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1.
核技术在东坪金矿勘查中的应用与研究 总被引：2，自引：0，他引：2
核技术用于金矿勘查的方法主要有Ｘ射线荧光法、γ能谱法、氡（射气）法、中子活化分析法等。本文论述了核技术勘查金矿的地质、地球化学依据、物理基础和方法技术。实践表明：以γ能谱方法（Ｋ，Ｋ／Ｔｈ为参数）可圈定与金矿化有关的钾化蚀变带；以Ｘ射线荧光法可确定含金矿脉的位置，原位划分金矿体边界；中子活化分析法（ＲＥＥ）可揭示深部盲矿体。 相似文献
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新疆北山地区金矿的X射线荧光找矿标志 总被引：4，自引：3，他引：4
文章探讨了在新疆北山地区特殊地质环境下，采用现场Ｘ射线荧光测量找金的方法技术问题。提出适合于该区快速找金的Ｘ射线荧光找矿最佳指标元素为铁、铜、砷，铁和铜的Ｘ射线荧光异常出现在垂直于金矿（化）体走向的两侧，砷的Ｘ射线荧光在金矿（化）体上呈现异常。 相似文献
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本文介绍了抚州－永丰断裂带两侧的构造、地层和岩性情况，并论述了断裂带两侧２个金矿床（虎墟、茅排）和６个金矿点（云山、温泉、梨溪、罗山、桐林、分界）的岩石特征与金矿化，表明金矿化与碎裂岩、粒状石英脉、硅质脉、硅化、黄铁矿化、赤铁矿化的岩石及铜、铅、锌硫化物矿物组合密切相关，同时，金矿化与千枚岩、片岩和石英闪长玢岩也有关。 相似文献
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西藏甲马铜多金属矿床金的叠加成矿 总被引：2，自引：0，他引：2
甲马铜多金属矿床各类矿石中金含量普遍较高。层次主矿体中金主要以细小的自然金形式包裹于斑铜矿和黝铜矿中。矿区多底沟组大理岩（层状主矿体顶板）中的构造破碎带内有独立金矿（化）体产出。喜山期中酸性，酸性岩脉也有不同程度的金矿化。不同产状金矿化持征，矿石ω（Au)/ω（Ag)比值等综合分析后认为：甲马矿区存在两期金矿化，即燕山期海底喷流积成矿作用中的伴生金矿化和与喜山期岩浆作用密切相关的热液型金矿化。 相似文献
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金窝子岩体的地质特征及找金方向 总被引：6，自引：0，他引：6
金窝子矿区内产有石英脉型金窝子金矿和构造蚀变岩型210金矿两座中型金矿床及许多金矿（化）点。金窝子岩体是金窝子金矿床的直接围岩，在金矿的形成中起着重要作用．通过对金窝子岩体的成因、地质特征及含矿性较全面的分析、对比及总结，探讨了矿区及区域找矿方向． 相似文献
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X射线荧光法在燕山地区金矿勘查中的研究与应用 总被引：1，自引：0，他引：1
本文论述了Ｘ射线荧光法勘查金矿的地质、地球化学依据和物理基础，提出了解决基体效应、不平度效应和仪器一致性的方法和技术，燕山地区三个金矿区（点）的应用表明该方法可缩小找金矿的靶区，确定隐伏金矿体位置，划分金矿体的边界。 相似文献
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若尔盖-九寨沟地区产有30余处金矿床（点），另有铜、锑、铁等金属矿产；金矿石分石英脉型和微细浸染型，成因类型可分为构造热液型和构造岩浆热液接触交代型。金成矿与裂谷的演化息息相关，金矿主赋于裂谷强烈期的三叠系地层中，分布受裂谷带控制，金矿化具明显的岩性-岩相选择并与一定的围岩蚀变相伴产出。 相似文献
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西藏甲玛铜多金属矿床金矿地质特征及成矿作用 总被引：1，自引：0，他引：1
甲玛铜多金属矿床按照赋矿岩石不同,共包含产于矽卡岩中的与铜共生的金矿(化)体、产于板岩-角岩中的脉状金矿(化)体、产于大理岩中的脉状金矿(化)体以及产于玢(斑)岩脉中的独立金矿(化)体4种金矿化类型。矽卡岩中的金矿化较强,全矿区金品位×厚度基本都大于1 m.g/t,存在多个富金块段;板岩中金矿化主要分布在矿区外围破碎细粒黄铁矿化硅化板岩中,角岩中金矿(化)体以富含雄黄、雌黄为特征;大理岩中金矿化较弱,矿(化)体通常呈透镜状产出;玢(斑)岩中金矿化主要产于岩脉中的石英脉内。矿石中金的赋存状态主要以独立矿物和类质同像形式存在。独立矿物形式的金以自然金、银金矿存在于铜矿物、石英、黄铁矿等载金矿物内;类质同像形式的金主要存在于以斑铜矿、黄铜矿为代表的铜矿物中。金矿物赋存状态以粒间金、包裹金为主,其次为连生金和裂隙金。笔者以甲玛铜多金属矿床金的地质特征、分布规律及赋存状态为研究基础,推测甲玛金成矿作用与幔源C-H-O流体有关,并初步建立了甲玛铜多金属矿床金成矿模型。此外,提出了运用模型开展区域及矿区下一步找矿工作的建议。 相似文献
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金窝子金矿属于岩浆热液型金矿床,金矿化类型有石英脉型和蚀变糜棱岩型.金多呈独立金矿物形式出现,少许呈分散状,以银金矿为主,次为自然金,平均成色782.金矿物以粒间金、裂隙金、连生金和包体金等形式嵌布于黄铁矿、石英、方铅矿及闪锌矿等主要载金矿物中,且黄铁矿、石英较金属硫化物中占优势,黄铜矿中未见金矿物.金矿物形态各样,粒度以中细粒为主.金矿物特征反映出本区金矿床的成矿物质主要来源于变质岩,成矿作用与华力西、燕山期中酸性侵入岩有关.这与地质地球化学研究所获得的矿床成因认识相一致. 相似文献
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The world‐class Poderosa‐Pataz district is famous for its gold endowment in vertically and laterally extensive quartz‐sulphide veins. Precipitating mechanisms are investigated to determine why gold is so laterally and vertically distributed. Micro‐XRF and LA‐ICP‐MS element mapping of pyrites surrounding gold grains reveals systematic enrichment of As around or near visible gold accumulations. These As‐enriched zones define discordant rims and corridors overprinting pyrites. LA‐ICP‐MS spot analyses performed within and outside the As enrichment zones indicate that As is enriched on average by two orders of magnitude in association with gold. Secondary pyrite transformation by hydrothermal fluids with elevated As‐Au induced a change in the semiconducting properties of pyrite grains, resulting in the precipitation of visible gold particles at the interfaces of As‐enriched zones. The electrochemical precipitation mechanism acted as a filter to extract gold in solution regardless of variations in pressure and temperature, hence explaining the vertically and laterally extensive gold mineralization. 相似文献
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煤中金因其可异常聚集而日益受到重视,其潜在的经济价值又为该贵金属来源提供了新的途径.详细分析了前人对煤中金研究的相关文献,就煤中金的丰度、分布、成因及其工业前景进行了较全面的阐述,并重点讨论了煤中金异常聚集的地质机制,认为存在河流或大气降尘带入泥炭沼泽、同沉积过程中有机物质吸附富集和后生成因等3种主要的富集机制,且当煤被灰化后灰分中金会进一步富集,其富集度可以高出原煤的几倍,甚至几十倍,达到工业利用价值.深入揭示金在煤炭加工利用过程中的迁移、聚集的机制,发展煤中金的提取技术是很有必要的、前瞻性的工作,也是进行煤中伴生金地质经济评价的基础. 相似文献
