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Trace element and REE geochemistry of the Zhewang gold deposit, southeastern Guizhou Province, China 被引量:4
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作者 LIU Kun YANG Ruidong +2 位作者 CHEN Wenyong LIU Rui TAO Ping 《Chinese Journal Of Geochemistry》 EI CAS CSCD 2014年第1期109-118,共10页
The quartz vein-type gold deposits are widely hosted by the Neoproterozoic(Xiajiang Group) epimetamorphic clastic rock series in southeastern Guizhou Province, China. The Zhewang gold deposit studied in this paper occ... The quartz vein-type gold deposits are widely hosted by the Neoproterozoic(Xiajiang Group) epimetamorphic clastic rock series in southeastern Guizhou Province, China. The Zhewang gold deposit studied in this paper occurs in the second lithological member of the Pinglue Formation of the Xiajiang Group. Trace element geochemistry of host rocks, quartz veins and arsenopyrite has revealed that ore-forming fluid was enriched in sulphophile elements such as Au, Ag, As, Sb, Pb and Zn, and simultaneously concentrated some magmaphile elements such as W and Mo, which probably provides some evidence for multi-stage mineralization or overprinting of magmatic hydrotherm. Quartz veins and arsenopyrite were characterized by depletion in HFSE and enrichment in LREE. Hf/Sm, Nb/La and Th/La imply that the ore-forming fluid was probably a NaCl-H2O solution system enriched in more Cl than F; Th/U values reflect the strong reducibility of the ore-forming fluid, coincident with the sulfide assemblages. The values of Co/Ni reflect that magmatic fluids may have partly participated in the ore-forming process and Y/Ho values have proved that the ore-forming fluid was associated with metamorphism and exotic hydrotherm which has reformed former quartz veins during late mineralization. The concentrations of REE, Eu anomalies and Ce anomalies of this deposit display that ore-forming elements mainly were derived from host rocks and possibly from a mixed deep source, and the ore-forming fluid was mixed by dominant metamorphic fluid and minor other sources. The physical-chemical conditions of ore-forming fluid changed from the initial stage to the late stage. The metamorphic fluid is responsible for the mineralization. Therefore, the Zhewang gold deposit is classified as a quartz vein-type gold deposit which may have been reformed by magmatic fluids during the late stage. 展开更多
关键词 石英脉型金矿床 微量元素地球化学 稀土元素地球化学 黔东南 中国 成矿流体 岩浆流体 物理化学条件
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Determination of Trace Elements in High Purity Gold by High Resolution Inductively Coupled Plasma Mass Spectrometry 被引量:1
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作者 谢华林 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第4期608-612,共5页
Trace elements were determined in high purity gold by high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS). Sample were decomposed by aqua regia. To overcome some potentially problematic spectra/... Trace elements were determined in high purity gold by high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS). Sample were decomposed by aqua regia. To overcome some potentially problematic spectra/ interference, measurements were acquired in both medium and high resolution modes. The matrix effects due to the presence of excessive HCl and Au were evaluated. The optimum conditions for the determination was tested and discussed. The standard addition method was employed for quantitative analysis. The detection limits range from 0.01ug/g to 0.28ug/g depending on the elements. The method is accurate, quick and convenient. It has been applied to the determination of trace elements in high purity gold with satisfactory results. 展开更多
关键词 high purity gold trace elements high resolution inductively coupled plasma mass spectrometry spectral interferences
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Characterization of Galena and Vein Paragenesis in the Penjom Gold Mine,Malaysia:Trace Elements,Lead Isotope Study and Relationship to Gold Mineralization Episodes 被引量:1
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作者 Zakaria ENDUT NG Tham Fatt +2 位作者 Jasmi Hafiz ABDUL AZIZ Sebastien MEFFRE Charles MAKOUNDI 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第6期1914-1925,共12页
The Penjom Gold Mine is located 30 km from the Bentong-Raub Suture at the western boundary of the Central Belt in Peninsular Malaysia. Gold mineralization hosted within the vein system is associated with pyrite, arsen... The Penjom Gold Mine is located 30 km from the Bentong-Raub Suture at the western boundary of the Central Belt in Peninsular Malaysia. Gold mineralization hosted within the vein system is associated with pyrite, arsenopyrite, and minor base metals including galena. Trace element and lead isotope analysis was undertaken on nine samples that represent two stages of galena formed during two tectonic events. Both the Pb isotopes and the trace elements show that the first stage galena within the mineralized areas at the footwall has different geochemical characteristics compared with galena in non mineralized areas in the hanging wall, suggesting that galena crystallized from two different ore fluids and probably at two different times. Higher Te, Se and Bi in the galena from the mineralized area may indicate hydrothermal fluids that migrate through the structural conduit and leached out the metal along the pathway that consist of dominant carbonaceous unit. The Pb isotopic ratio composition are transitional between the bulk crustal growth and an upper crustal growth curve, indicating that derivation was from arc rocks associated with continental crust or a crustal source that includes arc volcanic and old continental sedimentary rocks. 展开更多
关键词 Vein paragenesis GALENA trace elements lead isotope and gold mineralization
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The Application of Scanning Proton Microprobe (SPMP) in Study of Trace Gold Distribution
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作者 魏元柏 陈武 +3 位作者 周建平 朱节清 谷英梅 陆荣荣 《Chinese Science Bulletin》 SCIE EI CAS 1994年第2期146-148,共3页
Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually... Studies on distribution of trace gold mostly focus on some samples in whichgold content is well above 100 ppm at the present time due to the limitation of analy-sis methods. Progress in research on trace gold (usually less than 100 ppm to n ppm)was rarely reported. Although electronic microprobe (EMP) and scanning electronicmicroprobe (SEM) have a high resolution, their detection limits are still 100-500ppm and 100-300 ppm, respectively. And also the electronic paramagnetic reso-nance spectrometer, an effective method for determining lattice gold of a few tenppm level, unfortunately is still incapable of doing such research. Newly 展开更多
关键词 trace gold DISTRIBUTION of gold SCANNING PROTON microprobe.
