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1.
山东省平度市大庄子金矿区黄铁矿、方铅矿与金的共生关系研究 总被引：1，自引：0，他引：1
通过对山东省平度市大庄子金矿区黄铁矿、方铅矿三个蚀变阶段特征研究,发现金矿化主要发生在第二阶段,强烈的石英-黄铁矿-碳酸盐化与金矿化的关系最为密切。金多数以包体的形式赋存于黄铁矿等金属硫化物中,并且在黄铁矿、方铅矿、闪锌矿等矿物共同产出时更有利于金的富集。研究认为石英和黄铁矿组合以及黄铁矿、黄铜矿、方铅矿、闪锌矿的组合可作为金的富集指示性矿物组合,伴生矿物之中方铅矿含金性最好。方铅矿、黄铜矿、闪锌矿和磁黄铁矿呈细脉状、网脉状、斑杂状产于含金石英脉和团块状黄铁矿的裂隙中,研究发现细脉状较团块状黄铁矿含金性要好。 相似文献
2.
四川会东大梁子铅锌矿床锗富集于方铅矿中的新证据 总被引：5，自引：4，他引：1
由于锗的离子半径与锌的离子半径相近,一般认为铅锌矿床中的锗主要与锌发生类质同像赋存于闪锌矿中,但也有证据表明,铅锌矿床中的锗也可富集于方铅矿中。对四川会东大梁子大型铅锌矿床进行了电子探针研究,锗特征X射线面扫描结果表明:该铅锌矿床原生矿石中方铅矿中的锗含量明显高于闪锌矿中的锗含量,且锗均匀分布在方铅矿中,没有出现明显高于本底的富集点,初步推测锗在方铅矿中以类质同像的形式存在。该结果为铅锌矿床锗富集于方铅矿中提供了新证据。 相似文献
3.
L. F. Simanenko 《Russian Journal of Pacific Geology》2007,1(2):144-152
The localization and chemical composition of the galena from the Partizansky base metal-skarn deposit have been studied in the Second Contact ore body and Bol’nichnaya ore lode. The Partizansky deposit was formed during two stages: base metal-skarn and silver-sulfosalt. Much of the galena was deposited with the productive galena-sphalerite assemblage at the first stage. The galena of the productive stage of the Second Contact body shows wide variations in trace element composition. The galena from the root zone of the ore-bodies (the level of ?135 m) is characterized by steady high contents of economically important isomorphic and mechanical admixtures of bismuth and silver. The galena from the middle levels is almost devoid of isomorphic admixtures and occasionally contains fine inclusions of Ag-tetrahedrite. The high silver (and stibium) contents in the galena from the uppermost horizon (the level of +285 m) are mainly related to mineral inclusions of diverse silver minerals of the late silver-bearing assemblage. The galena from the Bol’nichnaya lode over a large depth interval has elevated contents of isomorphic silver and bismuth, with abundant inclusions of native bismuth. 相似文献
4.
Zakaria ENDUT NG Tham Fatt Jasmi Hafiz ABDUL AZIZ Sebastien MEFFRE Charles MAKOUNDI 《《地质学报》英文版》2015,89(6):1914-1925
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. 相似文献
5.
6.
T. V. Svetlitskaya 《Doklady Earth Sciences》2017,476(1):997-1000
The paper presents data on the chemical composition and mineral association of Pd-bearing galena, discovered in hydrothermal–metasomatic sulfide Cu–Ni ores of the Sedova Zaimka mineralization (Western Siberia). In the Sedova Zaimka mineralization, galena is an accessory mineral and occurs in association with pyrrhotite, pentlandite, chalcopyrite, sphalerite, argentopentlandite, tsumoite, and native bismuth. The Pd contents in galena are 0.5–0.9 wt %. Palladium occurs in galena in the form of isomorphic impurities and is not related to microinclusions of Pd-bearing minerals. 相似文献
7.
