共查询到20条相似文献，搜索用时 125 毫秒
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尚未发现的矿产资源潜力的定量预测一直是资源评价的重要工作, 成矿地质体体积法预测资源量是对传统体积资源量估算方法的改进。假设相同大小的成矿地质体有相同的预测资源量, 依据控制区(模型区)内成矿地质体的体积与资源总量计算含矿系数, 运用相似类比法外推含矿系数到预测区, 然后通过估算预测区成矿地质体的体积去预测该区潜在的资源量。其中成矿地质体范围的圈定是该方法的关键步骤, 它需要盆地成钾理论的指导, 充分考虑岩相古地理、沉积建造构造, 含矿岩系等厚线、矿层分布等因素。该方法试验性的应用到了兰坪—思茅盆地钾盐资源量的预测。 相似文献
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根据西藏矿产资源潜力评价的实践成果,针对第一批"全国矿产资源潜力评价"项目中资源量估算过程中存在的问题和不足,结合实践和认识,系统总结已有潜力评价工作中资源量估算过程中的经验和方法,进一步完善了全国矿产资源潜力评价中资源量估算流程和方法,提出了成矿地质体体积法中面积、延深、相似系数等重要估算参数的确定思路和方法。在综合矿产资源潜力评价中资源量估算方法和西藏矿产资源潜力评价实践成果的基础上,应用VBA编写而成的资源量估算辅助工具软件包"地质体积法预测辅助系统",可以很好地应用于矿产资源潜力评价中资源量估算,为新一批全国矿产资源潜力评价项目工作以及其它相关矿产勘查和预测工作提供帮助和参考意义。 相似文献
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固体矿产资源储量估算系统中垂直断面法的实现 总被引：2，自引：0，他引：2
首先简要介绍了固体矿产资源储量估算传统几何法-垂直断面法的基本原理,及运用该方法在储量估算系统中实现资源量自动化估算的流程。其次,通过夹石、特高品位、不平行剖面三个方面,说明了储量估算系统实现过程中需要考虑的各种常见的地质复杂情况,并参照国家标准及估算公式,提出了相应的自动化解决方案。最后,以辽宁省海城市福来屯铁矿矿区为例,以北京大学信息地质研究实验室(GSIS)开发的具有自主知识产权的Minesys矿产资源储量估算系统之传统方法估算子系统为平台,实现了垂直断面法自动估算矿石量,并与该矿区的详查报告进行了对比分析,讨论了估算误差的主要来源。 相似文献
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三维矿产资源评价软件MICROMINE在金属矿山资源储量估算中的应用——以吉林舒兰季德钼矿为例 总被引：1，自引：0，他引：1
描述了吉林舒兰季德钼矿的矿床地质特征、水文地质、工程地质、环境地质条件及选矿试验结果。以该钼矿为例,系统讨论了三维矿产资源评价软件MICROMINE 11.03版的工作原理及流程,并对该矿床进行了资源量估算和验证。采用距离反比加权法进行资源储量估算,获得矿石量31374.14万t,钼金属量245096t,其中,111b+122b矿石量占总矿石储量的80.99%,钼金属量占总资源储量的81.08%;露天开采设计利用资源储量占总矿石储量的91.64%,钼金属量占总资源储量的91.99%。地质块段法和三角网多边形估算法检验结果表明,用三维矿产资源评价软件MICROMINE中距离反比加权法进行资源量估算,方法合理,相对误差较小,结果可靠。 相似文献
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典型构造蚀变岩型金矿远景资源量数学模型与预测 总被引：2，自引：0，他引：2
数学模型是矿床深部资源量定量化预测一个重要手段,其中品位-吨位模型是一个广泛应用的数学模型,在该模型中,远景资源量为研究区源岩中成矿元素总量的函数。利用该模型,计算胶东构造蚀变岩型金矿远景资源量时,发现由于成矿源岩范围难以确定,而使模型应用准确性受到制约。基于断裂带蚀变岩型金矿的特征,修正了品位-吨位模型。在修正后的模型中,远景资源量为蚀变岩总质量的函数,另包括3个参数:蚀变区元素背景含量(由多标度分形决定)、元素工业品位及矿体品位分布分维值。利用修正后的品位-吨位模型,有效地估算了胶东大尹格庄金矿-1000m以上的理想金属量,得出远景矿石量为5.26×107t,金属量为2.89×105kg,与实际地质情况相吻合。 相似文献
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矿石的工业品位是重要的矿石工业指标,随着国家经济政策、科学技术的进步、矿床地质条件及矿石需求程度而变化。开展矿产资源综合评价及综合利用,不仅可以降低圈定矿体的矿石工业品位,增加矿产资源储量,而且可以综合回收共伴生矿产资源,从而提高资源利用的经济效益、社会效益和环境效益。文章以甘肃省白崖沟金矿为实例,说明了综合指标在该矿矿体圈定、资源量估算中的应用情况。该矿床中主要有用组分为Au,共生矿产为Ag,且与Au为同体共生矿产,但矿床中Au、Ag单独均达不到工业品位一般要求。为综合利用矿产资源,采用Ag对Au 0.016的折算系数,制定了(Au品位+0.016×Ag品位)的综合品位Ⅰ方案:边界品位0.5 g/t、工业品位1.5g/t和Ⅱ方案:边界品位1 g/t、工业品位2 g/t两套方案,经论证,从资源利用率、开采技术条件、经济效益等方面比较,确定Ⅱ方案较优。采用Ⅱ方案的综合指标对白崖沟金矿进行矿体圈定连接,比利用一般工业指标估算的资源量大幅增加,金矿工业矿石量增加3.5倍、金属量增加1.7倍,符合矿产资源综合勘查评价规范的要求,达到了充分利用矿产资源、增加经济效益的效果。 相似文献
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辽宁是我国重要的铁矿资源大省,铁矿资源在辽宁省经济发展中起到了资源保障作用。近年来,随着地表矿产资源逐步枯竭,铁矿勘查工作逐步向攻深找盲方向转变。在辽宁省中、大比例尺地质、物探勘察数据综合研究的基础上,按照不同的铁矿预测类型,在全省范围内分预测工作区及预测深度,使用地质参数体积法估算铁矿潜在资源量,圈定辽宁省内成矿远景区,分析辽宁省内重要矿集区,为铁矿攻深找盲、整装勘查部署提供参考。 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