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Trace element and REE geochemistry of Sanshenjiang gold deposit, southeastern Guizhou Province, China 被引量:4
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作者 LIU Kun YANG Ruidong +2 位作者 CHEN Wenyong LIU Rui TAO Ping 《Chinese Journal Of Geochemistry》 EI CAS CSCD 2013年第2期212-221,共10页
The Sanshenjiang gold deposit in southeastern Guizhou Province, China, is hosted by the Neoproterozoic metasedimentary rocks which experienced low-grade greenschist facies metamorphism. Gold mineralization occurs main... The Sanshenjiang gold deposit in southeastern Guizhou Province, China, is hosted by the Neoproterozoic metasedimentary rocks which experienced low-grade greenschist facies metamorphism. Gold mineralization occurs mainly in the ribbon chiltern slate of the first member of the Longli Formation and is controlled by both strata and faults. Ore bodies are characterized by abundant quartz-arsenopyrite-gold-pyrite-bedding veins, veinlets and small lenses within the shear zone. In this study, trace element and REE geochemistry was analyzed to constrain the origin and genesis of this deposit. The trace element signatures of wall rocks and veins display a basically similar tendency in the spider diagram, showing the genetic relationship. The values of Co/Ni, Y/Ho, Hf/Sm, Nb/La and Th/La reflect that the hydrothermal fluids of this deposit were derived from the mixture of multiple sources with marked enrichment of Cl and moderate to high temperature. There is a broad similarity in the chondrite-normalized patterns and REE fractionation between wall rocks and ore bodies, possibly reflecting their similar origin. Based on the difference in δCe and δEu, quartz veins and lenses can be subdivided into weakly negative Ce-anomalies (δCe=0.81 to 1.06) with slight Eu anomalies (δEu=0.81 to 1.06) type and the significant positive Ce-anomalies (δCe=1.13 to 1.97) with moderate negative Eu-anomalies type, probably suggesting physical-chemical changes in the evolution process of ore-forming fluids from the early to late stage. It can be concluded that the ore-forming process may have experienced three stages: formation of the original ore source bed, regional metamorphism and gold mineralization, on the basis of trace element and REE analysis and field observation. 展开更多
关键词 稀土元素地球化学特征 微量元素 金矿化 东南部 贵州省 中国 异常类型 物理化学变化
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Rare Earth Element and Trace Element Features of Gold-bearing Pyrite in the Jinshan Gold Deposit,Jiangxi Province 被引量:6
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作者 MAO Guangzhou HUA Renmin +4 位作者 GAO Jianfeng ZHAO Kuidong LONG Guangming LU Huijuan YAO Junming 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2010年第3期614-623,共10页
Jinshan gold deposit is located in northeastern Jiangxi,South China,which is related to the ductile shear zone.It has a gold reserve of more than 200 tons,with 80%of gold occurring in pyrite. The LREE of gold-bearing ... Jinshan gold deposit is located in northeastern Jiangxi,South China,which is related to the ductile shear zone.It has a gold reserve of more than 200 tons,with 80%of gold occurring in pyrite. The LREE of gold-bearing pyrite is as higher as 171.664 ppm on average,with relatively higher light rare earth elements(LREE;159.556 ppm) and lower HREE(12.108 ppm).TheΣLREE/ΣHREE ratio is 12.612 and(La/Yb)_N is 11.765.These indicate that pyrite is rich in LREE.The(La/Sm)_N ratio is 3.758 and that of(Gd/Yb)_N is 1.695.These are obvious LREE fractionations.The rare earth element(REE) distribution patterns show obvious Eu anomaly with averageδEu values of 0.664,andδCe anomalies of 1.044.REE characteristics are similar to those of wall rocks(regional metamorphic rocks),but different from those of the Dexing granodiorite porphyry and Damaoshan biotite granite.These features indicate that the ore-forming materials in the Jinshan gold deposit derived from the wall rocks, and the ore-forming fluids derived from metamorphic water.The Co/Ni ratio(average value 0.38) of pyrite suggests that the Jinshan gold deposit formed under a medium-low temperature.It is inferred from the values of high-field strength elements,LREE,Hf/Sm,Nb/La,and Th/La of the pyrite that the ore-forming fluids of the Jinshan gold deposit derived from metamorphic water with Cl〉F. 展开更多