Digestion with aqua regia in a Carius tube and separation of Re with anion exchange resin is commonly employed for Re–Os dating of molybdenite and pyrite. However, the recovery of Re is extremely low when this routine anion exchange method is applied to galena, causing difficulty in Re–Os dating of galena. In this study, we investigated the mechanism of Re loss during sample preparation and tested a revised procedure for Re–Os dating of galena and sphalerite. 相似文献
8.
川滇黔地区铅锌矿床中锗的富集规律研究 总被引：5，自引：0，他引：5
利用电感耦合等离子质谱仪（ICP-MS）分析了川滇黔地区7个铅锌矿床（大梁子、天宝山、会泽、富乐、杉树林、青山、牛角塘）的49件闪锌矿和方铅矿单矿物样品中分散元素锗的含量,结果表明锗富集于闪锌矿中,方铅矿中不富集锗。对文献报道的锗富集于方铅矿中的结论和数据进行了分析,指出了这些结论所依据的电子探针分析数据不可信的可能原因：方铅矿中检测出锗可能是分析过程中电子束穿插了其他锗含量较高的矿物所致;闪锌矿中未检测出锗是由于锗的含量相对较低,小于电子探针仪器的检测限所致;本次分析的7个矿床的闪锌矿中锗的平均含量为0.0125%,而电子探针仪器的检测限为0.02%。 相似文献
9.
10.
Oxidation of galena (PbS) to oxysulfates, (PbO·PbSO4, 3PbO·PbSO4 and 4PbO·PbSO4), has been observed using Raman spectroscopy. Peaks associated with the oxidation products have been assigned. The reaction appears to be a high temperature oxidation induced by the high laser (25 mW at 514.5 nm) power density at freshly cleaved galena surfaces. Damage to the galena surface was observed visually under the microscope. Moderate laser powers (5 mW at 514.5 nm) did not result in any damage. No Raman bands were observed or expected for freshly cleaved galena because it has the rock salt structure. Laser-induced production of these oxysulfates is dramatically different from high temperature methods previously employed. This procedure will permit easy identification of galena in complex mineral ore samples. Spontaneous air oxidation of freshly cleaved galena to oxides or polysulfides was not detected. 相似文献
11.
Gold deposits at El Sid are confined to hydrothermal quartz veins which contain pyrite, arsenopyrite, sphalerite and galena. These veins occur at the contact between granite and serpentinite and extend into the serpentinite through a thick zone of graphite schist. Gold occurs in the mineralized zone either as free gold in quartz gangue or dissolved in the sulfide minerals. Ore-microscopic study revealed that Au-bearing sulfides were deposited in two successive stages with early pyrite and arsenopyrite followed by sphalerite and galena. Gold was deposited during both stages, largely intergrown with sphalerite and filling microfractures in pyrite and arsenopyrite.Spectrochemical analyses of separated pyrite, arsenopyrite, sphalerite and galena showed that these sulfides have similar average Au contents. Pyrite is relatively depleted in Ag and Te. This suggests that native gold was deposited in the early stage of mineralization. Arsenopyrite and galena show relatively high concentrations of Te. They are also respectively rich in Au and Ag. Tellurides are, thus, expected to be deposited together with arsenopyrite and galena. 相似文献
12.
李锡林 《中国地球化学学报》1990,9(4):378-384
Bismuthoan galena is a variety of galena, resulting from the replacement of Bi for some Pb in galena.This mineral occurs in the No.11 orebody of the Lamo skarn-type Zn-Cu deposit in the Dachang ore field ,but only the No,11 orebody of the Lamo deposit is developed such bismuthoan galena.This is closely related to such a geochemical background that the No.11 orebody contains high Bi and Bi-sulfosalt minerals are well developed there.Eight electron microprobe analyses of five samples give 60.17-70.20%Pb(66.94% on average),10.00-16.06%Bi (12.47%),4.83-8.97%Ag(6.39%)and 13.25-13.98% S(13.65%).Its molecular formula is Pb0.76,Bi0.14,Ag0.13,1.03S.No galena so high in Bi has been reported in the literature and this is the first report in China. 相似文献
13.
