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广西博白油麻坡钨钼矿床地质特征及找矿标志 总被引：1，自引：0，他引：1
广西博白县油麻坡钨钼矿区位于博白-岑溪铅锌钨锑金银多金属成矿带内,矿体产于泥盆系下统与花岗闪长斑岩接触的矽卡岩带中或黑云母花岗闪长斑岩、花岗压碎岩、绢云石英片岩中。根据以往勘查成果及综合研究,结合区域矿床对比,认为博白县油麻坡钨钼矿床属中-高温热液-矽卡岩型钨钼矿床和花岗闪长斑岩石英脉型辉钼矿床。该区具有良好的钨钼成矿条件和找矿前景。 相似文献
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中国主要斑岩钨矿床特征 总被引：1，自引：0，他引：1
根据我国主要斑岩型钨矿床地质地球化学资料,斑岩钨矿床产布在特定板块构造位置,受中生代区域深(大)断裂的控制,其成矿与燕山中晚期花岗闪长斑岩、花岗斑岩、石英斑岩和二长花岗斑岩体有关,总结综合了我国斑岩钨矿床成矿特征和成矿模式。 斑岩钨矿床常与斑岩型和其他型钼、铜、锡矿床产于同一成矿区带;成矿具有深源岩浆热液成矿和深源岩浆热液一表生改造成矿系列;斑岩钨矿床成矿于斑岩体内外接触带,而以内带为主;矿体形态有板状、脉状、似层状和岩钟状,矿化类型常见为钨型和钨钼型,矿物简单;矿化-蚀变具有分带特征。 相似文献
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郴县新田岭钨矿床地质特征 总被引：12，自引：0，他引：12
郴县新田岭白钨矿床，是一个大型─超大型矿床。储量巨大的Ⅰ＿５、Ⅰ＿（３０）和Ⅱ＿（２３）号主矿体，皆赋存在燕山早期花岗岩与石磴子组灰岩接触带的凹陷部位，三个主矿体的钨金属量，占矿区总储量的９０％以上。矿床矿物成分、结构构造和围岩蚀变均较复杂，其中晚期复杂矽卡岩与钨矿化关系密切。本矿床的形成，受成矿岩体、有利的围岩和接触带及层间破碎带控制，矿床的成生，经历了两个成矿期５个成矿阶段。矿床成因属气化─高温热液矿床。 相似文献
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广东大宝山矿田船肚钼钨铜矿床的地质特征、成矿规律与找矿方向 总被引：2，自引：1，他引：1
广东大宝山矿田船肚矽卡岩型钨钼铜矿床受船肚花岗闪长岩体接触带的控制,按空间展布分为北矿带和南矿带。浅部钻探和坑道揭露显示:北矿带裂隙密集,由石英网脉型、构造破碎带型及少量矽卡岩型铜钼矿组成;南矿带为矽卡岩型钨钼矿。蚀变特征和矿化类型及成岩成矿年龄表明,该钼钨矿床是与燕山期花岗闪长岩浆活动有关的中高温热液充填交代矿床,成矿物质来源于花岗闪长岩。通过对有利的赋矿围岩分析、控矿构造解析和与大宝山矿区的控矿要素对比分析,认为船肚岩体是沿着寒武系(顶板)与泥盆系(底板)之间的推覆构造侵入的,靠近花岗闪长岩的内接触带是石英网脉型辉钼矿的有利找矿部位,而云英岩化则是有效的找矿标志。在深部和外围矽卡岩带是船肚矿区南、北矿带探寻矽卡岩型钼钨矿体最具潜力的部位。船肚北矿带次英安斑岩体内部、与斑岩体相连通的成矿前断裂带中和构造虚脱部位、块状和似层状矿体外围的断层、裂隙、节理连通部位及层间滑动虚脱部位都是下一步铜多金属矿找矿的有利部位。文章认为船肚矿区深部存在隐伏铜钼多金属矿体的潜力较大,是大宝山多金属矿田找矿突破的重点地段和重要接替资源区域。 相似文献
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郎都铜矿位于义敦-中甸岛弧带南段,红山复式背斜北东翼。矿体主要赋存于张性破碎带、层间破碎带、褶皱的转折端以及外接触带。矿床的形成与围岩性质、构造破碎带和围岩蚀变类型有较为直接的联系。矿床类型属接触交代热液型铜矿床,与成矿有密切关系的岩体为石英二长斑岩,围岩为碳酸盐岩类中的灰岩类,典型的矽卡岩矿物为透辉石,其次为石榴子石,其中透辉石矽卡岩含矿性明显高于石榴子石矽卡岩。根据同位素研究成果,郎都铜矿的成矿年龄大致为214.8±3.8 Ma;成矿的大地构造环境属于造山带环境。成矿物质主要来源为下地壳,次为地幔,具备壳幔混合和深源-浅源混合的特征。矿床的形成是多期次交代作用叠加的结果,具典型的矽卡岩型铜矿床基本特征。 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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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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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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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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《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
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Marta L. PATINO-DOUCE Alberto PATINO-DOUCE Mazhar QAYYUM Roger L. NIELSEN 《Geostandards and Geoanalytical Research》1994,18(2):195-198
We have developed a set of four synthetic standards for the rare earth and high field strength elements designed for use in the determination of those elements in silicates. The base material is a glass nominally at the eutectic of the MgO-Al2 O3 -SiO2 ternary system. The nominal doping level was 2 wt% of the elements as oxides. To avoid problems associated with peak interference, the elements were doped in four separate glasses. 相似文献
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Alexander E. C. Broberg J. S. Kehren A. R. Graziani M. M. Turri W. L. 《Environmental Geology》1993,22(4):353-361
Bellechester, Minnesota, is a small community of approximately 155 residents located on the county line between Goodhue and Wabasha counties in southeast Minnesota's karst region. Bellechester is served by a 21-year-old wastewater treatment facility (WWTF) consisting of three waste-stabilization ponds. On 28 April 1992 six sinkholes were discovered to have drained cell 2 of the WWTF resulting in the loss of approximately 8.7×106 1 of partially treated effluent and about 600 m3 of soil into previously undetected subsurface voids of unknown dimensions. In the week following the collapse, approximately 200 water wells located within a 5-km radius of the WWTF were sampled in an after-the-fact, emergency sampling program. Twelve samples with elevated fecal coliform levels, 18 samples with nitrate-nitrogen greater than the 10 mg/1 standard, and no samples with elevated chlorides were found. However, the elevated levels could not be unambiguously attributed to the WWTF collapse. This is the third WWTF to fail by sinkhole collapse in southeast Minnesota since 1974. All three collapsed lagoons have been located in similar geomorphic and stratigraphic settings. However, at least two lagoons have collapsed in the adjacent area in northeast Iowa, and these lagoons are located at different stratigraphic positions. Twenty-two WWTFs constructed in southeast Minnesota's karst region in the last 25 years have been identified as subject to potential sinkhole collapse. An unknown but significant number of manure storage lagoons, flood control structures, etc., have also been constructed in the karst region and are at risk. Public agencies are beginning to develop plans to deal with the risk associated with existing and future waste lagoons in this environment. The critical hydrogeologic parameters that can be used to prioritize the risk of collapse at existing facilities include: (1) the lithology of the first bedrock beneath each lagoon, (2) the thickness of surficial materials between the lagoon and the bedrock surface, (3) the presence and construction of liners (seepage rate), and (4) the proximity to existing sinkholes. 相似文献