关键词 rare earth element trace element PYRITE ore-forming fluid GEOCHEMISTRY Jinshan gold deposit
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Trace Elements in Fluid Inclusions in the Carlin-Type Gold Deposits, Southwestern Guizhou Province
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作者 苏文超 胡瑞忠 +1 位作者 漆亮 方维萱 《Chinese Journal Of Geochemistry》 EI CAS 2001年第3期233-239,共7页
Fluid inclusions in quartz from the Lannigou and Yata Carlin\|type gold deposits in southwestern Guizhou were analyzed by inductively coupled plasma\|mass spectrometry for their trace elements (Co, Ni, Cu, Pb, Zn, Pt,... Fluid inclusions in quartz from the Lannigou and Yata Carlin\|type gold deposits in southwestern Guizhou were analyzed by inductively coupled plasma\|mass spectrometry for their trace elements (Co, Ni, Cu, Pb, Zn, Pt, etc.). The results show that quartz fluid inclusions entrapped at different ore\|forming stages contain higher Co, Ni, Cu, Pb and Zn. It has been found for the first time that the ore\|forming fluids responsible for the Carlin\|type gold deposits are rich in Pt. From this it can be concluded that basic volcanic rocks seem to be one of the important sources of ore\|forming materials for the Carlin\|type gold deposits. 展开更多
关键词 示踪元素 ICP-MS 金矿床 贵州 成矿流体
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Assessing the Impact of Gold Mining on the Quality of Water Resources in the Commune of Meguet, Burkina Faso
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作者 Issoufou Ouedraogo Samuel Lankoande +3 位作者 Yacouba Konate Boukary Sawadogo Nicolas Kagambega Martin Lompo 《Journal of Water Resource and Protection》 CAS 2024年第4期281-292,共12页
Despite its often illegal nature, artisanal gold mining in Burkina Faso contributes to the economic and social development of the country. However, the rudimentary techniques used in gold panning have a significant im... Despite its often illegal nature, artisanal gold mining in Burkina Faso contributes to the economic and social development of the country. However, the rudimentary techniques used in gold panning have a significant impact on the environment due to inappropriate practices and the use of various chemical substances. This study aims to assess the impact of artisanal gold mining on the quality of water resources in a rural community at Méguet, Burkina Faso. To this end, surface and groundwater samples were collected and analyzed at the BUMIGEB laboratory. Field results show that the waters are slightly alkaline (6.97 < pH < 8.1), weakly mineralized and conductive (124 < EC < 543 μS/cm), with temperatures ranging from 24.6˚C to 31.6˚C. In addition, trace metals (TMEs) analyzed from surface and subsurface waters show very high levels, generally deviating from the levels recommended by WHO guidelines for Burkina Faso. Trace metals contamination of water resources in the commune of Méguet is mainly due to Fe (3.78 - 11.12 mg/kg), Hg (0.03 - 0.29 mg/kg), As (0.01- 6.31 mg/kg) and Pb (0.01 - 3.8 mg/kg). This study can serve as a basis for guiding national environmental policies to protect the water resources of the Méguet mine. 展开更多
关键词 gold Panning Water Quality trace Metal Méguet Burkina Faso