Sulfide and sulfate ore samples collected from the Hakurei deposit of the Bayonnaise knoll were examined for the occurrence and chemical composition of minerals, including the sulfur isotopes and the microthermometry of fluid inclusions. Massive sulfide ore, mineralized volcanic rock, and anhydrite ore occur in descending order, from the seafloor to the bottom of the cored sample. The massive sulfide ore is dominated by sphalerite and accompanied by tennantite, chalcopyrite, and pyrite with lesser amounts of galena, enargite, and covellite. Amorphous silica is commonly precipitated on the surface of the sulfide minerals. As‐bearing minerals such as tennantite, enargite, and luzonite are common, while galena and Sb‐rich tetrahedrite are scarce. The mineral abundance and chemical composition of the minerals differs from that found in chimneys of the deposit. The sulfur isotope compositions in the minerals are +3.1–5.2‰ for sulfides and +19.6–21.8‰ for sulfate minerals. The homogeneous nature of the sulfur isotopes suggests that sulfur incorporated in the Hakurei deposit came from the reduction of aqueous sulfate in seawater. 相似文献
14.
W. R. Ryall 《Journal of Geochemical Exploration》1979,11(2):175-194
In the Pb-Zn-Ag lodes at Broken Hill, significant Hg remains located in sphalerite and in tetrahedrite inclusions in galena, despite prograde granulite facies regional metamorphism that has resulted in recrystallization of the ore. The stratigraphically uppermost No. 3 lens has the highest Hg content, with sphalerite and galena concentrates containing up to 149,000 ppb and 198,000 ppb Hg, respectively, in Ag-Sb-rich parts of the lode.The No. 2 and 1 lenses and A lode have generally low Hg contents, but narrow tetrahedrite-rich sections contain up to 83,000 ppb Hg in sphalerite concentrates and 82,000 ppb in galena concentrates. The stratigraphically lowermost B lode has a moderately high Hg content with sphalerite concentrates containing from 4400 to 41,000 ppb Hg and galena concentrates from 30 to 21,000 ppb Hg.Programmed heating determinations showed Hg in sphalerite concentrates to be contained principally in the sphalerite structure, with subordinate amounts in tetrahedrite inclusions. Mercury in galena concentrates is almost wholly contained in tetrahedrite inclusions, with lesser amounts in dyscrasite and pyrargyrite.Piercement bodies show increased Pb, Ag, Sb, As and Hg contents due to preferential migration of galena and tetrahedrite. The Hg content of sphalerite in these bodies is approximately doubled relative to the source lode, and the Hg content of galena concentrates is increased sevenfold, due to an increase of tetrahedrite inclusions.Coarse-grained sulfide-gangue pods and pegmatites, which reflect partial melting and remobilization of parts of the lode, have a mean Hg content less than the same volume of host lode. Within these bodies Hg is strongly partitioned into sphalerite, which contains from 14,000 to 33,000 ppb Hg, whereas galena contains only from 10 to 570 ppb Hg, due to the absence of Hg-bearing tetrahedrite inclusions.Within the lode environment, trace amounts of Hg in veins formed during retrograde metamorphism are located in sphalerite which contains up to 29,000 ppb Hg.The presence of significant amounts of Hg in Ag-Sb-As minerals in a siderite-rich vein within the main lode and in the Consols lode (located 700 m from the main lode) indicates that Hg remains associated with these elements over a wide range of conditions.In the wall rocks, there is no Hg halo which is exclusive of disseminated sulfide minerals. Under high-grade regional metamorphism, trace amounts of Hg in the Broken Hill lode are retained within pre-metamorphism host minerals. However, mobilization of Hg does take place in veins associated with retrograde metamorphism after localized breakdown of tetrahedrite. 相似文献
15.
