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湖南宝峰仙地区水系沉积物测量地球化学特征及找矿预测 总被引：1，自引：0，他引：1
《矿产与地质》2017,(5)
在1∶5万水系沉积物测量的基础上,对湖南宝峰仙地区的地球化学特征进行了初步分析。对元素分散富集特征、地区化学异常特征、异常元素组合特征进行了研究,结合区内成矿地质条件对组合异常区进行综合分析,圈定了楠木峡、雷家两个钨锡铅锌多金属矿找矿靶区。 相似文献
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承德庞家沟银多金属矿主要与中生代早白垩世大北沟期陆相火山活动有关,火山管道相附近构造有利部位和岩性物性差异界面为成矿有利部位。通过对研究区的物探异常特征进行研究,重点分析了该区域岩(矿)石电性特征、激电中梯异常特征和激电测深剖面异常特征,并结合该区域地质背景与资料,综合圈定成矿远景区。研究结果表明: 研究区岩(矿)体之间物性差异明显,电阻率与极化率异常可作为重要的地球物理找矿间接标志; 研究区内以近EW向构造为主,同时发育NS、NE和NW向断层。基于激电异常分析方法,在该区域共圈定6个靶区,IP1南段异常是寻找金矿的有利地段, IP6异常存在于银铅锌矿体中,为该区域的进一步找矿提供参考。 相似文献
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《中国地质调查》2017,(4)
承德庞家沟银多金属矿主要与中生代早白垩世大北沟期陆相火山活动有关,火山管道相附近构造有利部位和岩性物性差异界面为成矿有利部位。通过对研究区的物探异常特征进行研究,重点分析了该区域岩(矿)石电性特征、激电中梯异常特征和激电测深剖面异常特征,并结合该区域地质背景与资料,综合圈定成矿远景区。研究结果表明:研究区岩(矿)体之间物性差异明显,电阻率与极化率异常可作为重要的地球物理找矿间接标志;研究区内以近EW向构造为主,同时发育NS、NE和NW向断层。基于激电异常分析方法,在该区域共圈定6个靶区,IP1南段异常是寻找金矿的有利地段,IP6异常存在于银铅锌矿体中,为该区域的进一步找矿提供参考。 相似文献
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高尖子地区位于内蒙古—大兴安岭褶皱系棋盘山中凹陷构造单元内,是冀北重要的成矿地段。区域内第四系覆盖较厚,且当前找矿详查工作开展较少。为了提取有效成矿信息并应用于找矿靶区优选圈定,本研究在该地区开展1：1万土壤地球化学测量工作,对Au、Ag、Bi、Cu、Pb、Zn、Sb、Mo和Mn共9种代表性金属元素含量特征进行统计分析。研究结果发现Au、Ag和Mo元素为研究区内成矿有利元素。运用R型聚类分析对9种元素进行分类处理,划分出Cu-Zn-Mn、Au-Pb-Bi、Sb-Mo和Ag共4组元素组合。采用累频法计算单元素异常下限,并对单元素异常进行成图处理。运用规格化面金属量来评价单元素异常参数特征,并圈定了4处异常靶区和2处异常重点查证区。在异常重点查证区内利用土壤地球化学剖面进行异常查证,圈定2处成矿有利部位。经槽探工程验证,发现4条金银矿体。证明利用土壤地球化学测量能够在研究区提取有效的找矿信息。 相似文献
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五道沟地区位于黑龙江省贺根山—黑河构造结合带的北缘,多宝山至三道湾子成矿带的中部,该区域成矿潜力巨大,是寻找金铜多金属矿的有利地区。为在五道沟地区实现找矿突破开展了地质找矿工作,并以1∶1万土壤地球化学测量数据为基础,采用元素的变化系数、CV1和CV1/CV 2变化系数解释图对土壤地球化学测量的元素进行分析,揭示各元素在空间上的富集分布规律及其成矿潜力。在此基础上,结合区内成矿地质条件和物探异常特征对该区进行找矿预测。研究表明:①Cu、Ag、Zn、Mo、W等9种元素在研究区内成矿潜力较小;Au元素成矿潜力较大。②据物探激电中梯测量显示,在研究区内共圈定2处电阻率异常,其编号为ρs-1、ρs-2。③根据地质-物探-化探异常套合关系在区内圈定了1处找矿靶区,经过对1号靶区进行工程验证发现了3条金矿体,表明五道沟地区具有较好的找矿前景。 相似文献
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黑河市大新屯锑-金矿床位于大兴安岭成矿带东北部,区内构造、岩浆活动频繁.1∶5万水系沉积物Sb、Au、Hg异常强度较高,规模较大,是金及多金属成矿有利部位.为了对区内1∶5万水系沉积物异常进行评价,选定了规模最大的新07Hs-35异常,利用土壤地球化学测量工作方法对异常进一步查证.经土壤地球化学测量工作后圈定Sb、Au、Hg、Ag、As、W土壤地球化学异常多处,以Sb、Hg、Au异常为主,各元素异常浓集中心吻合较好.因此利用槽探工程对圈定的土壤地球化学异常进行了验证,发现了锑-金矿体,从而确定了大新屯锑-金矿找矿靶区,说明地球化学勘查快速确定找矿靶区是成功的. 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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《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