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Isotope Tracing and Prospecting Assessment of Gold-Silver Deposits in Zhejiang Province 被引量:1
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作者 Chen Haoshou and Xu Butai Department of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang Zhejiang Institute of Geology and Mineral Resources, Hangzhou, Zhejiang Liu Xinzhu 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1997年第3期293-304,共12页
Three different types of gold and silver deposits in Zhejiang Province(Huangshan gold deposit, Zhilingtou gold-silver deposit and Haoshi silver deposit) showmarked differences in lead and strontium isotopic compositio... Three different types of gold and silver deposits in Zhejiang Province(Huangshan gold deposit, Zhilingtou gold-silver deposit and Haoshi silver deposit) showmarked differences in lead and strontium isotopic composition, suggesting three differentsources and geneses of these deposits. The Huangshan gold deposit features low initial Srisotope ratios and low μ values or low content of radiogenic Pb and its ore-forming materialscame primarily from the upper mantle; the Zhilingtou gold-silver deposit shows high initial Srisotope ratios and high μ values or high content of radiogenic Pb and the ore-forming materialswere derived mainly from the upper crust; and the Haoshi silver deposit has its Pb and Srisotope ratios between the above two cases with the ore-forming materials stemming from boththe mantle and the crust. The characteristic Pb isotopic composition may serve as an indicatorfor prospecting for different types of ore deposits. 展开更多
关键词 isotope tracing gold deposit silver deposit Zhejiang Province
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Source Strata of Gold in Western Guangdong— Their Identification and Significance in Gold Mineralization
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作者 陆建军 吴劲薇 翟建平 《Chinese Journal Of Geochemistry》 EI CAS 1995年第4期336-345,共10页
Strata of different geological periods extensively outcrop in western Guang-dong Province, but most gold deposits are restricted to the Middle-Late Proterozoic Yunkai Group and the Cambrian Bacun Group,showing obvious... Strata of different geological periods extensively outcrop in western Guang-dong Province, but most gold deposits are restricted to the Middle-Late Proterozoic Yunkai Group and the Cambrian Bacun Group,showing obvious strata-boun character-istics .Gold abundance and trace element geochemistry of the Yunkai and Bacun Groups are compared with those of the Ordovician and Silurian strta.The Yunkai Group is considered to be the source strata for gold mineralization in the region. 展开更多
关键词 地层 云开组 广东 示踪元素 寒武纪 志留纪 成矿作用 富集
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Neurological function following intra-neural injection of fluorescent neuronal tracers in rats 被引量:3
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作者 Wen Hu Dan Liu +4 位作者 Yanping Zhang Zhongyi Shen Tianwen Gu Xiaosong Gu Jianhui Gu 《Neural Regeneration Research》 SCIE CAS CSCD 2013年第14期1253-1261,共9页
Fluorescent neuronal tracers should not be toxic to the nervous system when used in long-term labeling. Previous studies have addressed tracer toxicity, but whether tracers injected into an intact nerve result in func... Fluorescent neuronal tracers should not be toxic to the nervous system when used in long-term labeling. Previous studies have addressed tracer toxicity, but whether tracers injected into an intact nerve result in functional impairment remains to be elucidated. In the present study, we examined the functions of motor, sensory and autonomic nerves following the application of 5% Fluoro-Gold, 4% True Blue and 10% Fluoro-Ruby (5 pL) to rat tibial nerves via pressure injection. A set of evaluation methods including