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水电化学方法寻找运积物覆盖区的金矿床 总被引：4，自引：1，他引：4
应用水电化学方法在我国胶东西部金成矿区进行了首次试验.该方法是基于矿体周围离子晕的存在,在外电场作用下,离子晕中的金属离子向阴极聚集,并被选择吸附剂所吸附,然后根据吸附剂中金属离子的含量来评价其含矿远景.这次试验在已知金矿区发现了清晰的Au异常,并在矿区外围新发现了一些异常.对部分异常进行检查的结果表明,金异常主要与原生金矿化和砂金矿有关,并新发现了两处金矿点和一些有找矿意义的新异常,为该区的金矿普查提供了新的靶区.这种水电化学方法能最大限度地地集水中的金属离子,加大了地球化学勘查的有效深度,降低了对分析方法灵敏度的要求,能抑制水中金属离子因季节变化的影响,为隐伏砂金矿的普查提供了一种新的有效手段. 相似文献
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A new electrogeochemical extraction technique has been used in cooperation with the field paper chromatographic method to determine gold which migrates in ionic form and is deposited on the electrode inserted in the soil. The technique has been tested with encouraging results in several Au areas. The results indicate that distinct Au anomalies can be discovered which have been buried by transported overburden. 相似文献
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Mohamed Abdallah Gad Darwish 《Environmental Earth Sciences》2017,76(23):804
The Marahiq area represents a portion of the Pan-African belt from the Neoproterozoic age in south Egypt and includes metamorphosed ultramafic rocks, metavolcanic rocks, and granodiorite pluton. The area is characterized by the ancient abandoned Au mine and the recent active talc mines. The present paper provides a preliminary assessment of stream sediments for gold (Au) placer and environmental hazard. Steam sediments from 36 stations were analyzed using ICP-MS for determining the concentration of 53 elements. Various statistical techniques, graphical representations, a set of complementary sediment quality assessment methods, and different mapping methods have been applied. The results showed that Au and the investigated elements were influenced by long history of the ancient mining activities and weathering processes, leading to elevate Au and some heavy metal(loid)s concentrations and exhibit enrichment ratios as follows: Te > As > Au > Cu > Cd > Co > Ni > V. Whereas Cd, Co, and V were attributed to geogenic origin, As, Au, Cu, Ni, and Te were derived from anthropogenic mining activities. It is found that the anomalies of Au and the element of interest are indicative of Au placer and point out a new perspective Au-sulfide mineralization hosted along the favorable tectonic zones that were the main source of Au placer. Both As and Te are good pathfinders to explore Au placer and related mineralization. Environmentally, the excess of As, Cu, Ni, and Te could generate moderate levels of contamination and low level of ecological risk in the sediments. Although As, Cu and Ni posed medium–low potentially adverse effects and low toxicity levels, they cannot cause harmful influences on biological life. Accordingly, streambed sediments are considered as safe and acceptable as inoffensive materials for environmental management. Overall, this study is as reference values for governmental organizations for appraising future environmental pollution in the area. Also, it is fruitful for Au placer and promising with success for Au exploration along the shear zones and strike-slip faults. 相似文献
