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穷布拉克铜矿产于伊宁铜、铅、锌、铁、铀、钨、锰、煤、白云母成矿带中,属陆相火山热液型铜矿床,成矿作用大致经历了早期火山活动期和中期火山活动期两个成矿期,矿区发现大小不等的数条铜矿体,产于二叠纪火山岩中。在对穷布拉克铜矿床的成矿地质背景及矿区地质特征进行了系统研究的基础上,文章对矿区的矿床成因及找矿标志进行了分析,从而推断该区具有良好的铜矿找矿前景。 相似文献
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羊拉铜矿是金沙江成矿带内规模最大的铜矿床。文章在总结矿床地质特征的基础上,系统开展了断裂构造及构造控矿模式的研究,并进行找矿预测。研究表明:羊拉铜矿区存在近南北向构造带、北东向构造带和北西向构造带等3种断裂构造体系,反映矿区构造经历了4期构造运动,分别对应晚海西期、印支期、燕山期和喜山期;总结羊拉铜矿区构造控矿模式为印支期“岩浆侵入接触构造+层间断裂”和燕山—喜山期“入字型构造+阶梯状构造”。同时依据成矿模式和地质事实,指出江边矿段西侧夕卡岩型矿体、路农矿段东侧深部夕卡岩矿体和里农西侧深部斑岩型铜矿是今后重要的找矿方向,并提出了相应的勘探设计。 相似文献
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大箕山铜矿床地处湖北省鄂东南地区,位于阳新岩体西北段岩体内。铜矿体受NW向构造破碎带控制。通过对其矿床地质特征、流体包裹体以及H-O-S稳定同位素研究,探讨大箕山铜矿床的成矿流体性质、成矿流体来源及硫的来源,基于上述研究结果讨论其矿床成因类型。大箕山铜矿床的形成过程符合典型的矽卡岩矿床成矿过程的"二期五阶段",即矽卡岩期,包括干矽卡岩阶段、湿矽卡岩阶段以及氧化物阶段;石英-硫化物期,包括铜(铅锌)硫化物阶段和银(金)阶段,其中铜(铅锌)硫化物阶段为主成矿阶段。流体包裹体研究表明,主成矿阶段流体具有中低温(140~300℃)、中低盐度(6%~12%NaCleq)特征。石英中流体包裹体的δ18OH2O值为3.51‰~5.92‰,δDV-SMOW值为-75.4‰~-60.5‰,表明其成矿流体主要以岩浆水为主,可能有地层组分的加入;硫化物(黄铜矿、黄铁矿)的δ34S值为-0.6‰~2.7‰,且集中于0~2‰,表明矿石的硫具有幔源硫特征。以上表明,大箕山地区铜成矿作用与岩浆作用密切相关。综合上述矿床地质特征、流体包裹体以及H-O-S同位素研究结果,认为大箕山铜矿床成因类型应为典型的矽卡岩型矿床,为内矽卡岩带的产物。 相似文献
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孔雀山铜矿位于新疆天山博格达晚古生代大陆裂谷带,矿床类型属于热液型.矿区的两条铜矿体分别受两条近似平行的近东西向分布的构造破碎带控制,矿体波状弯曲,有一定的规模.文章在对孔雀山铜矿的成矿地质背景及矿区地质特征进行系统研究的基础上,对矿区的矿床成因及控矿因素进行了分析,从而推断该区具有良好的铜矿找矿前景. 相似文献
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A pilot experiment examined lead leaching from four representative configurations of service lines including: (1) 100% lead (Pb), (2) 100% copper (Cu), (3) 50% Pb upstream of 50% Cu, and (4) 50% Pb-downstream of 50% Cu using a range of flow rates. The cumulative mass of lead release indicated that a typical partial replacement configuration (50% lead downstream of copper) did not provide a net reduction in lead when compared to 100% lead pipe (85 mg for 50% Pb-downstream versus 83 mg for 100%-Pb) due to galvanic and deposition corrosion. The partially replaced service line configuration also had a much greater likelihood of producing water with "spikes" of lead particulates at higher flow rates, while tending to produce lower levels of lead at very low flow rates. After the first 214 days the galvanic current between copper and lead was only reduced by 34%, proving that galvanic impacts can be highly persistent even in water with optimized corrosion control by dosing of zinc orthophosphate. Finally, this experiment raises concern about the low flow rates used during some prior home sampling events, which may underestimate exposure to lead during normal water use, especially when galvanic Pb:Cu connections are present. 相似文献
