集中期及其期间雨量较多的月份,4、5、9月是降水集中期及其期间雨量较少的月份.随时间变化,全省6～8月降水集中期及其雨量呈可能增多趋势,4、5、9月呈可能下降趋势.     

优化焊缝金相组织 充分发挥石油用 ERW管的技术经济优势

P2ERW管代替无缝管,用于石油开采所用油管和套管的关键,是确保焊缝的高质量。它不仅需要具备先进的技术装备和完善的检测手段,更需要发挥金相检验对优化各项工艺参数的指导作用,才能从根本上掌握生产优质ERW石油用管的规律。