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青海祁漫塔格地区斑岩铜矿的成矿条件和远景 总被引：8，自引：0，他引：8
文章对青海祁漫塔格地区斑岩铜矿成矿带的成矿地质条件进行了研究,其形成于造山带汇聚阶段中后期的活动陆缘环境,与驱龙斑岩铜矿对比具有相类似的成矿地质条件,找矿远景很大.特别是卡而却卡、乌兰乌珠尔、鸭子沟、尕怒大门等地区具有斑岩铜矿成矿的广阔前景,有希望找到新的大型超大型铜矿床.通过对乌兰乌珠尔矿床的解剖,该矿区构造裂隙发育,岩石蚀变强烈.具典型的"斑岩型"蚀变分带:由中心向外依次为强硅化带??硅化钾化带??绢英岩化带??青磐岩化带.成矿元素以铜为主,伴有铅、锌、锡等多种有用组分.岩浆岩、热液蚀变作用、热液运移和矿质沉淀的构造空间控制了矿床的产出.为进一步在该区找矿指明了方向. 相似文献
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广东省新兴县都斛铜矿床处于吴川—四会深大断裂的中部边缘带,其铜成矿活动主要受本区燕山期斑岩体和NE向断裂构造双重控制,已发现的脉状铜矿体产状各异,在空间上整体形成一个不规则的环状,单个矿体呈细脉分布在黑云母二长花岗岩中,并具有浸染状矿化分布在花岗闪长斑岩等斑岩型矿床的矿化特征。通过对该矿床成矿地质特征的综合研究,对比粤西地区及国内类似斑岩型矿床的找矿经验,认为都斛铜矿床具有斑岩型矿床地质特征,处于斑岩矿床外围或顶部的脉状矿体带,具有寻找斑岩铜矿的潜力。 相似文献
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哈日扎矿床是东昆仑成矿带东段地区近年来发现的一处大型铜、铅、锌、银复合矿床,为研究该矿床矿化蚀变规律,在总结成矿地质背景和VI矿带矿床地质的基础上,探讨斑岩-热液成矿特征,分析深部找矿远景。研究表明,NW向断层控制的构造破碎带及岩石节理、裂隙是矿区主要储矿构造,热液脉型银多金属矿体由浅及深含矿脉逐渐变宽大,矿体呈似层状、脉状、透镜状,类型主要以银、铅、锌矿石为主。脉状矿底部出现青磐岩化-泥化-硅化蚀变分带,并出现黄铜矿,具斑岩型-浅成低温热液脉型成矿系列。利用广域电磁法测量在脉状矿深部1 200～1400 m呈“囊”状低阻体,因此,深部寻找斑岩铜矿潜力巨大。 相似文献
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边家大院矿床成因类型根据目前勘查成果认为是与浅成-超浅成侵入岩(脉)有关的热液型脉状铅锌银矿床,主要矿化产于砂板岩、闪长岩中。平面上成矿元素具有明显的分带性,自西向东有斑岩型锡(钼、铜)矿化→隐爆角砾岩型锌(铅、银)矿化→脉状充填型银(铅、锌)矿化;本文根据矿床地质特征分析,对控矿因素进行了总结,认为隐伏的石英斑岩脉(体)是本矿床成矿热源中心,也是成矿流体的主要来源;脉状铅锌银矿体受低次序密集裂隙(断裂)带的控制,并与岩脉、岩脉群密切相关,以脉状充填形式产于其中。 相似文献
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滇西北衙超大型金多金属矿床成因类型及成矿规律 总被引：10，自引：2，他引：8
北衙金多金属矿床的找矿工作近年取得了重大突破,使金矿储量达到超大型矿床规模,共、伴生铅锌、银、铜、铁、硫矿也达到大-中型规模.对北衙矿床的成因类型和成矿规律的综合研究及地质勘查工作成果表明,矿床受控于喜马拉雅期富碱斑岩与T2b碳酸盐岩的内、外接触带,属于与喜马拉雅期富碱斑岩有关的矽卡岩-热液型金多金属矿床.矿床类型包括矽卡岩型、层间破碎带型(含硅-钙面型)、裂隙脉型以及表生作用形成的风化-堆积型.喜马拉雅期富碱斑岩是矿床形成最关键的控矿因素,以斑岩体为中心,从斑岩内部→接触带→外带→远程,成矿元素有从Cu-Au→Au-Cu-Fe→Au-Fe→Au-Fe-Pb→Pb-Ag的分带规律.北衙地区构造-岩浆-流体活动强烈,成矿物质来源丰富,矿化期次复杂且类型多样,成矿空间范围广,成矿地质条件优越,深部及外围仍具有巨大的找矿潜力. 相似文献
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安徽马头矿床马头矿段钼矿是采用了物探、化探、地质基础工作与钻探等综合手段进行勘查发现的矿床,在总结该矿床的成矿地质背景、矿床地质特征的基础上,对矿床的成因类型进行分析。研究认为:钼矿床主要赋存于花岗闪长(斑)岩与志留系的接触带中,另赋存于钾长花岗(脉)岩内及其附近,本矿床应属斑岩型矿床。控矿因素主要有构造(断层、节理、裂隙)及接触带,受侵位作用形成的破裂带控制,岩体接触带附近岩体与围岩中节理、裂隙是主要的容矿构造。成矿作用与钾长石化、石英-绢云母化蚀变有密切关系。矿石类型主要为石英脉型辉钼矿石、细脉状辉钼矿石,本矿床含矿母岩应主要为花岗闪长(斑)岩,成矿流体主要来自岩浆晚期-期后热液,矿床成因类型为斑岩型铜钼矿床。 相似文献
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桃溪环形区是武夷山成矿带南段一个重要的矿集区,目前已探明的主要矿床有紫金山铜金矿、岩背锡矿和红山铜矿等大型矿床,它们是武夷山成矿带、乃至中国东部的典型矿床。本文从几个主要矿床的成矿物质来源、岩浆与成矿的关系、蚀变、矿床成因和成矿模式等方面,总结了桃溪环形区中生代与火山相关的铜多金属矿的区域成矿规律,并在综合分析前人地质找矿工作成果基础上,提出火山坳陷区边部斑岩发育区或火山机构发育区为桃溪环形区铜多金属矿的找矿远景区。 相似文献
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西藏驱龙斑岩型铜(钼) 矿床矿化特征及远景预测 总被引：2，自引：0，他引：2
驱龙矿床位于西藏冈底斯成矿带东段, 成矿条件优越。该矿床为一典型斑岩型矿床, 其铜 (钼) 矿化与喜山期黑云母花岗闪长斑岩、石英二长花岗斑岩时空及成因关系密切, 具典型的细脉浸染型矿化特征, 围岩蚀变发育且具面型分带现象。区域构造演化、成岩成矿时代表明, 冈底斯成矿带内的斑岩型矿化发生于印度与亚洲板块的后碰撞阶段挤压向伸展的转换期。综合地质、化探与遥感等找矿信息, 预测驱龙矿床找矿潜力巨大, 驱龙东段是进一步勘查工作的首选靶区, 矿体剥蚀程度低, 具较大埋深( > 1 000 m) 。强调斑岩型矿化的同时, 应注意岩体接触带附近矽卡岩型以及不同围岩裂隙中的脉型多金属矿的找矿工作。 相似文献
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陆日格斑岩钼铜矿床为近期于青海南部三江北段发现的斑岩钼铜矿床(点),在矿床野外地质调查基础上,利用室内显微观察、电子探针分析技术,研究了陆日格矿床矿石组构、成分及伴生元素Mo、Cu、Pb、Zn、Ag、Re等的赋存状态。研究表明,陆日格矿床以浸染状、细脉状构造为主,发育大量石英-多金属硫化物脉、石英-绢云母-多金属硫化物脉和石英-碳酸盐脉等。根据矿床矿化产出及矿石组构特征,进行了成矿阶段划分。陆日格矿床具备较全的斑岩热液-期后热液矿床的矿化元素组合,表明其良好的找矿潜力。 相似文献
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S. Viswanathan K. Surya Prakash Rao B. Mahabaleswar 《Journal of the Geological Society of India》2013,82(6):621-627