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In Zhangbaling Tectonic Belt,two types of mineralization,auriferous quartz veins and alteration halos,can observed within many deposits.The pressure of metallogenesis of auriferous alteration halos is much higher than that of quartz vein,the temperatures of metallogeneses of these two types of orebodies are don't the same Geochemistry study indicates that both of them are micro-mesothermal deposits related to Yanshanian granites.The results of proton microprobe analysis of sulphides from the gold deposits in the area show that the "invisible" gold existed in sulphides is in the form of micro inclusions,and the concentration of "invisible" gold in sulphide minerals within quartz vein is poorer than that from alteration halos.Field observation shows that the structural modality of the fractures controlling the orebodies of auriferous quartz vein is different from that of the auriferous alteration zones.The fracture controlling the orebodies of auriferous alteration halos is compress-shear fracture,auriferous quartz vein is controlled by extensive fault.The alteration halos crosscut by auriferous quartz vein.The wallrocks of the former altered strongly and developed alteration zones well.The wallrocks of auriferous quartz vein altered slightly.The results of tectonogeochemical study shows that the concentration of associated metallogenesis elements and intensity of alteration are positively correlated with tectonic deformation strength for auriferous alteration halos.It indicates that it is probably a general character for micro-mesothermal gold deposits due to the multistages of metallogeneses took place.The tectonic environment is the most important fact determining the mechanism of fluid flow and precipitation of gold,and then the types of mineralization and modes of gold. 相似文献
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This study uses a representative dataset of more than 500 vein samples from the Navachab gold deposit containing information on the gold concentration, structural orientation, vein thickness, alteration and host rock type to investigate small scale controls on the grade distribution in the veins in order to obtain a better understanding of the architecture of the Navachab ore bodies. We calculated mean gold concentrations for each vein set in different parts of the mine. We then examine the preferential mineralisation of certain vein sets by setting this grade information into context to other geological parameters such as the structural geology of that particular part of the mine as well as the above mentioned factors structural orientation of the vein, vein thickness, alteration- and host rock type. Our main findings are that vein sets oriented favourably to the stress field and at high angles to the bedding are better mineralised than veins sets oriented at low angles to the bedding. Other factors do not exert a great influence on the gold concentration in the veins. We propose that the gold grade in the veins is influenced by the effectiveness of fluid flow into the veins and by time rates during vein propagation and fluid flow. 相似文献
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Pearlyn C. Manalo Leo L. Subang Akira Imai Mervin C. de los Santos Ryohei Takahashi Nigel J. F. Blamey 《Resource Geology》2020,70(1):1-27