walking track analysis, plantar test and laser Doppler perfusion imaging was used to determine the action of the fluorescent neuronal tracers. Additionally, nerve pathology and ratio of muscle wet weight were also observed. Results showed that injection of Fluoro-Gold significantly resulted in loss of motor nerve function, lower plantar sensibility, increasing blood flow volume and higher neurogenic vasodilatation. Myelinated nerve fiber degeneration, unclear boundaries in nerve fibers and high retrograde labeling efficacy were observed in the Fluoro-Gold group. The True Blue group also showed obvious neurogenic vasodilatation, but less severe loss of motor function and degeneration, and fewer labeled motor neurons were found compared with the Fluoro-Gold group. No anomalies of motor and sensory nerve function and no myelinated nerve fiber degeneration were observed in the Fluoro-Ruby group. Experimental findings indicate that Fluoro-Gold tracing could lead to significant functional impairment of motor, sensory and autonomic nerves, while functional impairment was less severe following True Blue tracing. Fluoro-Ruby injection appears to have no effect on neurological function. 展开更多
关键词 neural regeneration peripheral nerve injury neuronal tracing tracer toxicity neurological function FLUORO-gold True Blue Fluoro-Ruby grants-supported paper NEUROREGENERATION
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Silicon Isotope Geochemistry of Micro-Fine Disseminated Gold Deposits in SW Guizhou and NW Guangxi,China 被引量:1
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作者 刘显凡 倪师军 +2 位作者 卢秋霞 金景福 朱赖民 《Chinese Journal Of Geochemistry》 EI CAS 1998年第3期249-257,共9页
Quartz was studied with respect to its silicon isotopic composition and cathodoluminescence in micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi. The resultsshowed that quartz in wall rocks, ores and ... Quartz was studied with respect to its silicon isotopic composition and cathodoluminescence in micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi. The resultsshowed that quartz in wall rocks, ores and that in association with hydrothermal silicificationare distinctive in silicon isotopes and cathodoluminescence characters. Quartz in association withprimary silicification is non-luminescent while that in wall rocks and associated with secondarysilicification exhibits striking luminescence. Based on the dynamic fractionation of silicon isotopes, it is suggested that the mineralization was accompanied by rapid transport of a primarysiliceous fluid along the major deep fault system into subordinate faults before ore componentsdeposited in favorable strata via penetration and metasomatism. Therefore, a deep origin is implicit for gold deposits of this type. 展开更多
关键词 硅同位素 阴极射线磷光 同位素示踪 中国 广西 贵州 金矿床 成矿作用
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Preparation and Characterization of Gold Thin Film Electrode Modified by Microbe
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作者 Jin Kun FU Rong Zong HU +2 位作者 Wei De ZHANG Xin Sheng YU Jin Yin FU(State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第4期311-312,共2页
A novel method based on microbe modification has been employed to prepare gold thin film electrode. The preparation method is simple and the electrode obtained is stable and very sensitive in determining heavy metal i... A novel method based on microbe modification has been employed to prepare gold thin film electrode. The preparation method is simple and the electrode obtained is stable and very sensitive in determining heavy metal ions. The quantitation limit of Cu2+ is 0.05 ng/mL. 展开更多
关键词 gold thin film electrode microbe modification trace analysis
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Influence of Copper and Arsenic on Gold Recovery in the Yalea Deposit, Western Mali
