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《华南地质与矿产》2016,(4)
广西平南县罗平钨矿床位于桂东大瑶山成矿带中部六岑金矿田内,矿体赋存在加里东期花岗斑岩脉中及其外接触带附近。矿石岩性主要为黄铁绢英岩化花岗斑岩和硅化、黄铁矿化变质砂岩,有用金属矿物以白钨矿为主,少量黄铜矿、辉钼矿,矿石构造以细脉浸染状构造为主。围岩蚀变以硅化、黄铁矿化、绢云母化为主,蚀变范围广,总体上呈面状分布。钨矿控矿条件主要有凭祥-大黎深大断裂、加里东期岩浆岩及寒武纪地层,成矿物质主要来自岩浆岩,部分来自地层。成矿时代为加里东晚期,结合矿化特征表明,该矿床成因类型属加里东期斑岩型钨矿床。加里东期花岗斑岩体及其接触带石英细(网)脉发育地段、黄铁绢英岩化蚀变和W-、Mo-Bi-Cu化探异常组合是重要的找矿标志。地球物理资料表明该区深部找矿空间大,地球化学资料亦表明该区找矿前景好,结合矿区成矿地质条件和矿床特征推测该矿床具有寻找大中型以上规模钨矿床的找矿潜力。 相似文献
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河南省新县姚冲钼矿床是大别山北麓新发现的又一典型的斑岩型钼矿床,目前控制规模为中型。矿体主要赋存于花岗斑岩体(脉)外接触带(中元古界蚀变片麻岩),受隐伏岩体和构造控制。辉钼矿化呈浸染状、细脉-网脉状、薄膜状和角砾状产出。围岩蚀变主要有硅化、钾长石化、黄铁矿化、绢云母化、绿泥石化、绿帘石化、方解石化、萤石化和高岭土化等,具典型斑岩型钼矿床的矿化和围岩蚀变特征。其中硅化和钾长石化与钼成矿关系密切。矿床蚀变分带明显,由中心向外侧依次为钾长石化-硅化带(强蚀变带)、硅化-绢英岩化带(弱蚀变带)、硅化-青磐岩化带,由中心向外围蚀变强度逐渐变弱。蚀变作用的强弱与钼矿体的品位高低相对应,硅化和钾化为该区最直接的找矿标志之一。 相似文献
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春都斑岩铜矿床地处著名的印支期中甸-义敦岛弧成矿带南端。矿区出露闪长玢岩-花岗闪长斑岩复式岩体,成矿岩体为印支晚期的花岗闪长斑岩。围绕成矿岩体,围岩蚀变强烈,蚀变分带明显,由中心向外,依次出现硅化钾化带→绢英岩化带→硅化带→硅化黑云母化带→青磐岩化带→绢云母化及泥化带。区内蚀变与矿化关系密切,蚀变类型决定矿化程度,蚀变... 相似文献
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安妥岭岩体位于太行山北段岩浆成矿带,目前已发现一个大型钼矿,成矿地质条件良好,找矿潜力较大.含矿岩体是一个复式杂岩体,主要成分顶部核心为石英花岗斑岩,而花岗闪长斑岩、二长花岗斑岩环绕其构成岩体主体;含矿岩石具有富碱富钾的总体特征,Na2O与K2O随SiO2增加而增加.复式含矿岩体控制了矿化的形态和特征,矿化带呈一个倒扣的不规则筒状,在岩体与围岩接触带形成裂隙式充填的脉状矿体,而岩体深部为隐爆角砾岩状矿化和浸染状矿化,属于斑岩型矿床.安妥岭岩体矿化蚀变分带明显,从矿化中心向外蚀变分带为:钾化-硅化带、硅化-绢云母化带、青盘岩化带、泥化-黄铁矿弱硅化带和矽卡岩带.本文就安妥岭钼矿含矿岩体与成矿的关系进行了研究,对安妥岭钼矿的进一步找矿和探讨太行山成矿带斑岩型钼矿的成矿规律都有重要意义. 相似文献
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《矿产与地质》2017,(1)
达龙矿床位于冈底斯成矿带东段,为一大型钨钼多金属矿床,工程控制其倾向延伸超过1000m。文章系统总结了达龙矿床地质特征,矿床类型为受构造控制的脉状矽卡岩型钨钼多金属矿床,研究发现其垂向上蚀变与矿化分带明显,蚀变分带为(硅化)辉石石榴子石磁黄铁矿矽卡岩化带→(绢云母)磁黄铁矿石榴子石辉石矽卡岩化带→石榴子石黄铁绢英岩化带→黄铁绢英岩绿帘石化带→(石榴子石)绿泥石绿帘石化带,矿化分带为:块状钼钨矿化带→脉状钨(钼)矿化带→细网脉状(铜铅锌)钨矿化带→网脉浸染状铅锌矿化带→脉状铜铅锌矿化带,该矿床蚀变与矿化分带的划分可指导冈底斯成矿带东段同类型矿床的深部找矿。 相似文献
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青海省东昆仑洪水河东地区斑岩铜钼矿找矿潜力分析 总被引：2，自引：0，他引：2
洪水河东地区岩浆活动强烈,石英闪长斑岩、英云闪长斑岩较发育,岩体、围岩及其接触带绿泥石化、绿帘石化、碳酸盐化、钾长石化、高岭土化、迪开石化、绢云母化和矽卡岩化等蚀变普遍且较强烈,具斑岩型矿化蚀变特征。研究区内Cu、Mo、W化探组合异常分布较多,具备典型的斑岩铜矿床的元素组合特征,岩体含矿性与化探异常吻合,且在研究区盘羊沟、乌腊德地区发现了铜钼矿体。据此分析,认为洪水河东地区具备斑岩铜钼矿成矿地质条件,斑岩型铜钼矿找矿潜力较大。 相似文献
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冈底斯北缘沙让斑岩钼矿蚀变矿化特征及与典型斑岩钼矿床的对比 总被引：6，自引：0，他引：6
西藏沙让大型斑岩型钼矿床系冈底斯多金属成矿带首例斑岩型钼矿床,产于印亚大陆碰撞带的主碰撞期.本文分析了其蚀变和矿化特征,指出沙让钼矿床蚀变类型包括钾硅酸盐化(包括钾长石化和黑云母化)、绿帘石-绿泥石化、硅化、绢英岩化(石英-绢云母-黄铁矿化)和粘土化(高岭土化和伊利石-水白云母化).矿化类型主要以脉状矿化、网脉状矿化和... 相似文献
