共查询到20条相似文献，搜索用时 46 毫秒
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正研究区位于福建省邵武市大坪—张厝一带,区内断裂构造发育,萤石矿化强烈,物化探异常明显,萤石矿床(点)众多。综合区内成矿地质特征及成矿规律,区内萤石矿找矿潜力大,新发现的张厝、新坪萤石矿通过进一步工作,有望达到中大型萤石矿床规模。1 区域地质 相似文献
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内蒙古西乌珠穆沁旗地区处于大兴安岭铜、锡、铅、锌、银多金属巨型成矿带西坡西南部,成矿条件优越,区内铜多金属矿(化)点多、成因类型多。通过对西乌旗地区铜多金属成矿条件系统分析,总结了该区铜多金属成矿地质特征,成矿与构造、地层和岩浆岩之间的关系,结合地质、物探、化探、遥感等综合资料,对研究区找矿远景进行了分析,进而圈定出3个找矿远景区,并进一步指出各远景区下一步主攻矿床类型。 相似文献
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《物探化探计算技术》2017,(1)
基于Landsat-8多光谱数据,在西藏自治区狮泉河地区开展了尕尔穷式铜(金)矿遥感找矿潜力分析。根据尕尔穷铜(金)矿床的成矿规律分析研究区的成矿地质条件,结合区域地质资料在研究区内进行遥感矿产地质特征解译和矿化蚀变信息提取,并综合遥感地质解译结果和蚀变信息提取结果,以该区成矿要素为指导,圈定了11个找矿远景区。 相似文献
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贵州独山锑矿集区是中国泥盆系锑矿重要成矿区,成矿地质条件优越,先后在区内发现探明了1个大型、2个中型、5个小型及13个锑矿(化)点。在系统分析锑矿成矿地质特征、地球化学、地球物理、遥感影像特征基础上,总结了独山锑矿集区地层及岩性、构造、蚀变、地球化学、遥感、地球物理找矿标志。在半坡锑矿床深部找矿中,运用"CSAMT解译封闭高阻体+成矿断层"地球物理标志,结合钻探工程发现了新的隐伏锑矿体,实现了深部隐伏矿找矿突破。通过综合研究地物化遥异常信息,依据勘查标志,圈定和优选出丰坡外围、弄江—贵修—甲拜—贝达地区、维寨地区三个找矿靶区。在今后综合勘查中,通过探测技术的优化集成和老(矿)点新评,有望实现新的找矿突破。 相似文献
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对内蒙古陶来托钼多金属勘查区进行地质、地球物理、地球化学综合找矿信息的提取来评价矿区找矿潜力。结果表明,陶来托钼多金属矿是一个以斑岩型钼矿为主的勘查区,发现了斑岩型钼矿床及多处热液脉型铅锌银矿(化)点。成矿岩体为早白垩世花岗斑岩,控矿构造为北东-北北东向断裂。斑岩型钼矿化区与环状激电异常和环状磁异常对应性较好,显示出中低视极化率异常为矿致异常的特征。1∶5万化探异常元素由钼矿化区至铅锌银矿化区表现出Mo、W—Ag、Pb、Zn的侧向分带特征。根据综合找矿信息提取及斑岩型矿床成矿系列建立,指出区内钼矿找矿潜力较大,并预测钼矿区北西侧为热液脉型铅锌银矿的成矿有利地段。 相似文献
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《铀矿地质》2021,(3)
大乌山地区位于桃山-诸广铀成矿带的北段,东邻古龙岗铀矿化集中区,南与兴国铀矿化集中区以兴国红盆相隔。为进一步分析总结区内铀成矿规律,并对区内铀成矿远景进行整体评价,文章在资料综合整理和综合研究的基础上,结合野外地质调查成果,认为:区内铀矿化虽然含矿围岩差别较大,但热液型成矿特征均非常明显,控矿的主要因素相同或相近,为相对统一的区域岩浆-构造-热液活动所制约;区内铀矿化主要赋存于不同期次花岗岩、花岗岩与变质岩的接触部位,不同方向断裂交汇或夹持部位、同时与中基性脉岩、热液蚀变等密切相关,可作为区域上的铀成矿预测要素和找矿标志。通过研究区内铀成矿地质背景、铀成矿地质特征,总结了区域铀成矿模式、铀成矿规律与找矿标志,结合野外地质调查和物、化探测量成果,圈定了1片铀成矿远景区。 相似文献
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通过甘肃省白银厂及其外围地区矿产远景调查项目,共圈定1:5万航磁异常12个、1:5万高磁异常7个、1:5万化探综合异常64个,新发现矿点4处、矿化点6处,矿种有铜、铅、锌等。通过对研究区成矿地质条件、1:5万物化探综合异常特征、矿(化)点分布特征等进行综合分析研究,阐明了该区成矿的时空分布规律和矿产的共生组合规律,总结出区内典型矿床“多位一体”找矿预测模型。综合圈定重点成矿远景区9个,其中A类远景区3处,B类远景区2处,C类远景区4处; 优选圈定找矿靶区4个,其中A类1个,B类1个,C类2个。 相似文献
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西藏多龙矿集区位于特提斯成矿域班公湖—怒江成矿带西段,目前区内已经探明了多不杂等五处超大型斑岩铜矿,并发现拿顿等多处铜矿(化)点,通过对已知矿体成矿规律研究,进一步探讨、圈定找矿靶区,以期获得新的重大找矿突破。 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