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选择了小秦岭含金石英脉脉石英的显微镜下特征、红外光谱及近脉（矿）围岩全岩爆裂温测等３种包裹体研究方法，对比研究了东闯金、铅矿区和杨砦峪矿区不同含金性石英脉、含矿脉中的富矿、贫矿地段及矿体不同部位的包裹体特征，提出出了石英脉含金性评价及差别矿体剥蚀程度的包裹体指标。 相似文献
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小秦岭金矿田属太古界太华群中段上部的变质岩、超变质岩，其物质成份主要为石英、斜长石、微斜长石等。岩石可钻性8～9级，硅质伟晶岩和石英脉可钻性可达10级以上，属中硬一坚硬、中研磨性和弱研磨性地层。根据岩石物理力学性质，采用小口径金刚石Sc56绳索取芯钻进工艺。小秦岭金矿田中深部的含金石英脉勘查钻孔，一般设计深度在800～1300m之间，钻探施工困难，如起下钻辅助时间增多、钻进效率低等等。经过探索和生产实践，下面介绍两种行之有效的快速钻进技术方法。 相似文献
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小秦岭金矿田属太古界太华群中段上部的变质岩、超变质岩,其物质成份主要为石英、斜长石、微斜长石等.岩石可钻性8～9级,硅质伟晶岩和石英脉可钻性可达10级以上,属中硬-坚硬、中研磨性和弱研磨性地层.根据岩石物理力学性质,采用小口径金刚石Sc56绳索取芯钻进工艺.小秦岭金矿田中深部的含金石英脉勘查钻孔,一般设计深度在800～1300m之间,钻探施工困难,如起下钻辅助时间增多、钻进效率低等等.经过探索和生产实践,下面介绍两种行之有效的快速钻进技术方法. 相似文献
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测试了１３０余件含金石英脉及不含金石英脉的红外光谱试样，查明了该区含金石英脉的红外光谱特征，同时配合其它预测含金石英脉的测量方法，提出了该区含金石英脉的预测靶区，经过初步验证，预测基本上是准确的。 相似文献
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测试了１３０余件含金石英脉及不含金石英脉的红外光谱试样，查明了该区含金石英脉的红外光谱特征，同时配合其它预测含金石英脉的测量方法，提出了该区含金石英脉的预测靶区，经过初步验证，预测基本上是准确的。 相似文献
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王林祥 《吉林大学学报(地球科学版)》1984,(4)
河北迁西金厂峪含金石英脉出露在前寒武系变质岩中。矿区内,轴向北北东复式背斜和它伴生的不同方向、不同力学性质的断裂发育,它们归属新华夏系。含金石英脉矿带是由脉带组成,沿压(扭)性断层破碎带呈北北东向展布。 相似文献
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石英热发光在金矿找矿中的意义 总被引：1，自引：0，他引：1
本文介绍了石英热发光在某些金矿床中矿体的不同部位的变化特征。利用石英热发光特征可以区分、评价不同成矿阶段的石英和石英脉的含金性。总结出含金石英脉的石英热发光曲线为双峰或多峰,而不含金的石英脉则为单峰曲线,并探索了石英热发光作为金矿找矿标志的规律及其意义。 相似文献
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采用电子探针显微分析(EMPA)和粉末X射线衍射(XRD)分析了采自乌拉山金矿床含金钾长石石英脉、石英脉以及其他类型岩石中的10 0多个钾长石样品的化学成分和结果状态,并采用R和Q模式聚类分析、Spearman等级相关分析方法对实验数据进行了统计分析。结果表明,含金矿脉、岩浆热液脉和蚀变花岗岩中的钾长石为中等到最大微斜长石,其特征为K2 O含量高,但相对而言,Na2 O、CaO和BaO的含量低。其他岩石类型中的钾长石的化学成分和结果状态变化很大,可以从透长石、正长石到微斜长石,其特征为K2 O的含量相对较低,但Na2 O、CaO和BaO的含量相对较高。含金样品中的钾长石通常更富K2 O ,表明金的成矿作用与富钾的热液流体和碱质交代作用有关。乌拉山金矿床的成矿作用分为两个阶段,主要的含金钾长石石英脉中的钾长石富K2 O ,形成温度为30 7～379℃,平均为35 3℃;第二阶段含金石英脉中的钾长石含K2 O较低,形成温度为2 6 0～318℃,平均为2 81℃。这些结果表明成矿流体与岩浆热液作用有关,流体朝温度降低、K2 O含量降低的方向演化,K2 O含量高的热液流体和2 6 0～380℃的形成温度有利于金的成矿作用。 相似文献
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不同温度、羧酸溶液中长石溶解模拟实验 总被引：24，自引：2，他引：22
报道了在100℃、140℃下微斜长石在不同羧酸溶液中的溶解实验数据。通过实验表明1)反应温度增高,可增强溶液中阳离子的活性和迁移性,加快长石溶解的反应速率,促进长石的溶解。2)在强酸性条件下,pH值的变化可影响长石的溶解。但在中等酸性条件下,pH值对长石的溶解影响很小。3)羧酸(乙二酸)可不同程度地促进长石溶解,可通过形成乙二酸络合物的形式,增加离子在溶液中的溶解度。但乙酸络合物的作用不明显。长石溶蚀导致岩石孔隙度变大,并且改善孔喉性质。同时,由于乙二酸络合物的存在,增加了Si在溶液中的溶解度,阻止了石英加大和其它成因SiO2的生成,有利于次生孔隙和原生孔隙的保存。4)长石溶解使溶液中Al的浓度较高,但由于铝-羧酸络合物的亲油性比亲水性强,故有一部分Al被分配到油相中,这也是目前大多数油田水中Al浓度偏低的主要原因。 相似文献
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利用激光诱导离解光谱自由定标法对一系列高纯度黄金样品进行定量分析与研究,初步证明了将此方法应用于黄金首饰成分测定的可行性。采用波长1 064nm的Nd∶YAG脉冲激光器激发黄金样品,波长范围为200～760nm的4CCD光纤光谱仪采集发射光谱,对Au元素质量分数范围为85.0%～99.6%的6件黄金标准样品进行激光诱导离解光谱测试。对所得黄金样品光谱中的Au,Cu,Ag三种元素分别选择合适的原子（离子）谱线代入自由定标法模型,通过所得参数拟合得到了所有元素原子（离子）的二维波尔兹曼平面曲线,并以此为基础进行元素的质量分数计算。激光诱导离解光谱自由定标法定量分析黄金样品中Au元素的质量分数与标准值的相对误差〈3%。 相似文献
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Xu Ruisong Guangzhou New Technology Institute of Geology Academia Sinica Jiang Minxi 《《地质学报》英文版》1992,66(4)
The vegetation has been poisoned by gold in the western Guangdong-Hainan region. The gold content ofthe leaves there is as high as 10-1961 times the abundance, the chlorophyll content is 10%-30% lower thanthat of the vegetation in metamorphic terrains and 10%-20% higher than that in granite terrains, and thecarotenoid content is 10%-44% lower than the background value. The water content of leaves is 10% to 20%lower than the background value. The cells of leaves are deformed and broken. The leaf surface shows colourspots and becomes yellow or dark green. The spectral reflectance of the leaf surface is 5%-30% higher than thebackground value: the spectral shape has shifted 5-15 nm to the short wavelength. The gray scales of eanopyon images of Landsat TM and airborne imaging scanner (AIS) are 10%-100% higher than the backgroundvalues. On Landsat TM and AIS false colour images, plants poisoned by gold display a yellow color, whichdisinguishes them from background plants. According to the spectral and image features of goldbiogeochemical effects, the author has constructed a gold information system and expert prediction system,and thus two gold target areas and two gold prospect areas have been identified rapidly, economically andaccurately in the western Guangdong-Hainan region which is extensively covered by vegetation. 相似文献