Several high‐sulfidation epithermal gold orebodies in the Mankayan Mineral District were formed in an environment that has been already affected by earlier porphyry‐type mineralization. This study reports the geologic and geochemical characteristics of the Carmen and Florence epithermal orebodies, which are located in the south of the Lepanto main enargite–gold orebody. The gold‐bearing epithermal quartz veins in the Carmen and Florence areas are of two types: (i) the enargite‐rich veins and (ii) the quartz–pyrite–gold (QPG) veins. The two types of veins are mainly hosted by the Cretaceous Lepanto Metavolcanics basement rocks, with minor veins cutting the Pleistocene Imbanguila Dacite Pyroclastics. The mineral assemblages and homogenization temperatures of fluid inclusions indicate that the Carmen and Florence orebodies were deposited by fluids varying from high to very high sulfidation state. The enargite and QPG epithermal veins of Carmen and Florence cut porphyry‐type quartz veinlet stockworks and veins that host polyphase hypersaline fluid inclusions that did not homogenize at or below 400°C. These high‐temperature quartz exhibits distinctly different mineral chemistry from the quartz of the QPG and enargite‐rich epithermal veins. In particular, the Ti content of quartz of the porphyry‐type veinlet stockwork is elevated (>100 ppm), whereas the Ti concentration of the epithermal vein quartz crystals are below detection limits. The Fe concentration of quartz is high in epithermal vein quartz (>300 ppm), whereas nearly undetected in the porphyry‐type stockwork veinlet quartz. Multiple generations of quartz with different mineral chemistry, fluid inclusions morphology, temperature, salinity and bulk gas compositions, and stable isotopic ratios indicate the variable hydrothermal conditions throughout the mineralization history of the Mankayan District. The temperature, pH, sulfidation state, oxidation state, and fluid composition vary among the orebodies in Carmen and Florence areas. Furthermore, the characteristics of earlier alteration affected the apparent characteristics of subsequent mineralization. 相似文献
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黎川岭下金多金属矿处于武夷山成矿带中部,闽西北隆起带西缘,区内经长期强烈的构造叠加活动,导致岩浆侵入上升,构造和岩浆活动提供的大量含矿热流体沿断裂贯入、迁移,从而富集成矿.矿体呈脉状、线脉状、透镜体状贮存于北东东向构造带中,为构造热液蚀变型矿床. 相似文献
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豫陕小秦岭脉状金矿床三期流体运移成矿作用 总被引：30，自引：27，他引：30
位于豫陕交界处的小秦岭脉状金矿是我国第二大黄金产出集中地。流体包裹体研究表明，脉状金矿床石英及碳酸盐矿物中流体包裹体主要有富CO2包裹体、CO2-H2O包裹体和H2O溶液包裹体等三种类型，各热液阶段形成的脉体内有不同的流体包裹体组合。脉状金矿体的形成经历了三期流体成矿作用，第一期形成乳白色石英大脉，它构成了矿脉的主体，流体的性质为富H2O热液，但无金的成矿；第二期(成矿期)流体为中低盐度CO2-H2O-NaCl热液，它叠加在了石英大脉之上，形成(块状)黄铁矿-浅色石英矿体和(网脉状)多金属硫化物-烟灰色石英矿体，成矿期内热液的温度、压力及流体组成的变化是金沉淀成矿的原因；第三期热液又转成低盐度的富水流体，形成石英-碳酸盐脉体，金矿化微弱。 相似文献
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The Mirge-Naqshineh gold district is situated at northwest of Iran with a NW-trending brittleductile shear zone. It is hosted by Precambrian meta-sedimentary and meta-volcanic units traversed by mineralized quartz veins. In terms of cross-cutting relationships and sulfide content three types of quartz veins are identified in the region. Among those, parallel to bedding quartz vein(type Ⅰ) is the main host for gold mineralization. Gold is found in three different forms: 1) submicrometer-size inclusions of gold in arsenian pyrite, 2) as electrum and 3) in the crystal lattice of sulfides(pyrite, galena and chalcopyrite). Six types of pyrite(Py1-Py6) were identified in this ore reserve. Py3 coexists with arsenopyrite and contains the greatest As-Au concentrations. There is a negative correlation between the As and S contents in Py2 and Py3, implying the substitution of sulfur by arsenic. Pyrites and mineralized quartz veins were formed via metamorphic-hydrothermal fluid and reflect the gold-transportation as Au(HS)_2~- under reducing and acidic conditions. The gold precipitation mainly controlled by crystallization of arsenian pyrite during fluid/rock interactions and variation of fO_2. The volcanic host rock has played an important role in gold concentration, as Py3 in this rock contains inclusion of gold particles, but gold is within the lattice of pyrite in phyllite or other units. 相似文献