Komatiites are mantle-derived ultramafic volcanic rocks. Komatiites have been discovered in several States of India, notably in Karnataka. Studies on the distribution of trace-elements in the komatiites of India are very few. This paper proposes a simple, accurate, precise, rapid, and non-destructive wavelength-dispersive x-ray fluorescence (WDXRF) spectrometric technique for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites, and discusses the accuracy, precision, limits of detection, x-ray spectral-line interferences, inter-element effects, speed, advantages, and limitations of the technique. The accuracy of the technique is excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Zr, Nb, Ba, Pb, and Th and very good (within 4%) for Y. The precision is also excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th. The limits of detection are: 1 ppm for Sc and V; 2 ppm for Cr, Co, and Ni; 3 ppm for Cu, Zn, Rb, and Sr; 4 ppm for Y and Zr; 6 ppm for Nb; 10 ppm for Ba; 13 ppm for Pb; and 14 ppm for Th. The time taken for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in a batch of 24 samples of komatiites, for a replication of four analyses per sample, by one operator, using a manual WDXRF spectrometer, is only 60 hours. 相似文献
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奥地利安东帕有限公司 《岩矿测试》2009,28(3):306-306
最新的流行病学研究表明,空气中较高浓度的悬浮细颗粒可能对人类的健康有不利的影响。根据该项研究显示,由于心脏病、慢性呼吸问题和肺功能指标恶化而导致死亡率的升高与细尘粒子有关。这些研究结果已经促使欧盟于1999年4月出台了限制空气中二氧化硫、二氧化氮、氧化氮、铅和颗粒物含量的法案(1999/30/EC),对各项指标包括对可吸入PM10颗粒的浓度提出了新的限制性指标。PM10颗粒是指可以通过预分级器分离采集的气体动力学直径小于10μm的细颗粒。目前研究的兴趣重点逐步偏向PM2.5这些更细微颗粒物,PM2.5这种颗粒物对健康有明显的不利影响。在欧盟指令2008/50/EC中,对PM10和PM2.5都提 相似文献
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E. M. Prasolov S. A. Sergeev B. V. Belyatsky E. S. Bogomolov K. A. Gruzdov I. N. Kapitonov R. Sh. Krymsky V. O. Khalenev 《Geochemistry International》2018,56(1):46-64
This paper reports the first results of a study of 11 isotope systems (3He/4He, 40Ar/36Ar, 34S/32S, 65Cu/63Cu, 62Ni/60Ni, 87Sr/86Sr, 143Nd/144Nd, 206–208Pb/204Pb, Hf–Nd, U–Pb, and Re–Os) in the rocks and ores of the Cu–Ni–PGE deposits of the Norilsk ore district. Almost all the results were obtained at the Center of Isotopic Research of the Karpinskii All-Russia Research Institute of Geology. The use of a number of independent genetic isotopic signatures and comprehensive isotopic knowledge provided a methodic basis for the interpretation of approximately 5000 isotopic analyses of various elements. The presence of materials from two sources, crust and mantle, was detected in the composition of the rocks and ores. The contribution of the crustal source is especially significant in the paleofluids (gas–liquid microinclusions) of the ore-forming medium. Crustal solutions were probably a transport medium during ore formation. Air argon is dominant in the ores, which indicates a connection between the paleofluids and the atmosphere. This suggests intense groundwater circulation during the crystallization of ore minerals. The age of the rocks and ores of the Norilsk deposits was determined. The stage of orebody formation is restricted to a narrow age interval of 250 ± 10 Ma. An isotopic criterion was proposed for the ore-bearing potential of mafic intrusions in the Norilsk–Taimyr region. It includes several interrelated isotopic ratios of various elements: He, Ar, S, and others. 相似文献