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Xu Ruisong 《《地质学报》英文版》1992,5(4):411-425
Abstract The vegetation has been poisoned by gold in the western Guangdong-Hainan region. The gold content of the leaves there is as high as 10-1961 times the abundance, the chlorophyll content is 10%-30% lower than that of the vegetation in metamorphic terrains and 10%-20% higher than that in granite terrains, and the carotenoid content is 10%-44% lower than the background value. The water content of leaves is 10% to 20% lower than the background value. The cells of leaves are deformed and broken. The leaf surface shows colour spots and becomes yellow or dark green. The spectral reflectance of the leaf surface is 5%-30% higher than the background value; the spectral shape has shifted 5-15 nm to the short wavelength. The gray scales of eanopy on images of Landsat TM and airborne imaging scanner (AIS) are 10%-100% higher than the background values. On Landsat TM and AIS false colour images, plants poisoned by gold display a yellow color, which disinguishes them from background plants. According to the spectral and image features of gold biogeochemical effects, the author has constructed a gold information system and expert prediction system, and thus two gold target areas and two gold prospect areas have been identified rapidly, economically and accurately in the western Guangdong-Hainan region which is extensively covered by vegetation. 相似文献
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Takenori Kato 《Geostandards and Geoanalytical Research》2007,31(2):89-94
Carbon (25–30 nm in thickness) is the most common coating material used in the electron probe microanalysis (EPMA) of geological samples. A gold coating is also used in special cases to reduce the surface damage by electron bombardment. Monte Carlo simulations have been performed for monazite with a 25 nm carbon and a 10 nm gold coating to understand the effect of a coating film in quantitative EPMA at E0 = 15 keV and 25 keV. Simulations showed that carbon-coated monazite gave the same depth distribution of the generated X-rays in the monazite as uncoated monazite, whilst gold-coated monazite gave a distorted depth distribution. A 10 nm gold coating was 1.06 (15 keV) and 1.05 (25 keV) times higher in k -ratio between monazite and pure thorium than a 25 nm carbon coating at an X-ray take-off angle of 40 degrees. Thus, a 10 nm gold coating is a possible factor contributing to inaccuracy in quantitative EPMA of monazite, while a 25 nm carbon coating does not have a significant effect. 相似文献
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以简单、经济的可见光吸收光谱方法研究了绢云母可见光光谱特征,结果表明含矿石英脉中绢云母可见光光谱在650~700nm之间透射率高,并总结了透射率与Fe含量和寄主脉金品位之间的关系。· 相似文献
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A sulfate-reducing bacterial (SRB) enrichment, from the Driefontein Consolidated Gold Mine, Witwatersrand Basin, Republic of South Africa, was able to destabilize gold(I)-thiosulfate complex and precipitate elemental gold. The precipitation of gold was observed in the presence of active (live) SRB due to the formation and release of hydrogen sulfide as an end-product of metabolism, and occurred by three possible mechanisms involving iron sulfide, localized reducing conditions, and metabolism. The presence of biogenic iron sulfide caused significant removal of gold from solutions by adsorption and reduction processes on the iron sulfide surfaces. The presence of gold nanoparticles within and immediately