G. Urbano A.M. Meléndez V.E. Reyes M.A. Veloz I. González 《International Journal of Mineral Processing》2007
The galvanic effect between the main associated mineralogical phases in a mineral sphalerite concentrate was evaluated using an alternative methodology. Comparative voltammetric studies were performed between high purity galena mineral (94.65%) and sphalerite concentrate (content of 78.11% sphalerite, ZnS; 13.64% galena, PbS; 0.57% chalcopyrite, CuFeS2; 0.41% cadmium sulfide, CdS; and 0.11% arsenopyrite, FeAsS) using carbon paste electrodes (CPE) in order to identify galvanic interactions that affect their reactivity. The electrolyte was an aqueous solution of 0.1 M NaNO3 (pH 6.5). The results showed that, in sphalerite concentrate, the electrochemical reactivity of the galena was diminished and displaced to more positive potentials with respect to the high purity galena mineral response. This behavior can be attributed to the galvanic protection offered by the sphalerite on the galena, thereby avoiding its free oxidation. On the other hand, sphalerite oxidation was diminished by the formation of a passive products film that is dissolved to more positive potentials which provokes oxidation of other minerals like CuFeS2, (Zn,Cd)S and FeAsS present in a minor proportion in the sphalerite concentrate. 相似文献
16.
四川布托县乌依铅矿床是川滇黔相邻区赋存于奥陶系大箐组地层中的典型密西西比河谷型矿床之一,其成矿物质来源仍不清楚。本文开展了方铅矿和石膏硫同位素及方铅矿稀土元素地球化学研究,获得方铅矿硫同位素δ~(34)S平均值为-4.04‰(n=31),石膏δ~(34)S平均值为29‰(n=15)。方铅矿稀土元素地球化学表明,轻稀土富集,重稀土明显亏损,稀土配分模式曲线大致向右倾,Eu正异常和Ce负异常。结合前人的硫、铅同位素数据,认为乌依铅矿床硫来源于细菌还原地层中硫酸盐所产生的硫,矿石铅来自上地壳,成矿物质来源为奥陶系大箐组,与峨眉山玄武岩无关。 相似文献
17.
I. K. Bonev 《Mineralium Deposita》1977,12(1):64-76
Large gas-liquid inclusions are found in the galena crystals from some hydrothermal lead-zinc deposits. Inclusions' vacuoles are negative crystals. Their habit, macro- and micromorphology and arrangement are studied. Inclusions have a primary character. It is assumed that gas bubbles formed in heterogeneous boiling solutions have played an important role in their formation. The galena surface over the outermost inclusions is plastically deformed, and specific depressions, or infrequently bulges, are formed. The causes and conditions of the deformation are discussed. Similar positive plastic deformation is reproduced experimentally. The liquid released by opening the inclusions evaporates rapidly depositing NaCl and KCl in an epitaxic orientation on the fresh galena cleavage surface. 相似文献
18.
Nengping Shen Zhengwei Zhang Fuhua You Jiantang Peng Xiaoqing Zhu Jiafei Xiao 《中国地球化学学报》2012,31(4):362-375
The polymetallic(Pb,Zn,Cu,etc) ore belt on the southwestern margin of Tarim is one of the major regions with the greatest prospecting potential in Xinjiang.Reported in this paper are the lead isotope data for 66 sulfide samples(including 50 galena samples,15 chalcopyrite samples and 1 pyrite sample) collected from such representative deposits as Tamu,Tiekelike,Kalangu,Abalieke,etc.in this ore belt.The Pb isotopic ratios of 206 Pb/204 Pb,207 Pb/204 Pb and 208 Pb/204 Pb in the galena samples range from 17.931 to 18.176,15.609 to 15.818 and 38.197 to 38.944,with the average values of 18.017,15.684 and 38.462,respectively.Those in the chalcopyrite samples range from 17.926 to 18.144,15.598 to 15.628 and 38.171 to 38.583,with the average values of 18.020,15.606 and 38.262,respectively.The pyrite sample has the Pb isotopic ratios of 206 Pb/204 Pb,207 Pb/204 Pb and 208 Pb/204 Pb to be 17.980,15.604 and 38.145,respectively.In combination with the previous Pb isotope data for sulfides,it is found that there is only a slight variation in the Pb isotopic composition of galena,chalcopyrite,sphalerite and pyrite in the ore belt.However,there is some difference in Pb isotopic characteristics between galena and chalcopyrite,especially the Pb isotopic composition of galena shows an obvious linear correlation with some other relevant parameters(e.g.β and γ).The comprehensive analysis suggested that lead in galena(maybe including sphalerite and pyrite) was derived principally from wall rocks and underlying basement,and that in chalcopyrite only originated from the basement.The single-stage model ages of these sulfides couldn’t indicate the time limit of metallogenesis(Pb,Zn,Cu,etc.),and the positive linear correlations for the Pb isotopic composition of galena are of no single-stage and two-stage Pb-Pb isochron significance.Furthermore,there are significant differences in Pb isotopic composition characteristics between the genetic type of deposits in this polymetallic ore belt and the Mississippi Valley type(MVT).In addition,the authors also pointed out that there is a phenomenon of differentiation(not paragenesis) for lead and copper elements during the process of metallogenesis in this ore belt. 相似文献
19.