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自然重砂测量是矿产勘查的重要手段之一。如何充分提取自然重砂测量数据所蕴涵的矿化信息,发挥其在矿产资源调查中的作用是一个现实问题。重矿物的被剥蚀、再沉积是自然重砂异常形成的重要过程。在充分考虑自然降水的汇集路径的前提下,以汇水区域边界确定范围是对自然重砂异常客观的解释。区域成矿模式研究、地球化学和人工重砂资料对自然重砂测量数据应用是重要的补充。笔者通过蔚县地区1∶20万自然重砂测量数据的分析,对其中有关全面认识异常、合理确定异常、勘查方法的综合应用、软件平台的使用及在矿产开发程度较高地区寻找未知资源的途径等方面做了一些探讨和尝试。 相似文献
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东天山成矿带是我国重要的铜金矿集区之一.复杂的地质演化历史导致了成矿地质背景的复杂性、成矿作用的多期性和多样性.本文分别应用地质统计学和多重分形滤波法(S-A法)对Cu、Au含量数据进行分析,获取了不同层次的致矿异常信息.结果表明:(1)东天山地区Cu、Au含量最大变程分别为80 km和47 km,最大变程方向与深大断裂走向一致,表明Cu、Au异常受深大断裂控制;Cu含量分布比Au具有更好的连续性,Cu的含量变化表现出较强的结构性特征,而Au的含量变化表现出更强的随机性特征.(2)泛克立格法和多重滤波分形分析中的低通滤波获取致矿异常信息具有相似性,均反映Cu、Au区域上的分布趋势和浓集特征.(3)多重分形滤波法能够提取不同层次的致矿异常信息,包括区域异常信息和局部异常信息,S-A法揭示的局部Cu异常突出了某些低背景中的隐蔽异常;而呈北东向串珠状分布的局部Au异常,可能暗示区内NE向次级断裂系统控制了金矿床的发育. 相似文献
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N.A. Roslyakov 《Journal of Geochemical Exploration》1984,21(1-3)
Gold deposits overlain by allochthonous (transported) sediments more than 10 m thick give very weak geochemical anomalies in the soils. Hence, information on the mode of occurrence of Au in overlying soils and sediments is important for the interpretation of these weak anomalies. The different forms of Au in the overburden are zonally distributed around subcropping deposits. Lateral hypergene (supergene) zoning in the overlying sediments and soils may appear as increasing contents of native Au particles, and as increasing amounts of water-soluble Au complexes which may change in composition with approach to the Au deposits. In regional background soils, allochthonous sediments, and the weathered crust Au is predominantly concentrated in the insoluble mineral residue, in fulvic acids, and to some extent in insoluble organic residues and humic acids. Only 4–7% of the Au occurs as free native particles. In unconsolidated sediments of auriferous fields native Au, Au in insoluble residues, and Au in fulvic complexes predominate. Au is sporadically contained in pore solutions and can be removed by potassium iodide and aqueous extracts. High concentrations of native Au particles in combination with the soluble complexes, Au in pore solutions, and Au determined by potassium iodide and aqueous extracts are extremely significant indicators of the proximity to buried Au deposits.Based on thermodynamic calculations derived from the results of electrodialysis and from fractionating studies utilizing exchange resins and from major ligand concentrations in experimental solutions, it has been shown that an increase of sulphate and a decrease of Au in complex forms occurs in oxidizing environments outward from buried deposits, toward neutral and alkaline conditions. The sequence of changes of the forms of dissolved Au upward in hypergene (supergene) zones is controlled by the change of conditions from reducing to oxidizing. The variation of the mode of occurrence of Au in unconsolidated sediments, as well as the presence of soluble complexes of Au in low-contrast total-gold anomalies, serve as important criteria of the proximity to Au deposits. 相似文献