surrounding the bacterial cell envelope highlights the presence of localized reducing conditions produced by the bacterial electron transport chain via energy generating reactions within the cell. Specifically, the decrease in redox conditions caused by the release of hydrogen sulfide from the bacterial cells destabilized the solutions. The presence of gold as nanoparticles (<10 nm) inside a sub-population of SRB suggests that the reduction of gold was a part of metabolic process. In late stationary phase or death phase, gold nanoparticles that were initially precipitated inside the bacterial cells, were released from the cells and deposited in the bulk solution as addition of gold nanoparticles that already precipitated in the solution. Ultimately, the formation of micrometer-scale sub-octahedral and octahedral gold and spherical aggregates containing octahedral gold was observed. 相似文献
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《International Geology Review》2012,54(11):1674-1679
Potassium feldspars in pegmatites of the Mama district are microclines and orthoclases. In granitoid pegmatites and undifferentiated vein pegmatites, unaffected by postmagmatic processes, the feldspars are represented by orthoclase with the X-ray triclinism (△p) as 0.0-0.4. Wherever postmagmatic solutions were active, in granitoid pegmatitic fields or zonal bodies of vein pegmatites, the feldspars are represented by microcline with △p as 0.5-1.0. At that, the ultimate microcline is recorded only in micaceous zones. There is a connection between △p and Ba content of the feldspars High concentrations of Ba interfere with order in the feldspar crystal structures. There is a definite inverse relationship between △p and Ba in feldspars containing 0.9-2.6% Ba. In feldspars which are low in Ba, △p may vary at one and the same concentration of Ba. Such state of the crystal structure of feldspars is metastable. The magnitude of △p depends upon conditions of the original crystallization and on factors conducive to orderliness in the crystal structure, as well as the interferences, specifically the effect of the admixture elements. — Authors. 相似文献
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A deep “parent” composition for bonanza oreforming fluids at the Sleeper deposit was calculated by the computer program SOLVEQ using fluid-inclusion microthermometric and gas data, and by assuming equilibrium with the following minerals present in vein samples below the bonanza zones: gold, chalcedony, adularia, pyrite, chalcopyrite, and acanthite. The calculated dissolved gold content of 295 ppb is approximately 2 orders of magnitude higher than that assumed for typical geothermal systems. Thus, a gold-enriched fluid appears to have been a principal factor in the genesis of bonanza Au-Ag ores at the Sleeper deposit. Geochemical modelling of possible ore-forming processes using the computer program CHILLER, with the reconstructed ore-forming solution as a starting composition, indicates that boiling most closely reproduces observed minerals and their relative abundances in bonanza ores. The constraint imposed by the association of amorphous silica with gold precludes all of the mixing scenarios modelled, such as mixing with cold and steam-heated groundwaters (acid-sulfate, CO2-rich). Modelling indicates that boiling of a gold-rich deep solution leads to rapid gold precipitation, and that the amount of gold precipitated initially is large relative to other minerals. These factors apparently led to nucleation of colloidal gold particles instead of in-situ gold deposition or coprecipitation with other phases. Gold colloids apparently were entrained in the upward-flowing hydrothermal solutions and grew as they travelled. Upon reaching a critical size (10–100 nm?), they were deposited due to orthokinetic aggregation at an elevation and temperature at which amorphous silica was nucleating and aggregating. 相似文献