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冀北燕辽多金属成矿带是中国重要的多金属成矿带,带内铜钼矿床多与燕山期中酸性侵入体关系密切,柴家沟钼矿是近年该带上新探获的一座大型斑岩型矿床。文章描述了矿床地质特征,对构造、岩浆岩、矿体特征、矿石质量进行了较细致分析,并探讨了矿床成因,指出了找矿标志。研究结果表明,该矿床是构造-岩浆-成矿作用共同作用产物,矿体主要赋存于燕山期花岗斑岩及周围花岗岩中;围岩蚀变作用强烈,以钾硅酸盐化、黄铁绢英岩化、高岭土化为主;辉钼矿硫同位素测定显示成矿物质主要来源于深源岩浆,成矿流体包裹体盐度w(NaCleq)介于1.7%～18.9%之间,均一温度介于140℃～398℃之间,显示出中等盐度、中温热液特点;成矿压力介于9.83～49.01 MPa之间,成矿深度介于0.33～1.63 km之间;围绕花岗斑岩和F2断层、穹窿构造是直接找矿方向,同时典型矿化蚀变组合、区域多金属地球化学异常和低阻高极化的地球物理异常区域是有利的找矿靶区,柴家沟钼矿床具有超大型钼矿床的找矿潜力。 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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岩石密度和超高压岩石折返速率 总被引：1，自引：3，他引：1
在常温常压条件下对中国大陆科学钻CCSD主孔100-3000米岩心样品进行了密度测量,建立了密度连续剖面,并界定了不同超高压岩石的密度值。通过对比高温高压物性实验资料,岩石密度随着退变程度增强而降低,榴辉岩密度变化序列为3.52g/cm3→3.49g/cm3→3.07g/cm3→2.93g/cm3。超高压长英质岩石密度变化序列为3.00g/cm→2.80g/cm3→2.65g/cm3。上述实验资料是讨论不同折返阶段岩石所受浮力的基础,为研究折返速率大小提供了基本参数。本文通过折返板块运动平衡时,上浮力与粘滞力平衡这一关系式,定量研究了大陆俯冲板块的折返速率,认为密度差产生上浮力从而引起折返,温度对板块折返速率的影响最为显著;密度差大小、折返角度、折返板块大小对折返速率也有直接的影响。定量模拟分析表明,在温度高于850℃时,板块的折返速率可以超过100mm/a;当温度降至700℃时,折返速率则低于1.5mm/a。作者认为在折返早期,温度较高,板块快速折返至60-70km榴辉岩相深度;随着传导散热,温度降低,板块以较慢的速率折返至中下地壳。折返速率的估算表明,浮力是板块折返第一阶段(从>100km深部折返至<40km的中下地壳)的主要驱动力。 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
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Mercury,arsenic, antimony,and selenium contents of sediment from the Kuskokwim River,Bethel, Alaska,USA 总被引：1，自引：0，他引：1
The Kuskokwim River at Bethel, Alaska, drains a major mercury-antimony metallogenic province in its upper reaches and tributaries. Bethel (population 4000) is situated on the Kuskokwim floodplain and also draws its water supply from wells located in river-deposited sediment. A boring through overbank and floodplain sediment has provided material to establish a baseline datum for sediment-hosted heavy metals. Mercury (total), arsenic, antimony, and selenium contents were determined; aluminum was also determined and used as normalizing factor. The contents of the heavy metals were relatively constant with depth and do not reflect any potential enrichment from upstream contaminant sources. 相似文献
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滇东南锡、银、铅、锌多金属矿床主要分布在个旧、白牛厂、都龙3个矿区,而滇东南较大的3个花岗岩体又分别出露在3个矿区或附近.花岗岩体均形成于燕山晚期,岩石化学、矿物成分相似,富含锡、银、铅、锌、钨、铜等成矿元素.矿床主金属元素组合与岩体之间的距离由远而近出现由锡、钨、(铍、铌、钽)→锡、钨、(铁)、铜、铟→锡、铅、锌、银、铟、(锑)有规律的变化.花岗岩浆是成矿物质来源和成矿热源.岩浆侵入初期使上覆地层隆起产生背斜(凹陷部位成向斜);同时使地层产生一系列裂隙、压性断层或层间断裂;岩浆侵入晚期,这些断层再次活动,表现为张性,岩浆产生的含矿热液沿由其活动所造成的断裂迁移、充填、交代、沉淀而形成矿床. 相似文献