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作者 Fodé Tounkara Jianguo Chen +1 位作者 Mory Sidibe Oumar Soumare 《Open Journal of Geology》 2021年第4期142-154,共13页
Gold recovery process is well known. The following paper presents the problematic related to the influence of Copper and Arsenic on the recovery of gold in the Yalea deposit. Multielement tests (Au, Cu, As) carried ou... Gold recovery process is well known. The following paper presents the problematic related to the influence of Copper and Arsenic on the recovery of gold in the Yalea deposit. Multielement tests (Au, Cu, As) carried out on 37 blocks made it possible to understand that there is a correlation between these elements. This correlation has been observed since the analysis of block models (the block model for Copper, block model for Arsenic and the block model for gold. These models have shown that the Yalea deposit areas with a high gold content correspond to areas of high copper content and arsenic. Those who made it clear that copper and Arsenic are tracing elements of Gold in the Yalea deposit. In this paper, the mineralurgical tests carried out on 28 blocks revealed that the copper and the arsenic content in the ore penalize the recovery of Gold (146 ppm for copper and 4710 ppm for Arsenic). The Yalea deposit was emplaced by several hydrothermal phases that reactivated the structures. These phases are responsible for the establishment of large quantities of copper sulphides. Copper and Arsenic are elements that have a considerable influence on the gold recovery in the Yalea deposit. 展开更多
关键词 gold Recovery Yalea Deposit Mineralurgical Tests Tracing Elements
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Geochemical Tracing of Ore-forming Material Sources of Carlin-type Gold Deposits in the Yunnan-Guizhou-Guangxi Triangle Area --A Case Study of the Application of the Combined Silicon Isotopes Geochemistry and Siliceous Cathodoluminescence Analysis 被引量:1
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作者 LIU Xianfan NI Shijun +2 位作者 LU Qiuxia JIN Jingfu ZHU Laimin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1999年第1期30-39,共10页
Abstract This paper deals with characteristics of silicon isotope compositions and siliceous cathodoluminescence of host rocks, ores and hydrothermal silicified quartz of the Carlin-type ore deposits in the Yunnan-Gui... Abstract This paper deals with characteristics of silicon isotope compositions and siliceous cathodoluminescence of host rocks, ores and hydrothermal silicified quartz of the Carlin-type ore deposits in the Yunnan-Guizhou-Guangxi triangle area. The study shows that primary silicified quartz is nonluminescent but quartz in host rocks and secondary silicified quartz are luminescent by the action of cathode rays. Correspondingly, silicon isotope compositions of host rocks, ores and hydro6thermal quartz veins are clearly distinguished. In strata from the Middle Triassic to the “Dachang” host bed, δ30Si of the host rocks ranges from 0.0% ?0.3%, while that of primary ore-forming silicified fluids from ?0.1% to ?0.4%; in the Upper Permian and Lower Carboniferous strata and Indosinian diabase host beds, δ30Si of the host rocks is from ?0.1% to ?0.2% and that of the primary silicified quartz veins from 0.3 % ?0.5 %. This pattern demonstrates the following geochemical mineralization process, primary ore-forming siliceous fluids migrated upwards quickly along the main passages of deep-seated faults from mantle to crust and entered secondary faults where gold deposits were eventually formed as a result of permeation and replacement of the siliceous ore-forming fluids into different ore-bearing strata. This gives important evidence for the fact that ore-forming fluids of this type of gold deposits were mainly derived from upper mantle differentiation and shows good prospects for deep gold deposits and geochemical background for large and superlarge gold deposits. 展开更多
