共查询到20条相似文献，搜索用时 46 毫秒
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湖南古丈凉亭坳重晶石矿床产于古丈逆断层南东侧之北东向次级断裂破碎带中,赋矿围岩主要为上震旦统陡山沱组黑色页岩、泥质白云岩.矿体呈脉状、透镜状产出,主矿体延伸稳定,矿石质量好.围岩蚀变主要为重晶石化、硅化、碳酸盐化和黄铁矿化.通过对本区矿床地质特征、矿床成因的分析,认为本区重晶石矿为低温热液型矿床,Ⅰ号矿体深部及南东桐木... 相似文献
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旗山锡矿是与燕山三期花岗斑岩有关的岩浆期后热液充填的脉状锡矿床,矿床地质特征是矿体呈脉状、透镜状或分支复合状,锡石硫化物矿石,围岩蚀变主要为云英岩化、绢云母化、弱绿泥石化.通过对矿床的成因进行探讨,为寻找同类型矿床提供找矿思路. 相似文献
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乌日尼图钨钼矿床是近年来在国土资源大调查中发现的一个大型矿床.钨钼矿体主要产于燕山期细粒花岗岩与中下奥陶统乌宾敖包组砂板岩的外接触带中,矿体多呈脉状及透镜状,且明显受构造裂隙控制;矿床成矿在不同部位其矿化形式不同.在成矿母岩--燕山期细粒花岗岩中形成浸染状矿石;同时在与含钙质的板岩接触部位形成夕卡岩型矿石,在乌宾敖包组裂隙中形成热液脉型矿石.其中热液上侵与围岩接触处的细脉状矿床最为主要;矿体围岩蚀变发育,硅化、黄铁矿化与矿化关系最为密切;矿床深部钨钼矿石呈浸染状分布于细粒花岗岩中,后者为成矿母岩;矿床成因属广义的斑岩型矿床. 相似文献
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禾尚田钨矿为新发现并完成了普查评价的钨矿床,分为三个矿段,初步估算资源量达到了超大型规模,矿床类型为"产于碳酸盐岩中的石英脉带型黑钨矿白钨矿矿床"。钨矿体由密集的含钨细脉、网脉、少量薄脉、个别大脉与大理岩化碳酸盐岩组成,矿体与围岩需用化学样品分析结果划分。矿脉由浅往深未明显收敛合并,与典型的石英脉型钨矿所具有的"五层楼"分带模式存在明显差异。矿体赋存于向斜两翼,容矿构造为向斜翼部控制的层间裂隙带、次为节理。工业矿体众多达到171条,密集近平行分布,倾角较陡;矿体倾向延深≥走向延伸长度,钻孔控制钨矿体最深达到1500m,仍未见底。基于勘查规范和矿体特征,选取资源量1000t以上的51条主要矿体,统计出它们的五个地质因素及其类型变量系数,初步将禾尚田钨矿床划分为第Ⅱ勘查类型,同时将详查工程间距调整为100m×100m。 相似文献
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金青顶金矿床地质特征及成矿作用 总被引：1，自引：0，他引：1
金青顶金矿是我国最大的石英单脉型金矿.控矿断裂呈NNE向,具多期活动特点,矿体赋存于断裂呈张性的转折部位;主矿体呈脉状,矿体向NE侧伏,侧伏延深1 080 m,是矿体最大走向长度的2.7倍;矿床有4个富矿柱,赋存于控矿断裂拐弯最大、受张应力作用最强部位,也是多阶段成矿作用叠加部位;矿床为中温热液充填型金矿.在成矿过程中,胶东群是成矿物质的主要来源,岩浆活动是热源并提供成矿热液,构造活动是成矿的动力并提供容矿空间,构成"三位一体"成矿模式. 相似文献
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《四川地质学报》2022,(2):223-227
满丈岗金矿是青海省近几年新发现的又一中型金矿床,累计圈定了金矿体30条(M1M30),其中工业矿体18条、低品位矿体12条。该矿床以石英脉型、蚀变凝灰岩型为主,局部见破碎蚀变岩型。其中石英脉型品位普遍较高,蚀变凝灰岩型次之,破碎蚀变岩型略低。矿体一般长度在275M30),其中工业矿体18条、低品位矿体12条。该矿床以石英脉型、蚀变凝灰岩型为主,局部见破碎蚀变岩型。其中石英脉型品位普遍较高,蚀变凝灰岩型次之,破碎蚀变岩型略低。矿体一般长度在275530m,厚度2.2530m,厚度2.24.02m,平均品位Au 3.314.02m,平均品位Au 3.315.83g/t,估算金资源量15.68吨。该文通过对矿床区域及矿区地质特征、矿体特征、围岩蚀变的分析,对矿床控矿因素、成因、成矿模式等进行了讨论,认为该矿床为中低温热液型金矿床。 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