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The present work aims to estimate Au-anomalous distribution patterns, the optimum grain size fraction and pathfinder elements for gold placer. The obtained data of analyzed elements (Au, Ag, As, Ba, Cd, Co, Cr, Cu, Fe, Ga, Hg, Li, Mn. Mo, Ni, Pb, Rb, Sb, Se, Sr, Te, Ti, V, Y and Zn) in both the fine (?0.25 mm) and coarse (?1 mm+0.25 mm) grain size fractions of 32 dry stream sediment samples, which have been derived from metamorphosed Island Arc volcanic rocks of Late Proterozoic age, revealed that most of the analyzed elements in both grain size fractions are asymmetrically distributed and did not pass the tests of normality. The coarse grain size fraction appears to be the better size fraction for Au detection and can be considered as the optimum grain size fraction for future application in regional stream sediment surveys. The presence of Au anomalies in the upper part of the stream and beside the mine is either sourced by the main Au-mineralization or new potential extension of the mineralization in the study area. Silver, Cd, Se, Zn and Te can be considered as useful pathfinder elements for Au in the coarse grain size fraction, and they may be used for future geochemical exploration for Au in the area. Recommendation of the authors is pointing to perform lithogeochemical survey in the eastern and western parts of the mine. 相似文献
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山东省沂源县金星头地处沂源-沂南金及多金属成矿带北部,该成矿带位于中国东部矽卡岩金多金属矿带中北部,属于环太平洋带组成部分。通过对该区的地质、地球化学特征等分析,运用1∶1万土壤地球化学测量方法,发现了一批以Au为主的化探异常,对部分异常运用岩石地球化学测量和探槽进行查证,发现具有工业品位的金铜矿（化）体5处,提出下一步找矿的工作重点地段,即在中生代燕山晚期中偏碱性或中酸性侵入杂岩体与寒武纪朱砂洞组、馒头组白云岩、灰岩等接触部位及两侧寻找接触交代型（矽卡岩）金铜矿床。 相似文献
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黑河市大新屯锑-金矿床位于大兴安岭成矿带东北部,区内构造、岩浆活动频繁.1∶5万水系沉积物Sb、Au、Hg异常强度较高,规模较大,是金及多金属成矿有利部位.为了对区内1∶5万水系沉积物异常进行评价,选定了规模最大的新07Hs-35异常,利用土壤地球化学测量工作方法对异常进一步查证.经土壤地球化学测量工作后圈定Sb、Au、Hg、Ag、As、W土壤地球化学异常多处,以Sb、Hg、Au异常为主,各元素异常浓集中心吻合较好.因此利用槽探工程对圈定的土壤地球化学异常进行了验证,发现了锑-金矿体,从而确定了大新屯锑-金矿找矿靶区,说明地球化学勘查快速确定找矿靶区是成功的. 相似文献
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张八岭—管店地区位于皖东张八岭构造带北部,区内已发现多处金多金属矿点,但尚未取得显著突破。近年来,多维分形理论与地球化学勘查相结合的方法已被广泛应用于Au、Cu矿床的找矿勘查工作,其中S-A(能谱密度-累计面积)方法是一种建立在能谱空间上的分形滤波技术,能够利用傅里叶变换对物化探数据进行异常和背景分解。以张八岭—管店地区深部土壤Au元素为例,利用S-A方法对研究区深部土壤中Au元素地球化学场进行异常识别。结果显示,该方法能够有效分离地球化学背景,识别已知金铜矿点的矿致异常信息,在区内已知矿点以外识别出多个Au元素异常区域。研究成果可为进一步找矿勘探提供新的目标和方向。 相似文献
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阿尔泰中高山区域化探金异常成因探讨 总被引：1，自引：0，他引：1
以异常查证和矿床成因研究成果为基础，在异常集／构造带的层次上分析了阿尔泰中高山区金异常的成因，认为异常主要由砂金引起，砂金来源于古风化壳－即古近纪以前的红土型金矿，终极来源可能为以含金石英脉为代表的分散矿化。据此分析，北阿尔泰带的岩金勘查前景应审慎评估，例外的是诺尔特亚带。在此基础上，提出了砂金成因异常的地球化学判别标志，并对冰缘区若干地球化学勘查问题进行了讨论。 相似文献
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低电压偶极子供电方式下的"偶极CHIM"应用效果 总被引：4，自引：0，他引：4