关键词 silicon isotope siliceous cathodoluminescence tracing of ore-forming material source Carlin-type gold deposit Yunnan-Guizhou-Guangxi triangle area
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右江盆地金、锑成矿过程:来自晴隆锑矿床和泥堡金矿床萤石LA-ICP-MS微量元素研究的制约 被引量:1
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作者 刘林林 陈军 +7 位作者 杜丽娟 杨瑞东 黄智龙 杨再风 高军波 吉彦冰 谭泽东 刘旭阳 《矿物学报》 CAS CSCD 北大核心 2024年第3期399-419,共21页
位于“滇-黔-桂”接壤处的右江盆地中发育大量的金、锑矿床,金、锑相互伴生,具共生分异特征。然而,金、锑之间的成矿联系和成矿过程异同仍需要进一步的研究工作。萤石作为热液矿床中广泛出现的脉石矿物,前人已经对其开展了大量的研究用... 位于“滇-黔-桂”接壤处的右江盆地中发育大量的金、锑矿床,金、锑相互伴生,具共生分异特征。然而,金、锑之间的成矿联系和成矿过程异同仍需要进一步的研究工作。萤石作为热液矿床中广泛出现的脉石矿物,前人已经对其开展了大量的研究用于揭示矿床的形成过程。右江盆地中的晴隆锑矿床和泥堡金矿床具有相似的成矿时代以及围岩蚀变特征,是研究金、锑共生分异的理想对象。因此,本文选择晴隆锑矿床和泥堡金矿床中与成矿相关的萤石展开原位LA-ICP-MS微量元素研究,旨在揭示金、锑矿床成矿过程的差异。萤石矿物化学及阴极发光(CL)研究显示,晴隆锑矿床中与成矿相关的萤石沉淀可以划分为三个阶段,第一阶段稀土元素呈LREE富集HREE亏损的右倾特征,第二阶段呈“中稀土(MREE)”富集,第三阶段沉淀的萤石基本继承了第二阶段的稀土元素的配分特征,但ΣREE更低。整体上,随着成矿过程进行,三个阶段萤石ΣREE随着成矿过程逐渐下降,且均伴随Ce的负异常。泥堡金矿床中与成矿相关的萤石沉淀可以划分为两个阶段,第一阶段萤石稀土元素也呈右倾特征,第二阶段萤石呈MREE富集特征,整体上与晴隆萤石大致相似。不同阶段萤石Y/Ho、La/Ho、Tb/Ca和Tb/La图解显示,锑、金矿床中成矿早阶段和晚阶段萤石具有不同成因特征。其中,成矿早阶段萤石主要为热液充填成因,成矿晚阶段与水/岩反应密切相关,随着水/岩反应加剧,大量围岩组分进入流体形成晚阶段萤石。同时,这一过程导致成矿流体pH的逐渐升高和稀土元素总量的逐渐降低。综合分析认为,锑成矿流体为酸性流体,强烈的水/岩反应促使碳酸盐岩围岩溶解形成大量的萤石;同时成矿环境p H的增高和成矿流体温度的降低可能是导致辉锑矿大量沉淀的原因之一;而金成矿流体呈弱酸-中性特征,去碳酸岩化作用不彻底,形成少量萤石并伴生大量白云石,有利于大量含金黄铁矿的形成。通过对已有的锑矿床中辉锑矿及成矿阶段脉石矿物稀土元素研究数据统计发现,成矿阶段脉石矿物稀土元素呈MREE富集特征可能是大量辉锑矿对轻稀土元素(La)的富集作用所导致的。 展开更多
关键词 LA-ICP-MS 微量元素 萤石 金-锑矿床 右江盆地
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Evaluation of Pollution Due to Gold Mining at Ity-Floleu Area in Sub-Prefecture of Zouan-Hounien, Western Côte d’Ivoire
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作者 Gbamélé Kouassi Serge Konan Kouakou Séraphin +3 位作者 Kouassi Kouakou Lazare Brou Loukou Alexis Konan Koffi Félix Bini Kouamé Dongui 《Journal of Geoscience and Environment Protection》 2019年第12期20-41,共22页
This study aims to evaluate the mineral pollution of a gold mining environment in the sub-Prefecture of Zouan-Hounien (C?;te d’Ivoire). Samples were taken from surface water and flesh and skin samples of the Cavally ... This study aims to evaluate the mineral pollution of a gold mining environment in the sub-Prefecture of Zouan-Hounien (C?;te d’Ivoire). Samples were taken from surface water and flesh and skin samples of the Cavally River fish species over a period of two successive years. Concentrations in major elements, trace elements (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn), nutrients () and physico-chemical parameters in situ were measured. The results obtained show that the surface waters have very low pH with an average of 5.70. For nutrient salts, the deterioration of water quality in the study area is mainly related to alterations by nitrates, phosphates and sulphates. The concentrations of Fe, Cu, Hg and Pb are above the existing standards (international, FAO/WHO) for the majority of the stations, thus causing the deterioration of the surface water quality. Therefore, their use for agricultural irrigation could have negative impact on the health of the population and on biodiversity. Regarding the bioindicating species, the results obtained after analysis of samples showed that the fish (carp and machoiron) have Fe, Cu, Hg and Pb concentrations higher than the existing standards (international, FAO/WHO) exposing consumers to high health risks. This study showed good correlation between the high values of surface water turbidity and the proximity of gold washing sites. The use of the principal component analysis (PCA) of the physicochemical dataset revealed comparable behaviors for certain minerals within the groups (Fe, K, Mg, Mn and Na) and (As, Cd, Cu, Ni, Pb, Zn and Ca) in water. The Ascending Hierarchical Classification (AHC) analysis has defined three different classes of surface water in the study area. The presence of mineral trace elements in these receiving environments is of natural origin but would be strongly accentuated by human activities. 展开更多