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Mining induced subsidence can significantly affect mining costs where major surface facilities and natural environment need to be protected. Overburden grout injection is a technology used to control coal mine subsidence by injecting the mine waste material extracted from the coal back into the inter-burden rock during longwall mining. The flowing slurry is here categorised as a nonlinear viscous cohesive (Bingham plastic) fluid. During longwall mining the grout slurry is pumped into the separated beds of the rock mass through a central vertical borehole, which is drilled deep into the inter-burden rock strata above the coal seam. However, a blockage can occur in the injection system when the slurry velocity falls below a certain critical threshold velocity, indicating a material phase change from cohesive-viscous to cohesive-frictional. In situ field injection tests through boreholes have been simulated at a smaller scale at the CSIRO laboratory in Brisbane by pumping the slurry through a radial disk (gap = 4 mm) from its centre. Laboratory experiments indicate a general, nonlinear, cohesive, viscous, frictional model for shear behaviour of the slurry, in which the material shear parameters are functions of the disk radial distance. Complete dimensional and dimensionless analytical solutions have been developed based on an approach related to Bingham–Herschel–Bulkley fluid mechanics. The derived formulae include relations for minimum pump pressure, local pressure and pressure gradient, wall shear stress, volume rate, velocity and velocity gradient. The theoretical results match the experimental measurements. The experiments covered slurries with maximum particle sizes of 0.5 to 2 mm with about 50% being larger than 100 µm. The viscosities at the various solids concentrations were measured with a standard torsion viscometer. This study differs from the previous research in several distinct aspects, namely, consideration of the variable shear parameters rather than fixed values, inclusion of total nonlinear behaviour, and implementation of a friction function to mimic behaviour of the deposited and consolidating stiff slurry, which can cause a significant pressure rise as a result of the increased shear resistance. 相似文献
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Between 1985 and 1991, two new mountain protected areas (MTNPA) covering more than 35,000 km2 and based on participatory management models — the Makalu-Barun National Park and Conservation Area, Nepal, and Qomolangma Nature Preserve, Tibet Autonomous Region — were successfully established through the collaborative efforts of Woodlands Mountain Institute and conservationists in China and Nepal. Characteristics common to both projects include the importance of establishing (1) effective rationales, (2) local support constituencies, (3) a senior advisory group, (4) a task force, (5) linkages between conservation and development, and (6) fund raising mechanisms. The lessons derived from the experiences of Woodlands Mountain Institute are of significant value to others in preserving MTNPA. Increased collaboration and communication between all interested in conservation, however, will remain a critical component for expanding mountain protected area coverage to throughout the world. 相似文献