筲箕湾铅锌矿床位于黔西北铅锌成矿区中部,为该区铅锌矿床中的又一典型代表,其金属资源量（Pb＋Zn）超过20万t。本文利用电感耦合等离子体质谱（ICP-MS）分析了不同类型矿石中原生矿石硫化物（黄铁矿、闪锌矿和方铅矿）中分散元素含量,结果显示除Cd含量较高外,Ga、In、Se、Tl和Re的富集程度均较低。不同分散元素在硫化物中表现出不同的富集规律,表现为Ga含量在闪锌矿中最高,黄铁矿次之,方铅矿最低;方铅矿中Tl含量高于闪锌矿,黄铁矿最低;Cd在闪锌矿中含量最高,方铅矿次之,黄铁矿最低;从黄铁矿→方铅矿→闪锌矿In含量依次升高;Re含量表现出在闪锌矿中最高,黄铁矿次之,方铅矿最低;Se富集程度从黄铁矿→方铅矿→闪锌矿依次升高。Ga、In和Re在不同颜色闪锌矿中富集程度相似,而Se、Cd和Tl则相对富集在棕色闪锌矿中。统计发现闪锌矿中Zn含量与Cd、Ga含量不呈类质同象的负相关特征,而其中的Fe含量与Cd、Ga含量间表现出曲线相关或负相关特征,暗示Cd、Ga可能是通过替代先进入闪锌矿中的Fe而占据其晶格,这可能是一种新的机制。闪锌矿Ga、Cd、In含量及Ga/In、Zn/Cd比值等参数,指示筲箕湾铅锌矿床形成于中-高温条件,其矿床成因类型与沉积-改造型相似。 相似文献
20.
Claudio Gutiérrez Faustino Martin-Poveda 《International Journal of Mineral Processing》1981,8(2):111-123
The flotation of < 10, 10–20, and 20–40 μm galena fractions was studied. For uncleaned galena a given collector coverage produced better floatability with increasing grain size. Nitrogen had a detrimental effect only for the < 10 μm fraction, producing at a given collector coverage a recovery smaller than that obtained with air.Galena cleaned with 400 g/l ammonium acetate had very poor floatability, although xanthate abstraction was fairly high; this confirms that strong xanthate adsorption is necessary for flotation. Formation of monothiocarbonate was small in all cases, which points to a very minor influence, if any, of this compound in the flotation process.In blank flotation tests, or for very low residual xanthate concentrations, a peak at 208 nm and a shoulder at 255 nm were observed. The former was assigned to the uncomplexed Pb2+ ion, and the latter was tentatively attributed to the PbOH+ ion.Lead in solution results from dissolution of the oxidation products of galena, as galena itself has an exceedingly low solubility. The curve for total lead in solution vs. initial xanthate concentration, had a minimum for an initial xanthate concentration of 10?5M, the further increase in dissolved lead is attributed to formation of complexes such as PbX+ (X = xanthate). Dissolved lead concentrations were nearly as high for cleaned as for uncleaned galena, which indicates a high oxidation rate of the mineral. 相似文献