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本文从矿床的描述模式、分布规律、成矿物质来源和成矿模式等4个方面探讨了西秦岭褶皱系层控矿床的共生规律,指出该区层控矿床的共生规律与西秦岭褶皱系地槽发展特点密切相关,其褶皱系的次级活动构造单元之间分界深断裂带的活动规律则是控制该区层控矿床的最基本因素. 相似文献
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苏克塔格能厄肯红柱石矿床位于新疆库尔勒市境内,大地构造位置处于南天山冒地槽褶皱带霍拉山复向斜东部,南邻塔里木地台库车凹陷,是苏克塔格能厄肯-玉奇阿恰红柱石成矿带中的红柱石矿床之一.区内褶皱、断裂、岩浆岩发育,矿床产于中上石炭统塔拉克组中.经长期地质研究认为:该矿床成因属较浅部高温低压接触变质型红柱石矿床. 相似文献
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论述了邓家山铅锌矿床含矿硅质岩.即含矿层或矿源层的特证.矿区构造变形特证,滑断构造的存在,劈理的广泛发育,片内无根褶皱的出现.剪切褶皱和紧闭倒转背斜等和4期构造变形序列.从动力作用成矿观点和动力矿床形成的基本条件,来认识邓家山铅锌矿床地质特征和分析矿床形成机制,提出了邓家山铅锌矿床为层控型动力热液成因矿床的新认识. 相似文献
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洋县铁河石墨矿区大安沟矿段是一个大型晶质石墨矿床,处于秦岭褶皱系印支褶皱带白水江—白河褶皱束的中部,南界以马道断裂为界与康县—略阳华力西褶皱带分开,北界以白水江—留坝断裂为界与南秦岭印支褶皱带留凤关—金鸡岭褶皱束相邻。该石墨矿床赋存于中—上志留统第五岩性层内,属于变成矿床。 相似文献
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湘西沃溪金锑钨矿床褶皱构造及其控矿规律与动力成矿作用 总被引：4，自引：2，他引：4
湘西沃溪金锑钨矿床为一著名的大型综合矿床。本文介绍了矿区地质概况,较详细地研究了区内褶皱构造的发育特征;厘定了仙鹅抱蛋箱状倾伏背斜的存在,并将矿区内的褶皱构造划分为四级,认为不同级别的褶皱在不同期次的构造活动中存在着叠加行为;指出褶皱构造对该矿床具有多期、多级、等距、定位的控制作用,探讨了褶皱构造动力成矿的基本原理,并以此原理为指导,分析了该矿床的成矿机制,认为各期各级褶皱构造的脉动式叠加复合,使其褶皱构造动力成矿作用得到了强化,并最终形成了该矿床及其空间展布格局。 相似文献
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褶皱控矿,是地质找矿勘探中经常能碰到的问题,尤其是背(向)斜对内生热液、变质改造型矿床的控矿作用。 我国许多大中型矿床是以褶皱的形式赋存。这些矿区的勘探和不断开发,在一定意义上看,就是对褶皱控矿规律本身的揭示和研究。许多矿山在开发过程中,逐渐突破了找矿勘探阶段非褶皱控矿这一认识之后,才使矿床由小变大,储量大增,最终才搞清了矿床的构造形态。 沉积矿床和其褶皱之间虽也存在着翼部、鞍部矿物质流动造成鞍、翼厚度等变化,但一般地说并不改变原有沉积的基本特征。而热液和沉积改造型矿床,褶皱除了成为赋矿空间并 相似文献
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广东广宁厚溪铌钽矿床赋存于震旦系C组地层中,区内褶皱构造、断裂构造十分发育.铌钽伟晶岩矿脉受控于NNE向褶皱构造的一组近水平张扭性轴向裂隙系.断裂构造有控矿和破矿的双重作用.通过查明矿床的容矿构造特征以及构造期次与成矿的关系,对寻找新的铌钽伟晶岩矿床具有重要的实践意义. 相似文献
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"表层褶皱"构造系指岩层受两侧压应力作用而形成的褶皱挠曲.这种构造影响深度较浅,一般只涉及到上部地层,常形成上下地层间褶皱的不协调.上部地层褶皱曲率半径小,褶皱紧密;深部曲率半径大,褶皱开阔.褶皱构造对层间矿床的控制是一种常见的现象.一般而言,褶皱规模大者影响较深,规模小者影响较浅.现以赋存于碳酸盐类地层中的马拉格矿 相似文献
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富钟贺地区位于湘桂褶皱系湘中南褶皱带与华夏褶皱带的交汇处,区内良好的成矿条件形成了各种不同类型的钨锡多金属矿床.钨、锡多金属矿床主要赋存于泥盆纪地层中,在空间上从花岗岩内部的云英岩型—矽卡岩矿床→内外接触带的矽卡岩型钨锡矿床→外接触带或远离接触带的锡多金属硫化物型和钨锡石英脉型矿床;成矿时代主要是在燕山中、晚期,成因上... 相似文献
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杉松岗钴(铜镍)矿床产于古元古代裂谷海槽褶皱地带,是国内新近发现的新类型矿床.它赋存于老岭群富硼、碳粘土岩夹硅质岩建造之中.通过对矿床的地质、地球化学特征研究,初步认为该矿床受后期变质热波的强烈叠加作用,形成沉积变质热液叠加改造型矿床.同时阐述了该矿床地质特征及找矿远景. 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