关键词 Cavally River FISH gold Mining Major ELEMENTS NUTRITIOUS SALTS Surface Water trace ELEMENTS
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滇东南茶花寨金矿床载金黄铁矿LA-ICPMS原位微量元素组成与地质意义
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作者 陈威鸿 刘玉平 +3 位作者 杨昌毕 叶霖 刘仕玉 苏文超 《矿物学报》 CAS CSCD 北大核心 2024年第1期122-132,共11页
右江盆地是世界上卡林型金矿床最集中的地区之一,盆地南缘的滇东南地区是其重要组成部分。茶花寨金矿床为滇东南地区产于印支运动不整合面附近的代表性金矿床,黄铁矿为主要的载金矿物,其环带特征明显,为认识该区卡林型金矿成矿作用提供... 右江盆地是世界上卡林型金矿床最集中的地区之一,盆地南缘的滇东南地区是其重要组成部分。茶花寨金矿床为滇东南地区产于印支运动不整合面附近的代表性金矿床,黄铁矿为主要的载金矿物,其环带特征明显,为认识该区卡林型金矿成矿作用提供了理想的实例。本文在野外考察及镜下观察的基础上,通过LA-ICPMS分析技术,对茶花寨金矿床中不同期次黄铁矿开展了原位微量元素组成分析,以总结不同成矿阶段金的富集特征与关键控制因素。研究结果表明,该矿床黄铁矿存在3个期次:沉积成因的Py1,包括草莓状黄铁矿Py1a和环带状黄铁矿核部Py1b,交代成因的中间环带Py2,热液成因最外侧环带Py3。其中,Py1b富集Sb、Pb、Zn等元素,Py2富集As、Co、Ni,Py3则具有较高的Au、As、Cu、Sb含量和稍高的Se、Hg、Tl含量。三者对比显示,Py2中As含量最高,Py1b和Py2除As以外的其他微量元素含量接近或Py2中含量稍低,二者Co/Ni比值均在0.1附近,表明Py2为Py1b受热液交代改造形成;而Py3中微量元素组成与Py1b和Py2差异明显,指示其热液成因,且Py3中Co、Ni含量相较Py1b和Py2更低,Co/Ni比值在0.01~0.1之间,表明成矿流体温度较低且不富集Co、Ni,Py3中Co、Ni主要继承自Py1b和Py2。该矿床Au主要以晶格金的形式赋存在Py3中,其进入黄铁矿晶格与As、Sb、Cu、Se等元素相关。综上所述,茶花寨金矿床成矿流体为富集Au、As、Cu、Sb、Se、Tl等元素的低温热液流体,在到达赋矿地层后,交代Py1b形成高砷的中间环带Py2,流体中Au受高砷的Py2吸附聚集,在Py3形成过程中沉淀下来,最终以固溶体的形式赋存其中。 展开更多
关键词 黄铁矿 LA-ICPMS 微量元素 茶花寨金矿床 滇东南
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四川康定偏岩子造山型金矿床成因:石英微量元素和硫化物S同位素证据
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作者 宋明伟 彭义伟 +7 位作者 陈友良 刘畅 田建吉 赵鹤森 王琦 王智 周钰昌 吴锋 《成都理工大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第4期596-613,共18页
大渡河金矿带是中国重要的金矿化富集区,发育一系列造山型金矿床。偏岩子金矿床位于大渡河南段的康定地区,矿体赋存于震旦系灯影组白云岩中。金成矿过程分为金-黄铁矿-石英阶段、金-氟镁石阶段、金-硫化物-氟镁石-石英阶段和黄铁矿-白云... 大渡河金矿带是中国重要的金矿化富集区,发育一系列造山型金矿床。偏岩子金矿床位于大渡河南段的康定地区,矿体赋存于震旦系灯影组白云岩中。金成矿过程分为金-黄铁矿-石英阶段、金-氟镁石阶段、金-硫化物-氟镁石-石英阶段和黄铁矿-白云石-白云母阶段4个成矿阶段。通过石英中微量元素和硫化物S同位素的原位分析,旨在约束成矿流体性质、成矿物质来源和矿床成因。石英中Li,B,Na,Al,P和K相对富集,主要以Al^(3+)^(+)(Li^(+),Na^(+),K^(+),H^(+))Si^(4+)和Al^(3+)^(+)P 5^(+)2Si^(4+)的替换机制进入石英晶格。石英中Al与Li呈明显正相关关系,指示其形成温度较低。围岩中硫化物的δ^(34) S值介于-22.3‰~-13.1‰之间,表明S来源于海相硫酸盐的细菌还原作用;矿石中硫化物的δ^(34) S值范围为5.4‰~7.0‰,与交代岩石圈地幔的硫同位素值一致。综合矿床地质特征、石英微量元素和硫化物硫同位素组成,研究认为偏岩子属于造山型金矿床。成矿流体在上升过程中与赋矿白云岩接触,发生水-岩反应,导致自然金、含金硫化物、氟镁石和萤石的沉淀结晶。 展开更多
关键词 氟镁石 石英微量元素 原位S同位素 造山型金矿床 偏岩子
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塞尔维亚Čukaru Peki铜金矿床的热液绿帘石类型和成分及其找矿意义
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作者 陈安顺 单思齐 +6 位作者 谢桂青 刘文元 张安顺 毛景文 饶东平 陈思源 黄伟山 《矿床地质》 CAS CSCD 北大核心 2024年第4期918-934,共17页
Čukaru Peki铜金矿床位于特提斯成矿域西部塞尔维亚Timok矿集区,是近几年新发现的超大型斑岩-浅成低温热液型铜金矿床。该矿床主要产于晚白垩世角闪斜长安山岩中,具有明显的蚀变分带特征,是研究蚀变矿物勘查指标体系的理想对象。笔者结... Čukaru Peki铜金矿床位于特提斯成矿域西部塞尔维亚Timok矿集区,是近几年新发现的超大型斑岩-浅成低温热液型铜金矿床。该矿床主要产于晚白垩世角闪斜长安山岩中,具有明显的蚀变分带特征,是研究蚀变矿物勘查指标体系的理想对象。笔者结合钻孔编录信息,利用显微镜、电子探针和LA-ICP-MS分析技术,对该矿床中的绿帘石进行矿物化学成分分析。根据产状可将绿帘石划分为2类,分别为赋存于绢英岩化带中的绿帘石(Ⅰ型绿帘石)和赋存于青磐岩化带中的绿帘石(Ⅱ型绿帘石)。电子探针分析结果表明,2类绿帘石中的n(Al)与n(Fe)、n(Ca)与n(Mn)均呈现负相关关系,n(Al)、n(Fe)、w(Mn)存在明显的差异,Ⅰ型绿帘石贫Fe、Mn,富Al元素,具有相对较低的X_(Fe)值,Ⅱ型绿帘石与之相反,富Fe、Mn,贫Al元素,具有相对较高的X_(Fe)值。结合矿相学特征,文章提出Ⅰ型绿帘石由斜长石蚀变而成,Ⅱ型绿帘石由角闪石蚀变而成,暗示绿帘石的主量元素变化受蚀变前的矿物控制。LA-ICP-MS分析测试结果表明,青磐岩化带中由深部至浅部Ⅱ型绿帘石的w(Pb)、w(Sb)、w(Ba)显示升高的趋势,浅部绿帘石具有较低的w(Mo);Ⅱ型绿帘石中的w(Mn)、n(Al)和w(Mg)随着深度的增加呈现出先升高后降低的变化趋势,w(As)、n(Fe)和n(Ca)呈现出相反的空间变化趋势。由于绿帘石的微量元素找矿指标变化受温度等物理化学条件的影响,根据Čukaru Peki铜金矿床绿帘石中的w(Mg)、w(Pb)、w(Sb)、w(Ba)、w(Mo)、w(Mn)、w(As)的空间变化规律,笔者推测该斑岩型矿床热液中心在Mn元素晕之下1~2 km处。笔者研究发现Ⅱ型绿帘石中的主量元素n(Al)和X_(Fe)与w(Mn)微量元素呈现类似的变化趋势,n(Ca)和n(Fe)与w(Mn)呈现相反的变化趋势,故Ⅱ型绿帘石中的n(Al)、X_(Fe)、n(Ca)和n(Fe)元素可以作为找矿勘查的新指标。 展开更多
关键词 绿帘石 主、微量元素 斑岩铜金矿床 找矿勘查 Čukaru Peki铜金矿床
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