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Partial lead service line replacement (PLSLR) may be performed when tap water lead concentrations exceed the action level and in association with water main replacement or other maintenance. Partially replacing lead pipes with copper tubing can create a galvanic couple if the lead and copper are connected by a metal coupling, which can potentially enhance lead release by galvanic corrosion. The effect of two types of couplings, brass and plastic, on lead release after a simulated PLSLR was investigated in a set of laboratory-scale experiments. Experiments were conducted in a recirculation flow mode with intermittent stagnation periods using aged lead pipes harvested from Providence, RI. Release of both dissolved and particulate lead was higher for the brass-coupled systems than for the plastic-coupled systems, and galvanic corrosion was the primary cause of significant particulate lead release from the brass-coupled systems. For brass-coupled systems, longer stagnation times resulted in dramatically more release of particulate lead. Sampling of different volumes following stagnation showed that lead release for the brass-coupled systems was locally much higher in the region closest to the coupling. The impact of galvanic corrosion persisted for the six weeks of the experiment. 相似文献
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详细查明青海布茸西—温泉三站铜多金属矿评价区碾廷曲(Hs35甲1)重要矿(化)体产状、顶板埋深及激电特征,可以为钻探布置提供依据。本文采用激电中梯和激电测深相结合的方法对其进行地球物理勘查,中梯扫面圈定三处低阻高激化带,激电测深着重对M2异常进行精细解译。研究结果表明激电中梯和激电测深的联合应用,可以快速圈定铜多金属矿化分布区,分解细化异常,判断出矿化体的产状、顶板埋深等参数,为钻探工程布置提供依据。经钻探验证,M2异常由含银、钴、铜矿化的黄铁矿引起,银、钴、铜与黄铁矿的沉积相关,而黄铁矿分布特征可能与层内凝灰岩的沉积相关。本文根据激电异常圈定极化体并预测隐伏矿化体,可为铜多金属勘查工作部署提供借鉴意义。 相似文献
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北山造山带是我国西北重要的矿集区,虎头山北地区位于该区东段,是寻找铜、金多金属矿床的有利区域。作者以板块构造理论和成矿系列理论为依据,根据区域典型矿床和测区铜金矿床的对比研究,总结了测区矿床的时空展布特征、成矿和演化规律,对测区控矿条件和找矿方向进行了讨论。测区古元古界北山岩群地层和志留系公婆泉组是铜、金矿化的主要含矿层位,燕山期花岗岩同期含矿热液是矿液来源,F1断裂不仅创造了容矿空间,为成矿热液提供了通道,也是重要的成矿控矿构造。结合区内物化探特征,在测区圈出4个成矿远景区和4个优选找矿靶区。 相似文献
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The galvanic corrosion potentials of thirty-eight different waters were measured on site, using 'Oliphant' corrosion cells, for lead-tin solder coupled to copper. A wide range in corrosion potential was found, and the chloride-sulphate ratio had the most significant effect on corrosion potential. Tests to reduce corrosion potentials by dosing sulphate, silicate, zinc and orthophosphate were carried out. Zinc dosing, especially in combination with ortho-phosphate, was the most effective treatment for all waters, but posed problems.
Contamination of tapwater by galvanic corrosion of lead solder occurs early in the life of new plumbing, and risk of exposure to contamination can be reduced by flushing before drawing dietetic water. Best-of-all, lead-tin solder should not be used. 相似文献
Contamination of tapwater by galvanic corrosion of lead solder occurs early in the life of new plumbing, and risk of exposure to contamination can be reduced by flushing before drawing dietetic water. Best-of-all, lead-tin solder should not be used. 相似文献