CHIM法自提出以来,一直在进行着不断的改进,但依然存在缺陷,主要表现在设备笨重、操作复杂、成本高、工作效率低,且大多数情况下只提取阳离子态的金属元素.在新的成晕理论的指导下,通过在已知矿区进行低电压(9V干电池)偶极子供电方式下的阴极提取实验,证实其方法有效性的基础上,考虑到阴离子和阳离子都可以提供找矿有用信息的条件下,首次提出了低电压(9V干电池)偶极子供电方式下的"偶极"提取法,并在山东招远尹格庄金矿和新疆210金矿进行了实验研究,结果表明,在已知矿体上方阴离子态元素异常也很发育,将阴离子异常与阳离子异常累加,可清晰地反映深部隐伏矿体的赋存位置.该改进的方法轻便、成本较低,可同时提取阴离子和阳离子态的金属元素,所获信息量大、提取率高,在野外工作方式灵活,适合于野外地质勘查和科研工作. 相似文献
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本文从水文地球化学角度研究了金的表生地球化学作用，并应用热力学方法计算了茅排地区水中金的存在形式，研究了水溶金的迁移和沉淀条件，得出了一个重要结论：是该区水中金的主要存在形式。在此基础上初步探讨了砂金矿的形成条件。 相似文献
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文章分析了安徽宁国石口地区土壤地球化学异常特征并对单元素进行异常评价,发现Cu、Pb、Zn、Bi和Sn异常较弱,Ag、W、Mo异常次之,Ag、W、Mo在黑色岩系具有较高的背景值;Au、As、Sb异常面积大、强度高,异常套合较好,各元素之间具有较好的亲和性;Au为富集元素,变异系数较大,反映矿化不均匀,深部已发现工业金矿体,与构造破碎带有关,与硅化、黄铁矿化呈正相关。通过土壤地球化学测量,在研究区圈定了19个Au异常,3条Au异常带。对异常进一步验证,发现NW向金异常带AuP3异常具有较好的找矿前景。NE向异常带中的AuP1异常和AuP2异常,可能为寒武纪西阳山组钙质泥岩风化导致Au次生富集引起的异常。 相似文献
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北方干旱区水地球化学方法应用效果 总被引：1，自引：0，他引：1
北方干旱区由于雨水稀少，地下水多以井水（或泉水）的形式分布。取样宜于同一季节，以旱季最佳，该季节的地下水中元素含量相对较高。水中微量元素含量很低，多为10－9级，野外取水样时多采用元素预富集技术，如共沉淀技术和聚氨脂泡塑吸附技术等，分析测试主要采用光谱定量分析。水地球化学异常解释时必须紧密结合地质特征和水文地质条件，对异常作出正确解释和恰当评价。通过几个已知点试验研究，并扩大调查面积，对铜铅锌等有色金属矿、金银等贵金属矿、放射性铀矿以及地热等矿产资源，均取得了明显的应用效果，指出了试验区外围具有普查找矿价值的异常多处，特别在厚层疏松复盖层地区开展水地球化学调查应用效果尤为独特。水地球化学方法一般适用于区域普查阶段。 相似文献
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The investigation was conducted within highly and moderately separated highlands and high plateaus where glaciers, stone streams, solifluction, and glacial and fluvio-glacial deposits are widely developed. A capping of Miocene basalts remains in the divides over the Au ore deposits and their oxidation zones. Young water-filled fractures traverse the ore-bearing structures and control the direction of the glacial and river valleys, as well as the location of the lakes, springs, and icings.Gold occurs in small- to average-sized sulphide-Au-quartz veins and in a sulphidized black shale series of Precambrian and Paleozoic age. Both mechanical and hydromorphic dispersion of Au are exhibited clearly in the highlands. The latter is due to the processes of modern oxidation of the Au-bearing sulphide minerals. The anomalies of Au in streams and small lakes are related to supra- and sub-ice waters. In the water of streams Au is present in three forms; colloidal, dissolved, and sorbed. Gold in colloidal form comprises the most ample and contrasty anomalies. The truly dissolved Au is more local and manifests itself close to the source of the stream. Gold sorbed on suspended matter is evident because of a significant removal from the source into the solution. Migration of Au and formation of long (up to 2.5 km) and contrasty dispersions in waters of low dissolved solids is favoured by the presence of organic matter and argillaceous and ferruginous suspensions as well as other sorbents. The anomalies of Au in water either coincide with anomalies in stream sediments over mineralized zones or indicate new mineralized areas not reflected in stream sediments. 相似文献