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岩石密度和超高压岩石折返速率 总被引：1，自引：3，他引：1
在常温常压条件下对中国大陆科学钻CCSD主孔100-3000米岩心样品进行了密度测量,建立了密度连续剖面,并界定了不同超高压岩石的密度值。通过对比高温高压物性实验资料,岩石密度随着退变程度增强而降低,榴辉岩密度变化序列为3.52g/cm3→3.49g/cm3→3.07g/cm3→2.93g/cm3。超高压长英质岩石密度变化序列为3.00g/cm→2.80g/cm3→2.65g/cm3。上述实验资料是讨论不同折返阶段岩石所受浮力的基础,为研究折返速率大小提供了基本参数。本文通过折返板块运动平衡时,上浮力与粘滞力平衡这一关系式,定量研究了大陆俯冲板块的折返速率,认为密度差产生上浮力从而引起折返,温度对板块折返速率的影响最为显著;密度差大小、折返角度、折返板块大小对折返速率也有直接的影响。定量模拟分析表明,在温度高于850℃时,板块的折返速率可以超过100mm/a;当温度降至700℃时,折返速率则低于1.5mm/a。作者认为在折返早期,温度较高,板块快速折返至60-70km榴辉岩相深度;随着传导散热,温度降低,板块以较慢的速率折返至中下地壳。折返速率的估算表明,浮力是板块折返第一阶段(从>100km深部折返至<40km的中下地壳)的主要驱动力。 相似文献
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《Applied Geochemistry》2001,16(2):137-159
Five hundred and ninety-eight samples of terrestrial moss (Hylocomium splendens and Pleurozium schreberi) collected from a 188,000 km2 area of the central Barents region (NE Norway, N Finland, NW Russia) were analysed by ICP-AES and ICP-MS. Analytical results for Al, B, Ba, Ca, K, La, Mg, Mn, Na, P, Rb, Si, Sr, Th, U and Y concentrations are reported here. Graphical methods of data analysis, such as geochemical maps, cumulative frequency diagrams, boxplots and scatterplots, are used to interpret the origin of the patterns for these elements. None of the elements reported here are emitted in significant amounts from the smelting industry on the Kola Peninsula. Despite the conventional view that moss chemistry reflects atmospheric element input, the nature of the underlying mineral substrate (regolith or bedrock) is found to have a considerable influence on moss composition for several elements. This influence of the chemistry of the mineral substrate can take place in a variety of ways. (1) It can be completely natural, reflecting the ability of higher plants to take up elements from deep soil horizons and shed them with litterfall onto the surface. (2) It can result from naturally increased soil dust input where vegetation is scarce due to harsh climatic conditions for instance. Alternatively, substrate influence can be enhanced by human activity, such as open-cast mining, creation of ‘technogenic deserts’, or handling, transport and storage of ore and ore products, all of which magnify the natural elemental flux from bedrock to ground vegetation. Seaspray is another natural process affecting moss composition in the area (Mg, Na), and this is most visible in the Norwegian part of the study area. Presence or absence of some plant species, e.g., lichens, seems to influence moss chemistry. This is shown by the low concentrations of B or K in moss on the Finnish and Norwegian side of the (fenced) border with Russia, contrasting with high concentrations on the other side (intensive reindeer husbandry west of the border has selectively depleted the lichen population). 相似文献