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排序方式: 共有110条查询结果,搜索用时 93 毫秒
21.
锑矿化集中于喜马拉雅期石英斑岩内接触带,存在矿源层形成、充分分异及近地表成矿三个阶段。可作为滇西碱性岩锡矿床典型。 相似文献
22.
Computer thermodynamic modeling of the transport and deposition of Sb and Au during the formation of Au-Sb deposits 总被引:1,自引:0,他引:1
A.A. Obolensky L.V. Gushchina A.S. Borisenko A.A. Borovikov P.A. Nevolko 《Russian Geology and Geophysics》2009,50(11):950-965
Using the Chiller computer program, we performed modeling of the mechanisms of the joint transport and deposition of Au and Sb from various ore-forming solutions during the formation of Au-Sb deposits. Three models are considered by the example of the Uderei Au-Sb deposit in the Yenisei Ridge: (1) simple cooling (cooling only), (2) iso-enthalpy boiling (P = f(T)), and (3) solution–rock interaction (rock titration model). The behavior of Sb(III) and Au(I) in the system Au–Sb–Fe–Cu–Pb–Zn–As–H2O–Cl–H2S–CO2 under hydrothermal conditions was studied. It is shown that both weakly alkaline (near-neutral) and reduced acidic Feaq2+-enriched low-chloride high-CO2 and high-chloride hydrothermal solutions play a crucial role in the formation of gold parageneses of Au-Sb ores. 相似文献
23.
The effect of extraordinary degradation of phenol organics on the SnO2‐Sb2O3/Ti electrode is investigated through experimental research and theoretical analysis. The phenol organics contained 4‐chloro‐phenol, 4‐bromo‐phenol, and 2‐iodo‐phenol. At a current density of 4 mA cm–2 and an electrolysis time of 12 h, the degradation efficiency of the phenols was over 98% with a relatively short degradation time, whereas the degradation time of the PbO2/Ti electrode surpassed 40 h while delivering 100% disposal efficiency. Therefore, the effectiveness of electrochemical (EC) oxidation by the SnO2‐Sb2O3/Ti was superior to that of the PbO2/Ti electrode. At the same time, the SnO2‐Sb2O3/Ti had higher oxygen generation potential and lower electron consumption than the other electrodes. This was mainly due to the effect of the middle Sb2O3 layer, which due to its high porosity and good catalytic effect, contributed to a better catalysis than the SnO2 part. 相似文献
24.
油菜籽品质及重金属污染程度直接关系到人类健康,对油菜籽中As、Sb、Cd和Tl等有毒元素含量进行监测有助于对食用油生产原材料的提前监控。避开强酸消解前处理的繁琐,为了实现快速测定菜籽中As、Sb、Cd和Tl等易挥发有毒元素的准确含量,以及解决粮油食品脂肪含量高对前处理的挑战,本文采用一种悬浮-乳化协同制样技术,详细考察了影响悬浮-乳化的诸多条件,制得均匀稳定的悬浮-乳化试液(Slurry-Emulsion Solution, SES)体系。在进样效率高的电热蒸发器(ETV)中,优化程序升温参数和改进剂硝酸钯的用量,SES直接进样,采用电感耦合等离子体质谱(ICP-MS)测定了油菜籽中As、Sb、Cd和Tl。该方法对As、Sb、Cd和Tl的相对标准偏差(RSD)分别为10.1%、8.8%、8.9%、6.4%[c=0.5%(m/V),n=5]。在最佳实验条件下,As、Sb、Cd和Tl检出限(3σ)分别为40.0ng/L、20.0ng/L、50.0ng/L和10.0ng/L,对应原始固体样品的检出限(3σ)分别为8.0ng/g、4.0ng/g、10.0ng/g和2.0ng/g。菜籽样品中As... 相似文献
25.
氢化物发生-原子荧光光谱法测定土壤中水溶态和可交换态锑(Ⅲ)和锑(Ⅴ) 总被引:2,自引:2,他引:0
在0.10 mol/L酒石酸介质中,采用氢化物发生-原子荧光光谱法测定土壤中水溶态和可交换态Sb(Ⅲ)和Sb(Ⅴ)。以氢气发生器为氩-氢火焰提供氢气,明显降低了硼氢化钾浓度,改善了测定检出限。考察了酒石酸掩蔽Sb(Ⅴ)的量及共存干扰元素的允许量。方法检出限Sb(Ⅲ)为0.026 ng/L,总Sb为0.019 ng/L。加标回收试验表明,方法准确、可靠。 相似文献
26.
湖南前寒武系锑金矿床成矿的独特性 总被引:11,自引:1,他引:11
在湖南前寒武系不同矿物组合的金矿床中 ,锑金矿床是常见的一类。矿床主要赋存于前寒武系一套厚大的、富含火山物质的浅变质岩系中。成矿严格受断裂破碎带或脆 韧性剪切带控制。辉锑矿是Au的主要载体矿物之一 ,含Au 0 17× 10 - 6~ 110× 10 - 6,Au的分布率为 15 1%~38 2 %或更高。锑金矿化具有明显的时间连续性和空间分带性。富Au辉锑矿以早期细粒、富含As以及Se、Te等杂质和具有轻S同位素组成为特征。成矿流体的∑S浓度、成矿温度及围岩的介质条件是控制锑金矿床成矿的主要因素 相似文献
27.
28.
Sulfur Isotope Geochemistry of the Supergiant Xikuangshan Sb Deposit, Central Hunan, China: Constraints on Sources of Ore Constituents 总被引:2,自引:0,他引:2
Dong-sheng Yang Masaaki Shimizu Hidehiko Shimazaki Xian-hua Li Qing-lin Xie 《Resource Geology》2006,56(4):385-396
Abstract. The supergiant Xikuangshan Sb deposit is located in the Middle to Upper Devonian limestone of central Hunan, China. Primary ores are composed of early-stage stibnite and calcite with rare pyrite, early main-stage stibnite and quartz, and late main-stage stibnite and calcite. New sulfur isotope data reveal the clustering of δ34 S values (+5 ∼ +8 %) for both early and late main-stage stibnite; a single early-stage stibnite exhibits δ34 S value (+7.5 %) identical to its main ore-stage counterparts and the coexisting calcite has almost unmodified carbon isotope composition (-4.4 %). The data suggest a probable common source of sulfur for stibnite that was deposited at different paragenetic stages. A much wider variation in δ34 S values for early main-stage stibnite (+3.5 to +16.3 %, av. +7.5 %) compared to that for late main-stage stibnite (+5.3 to +8.1 %, av. +6.2 %) can be interpreted to be due to local interaction of earlier ore fluid with Devonian host rocks. The previous studies show that the Precambrian basement contains elevated Sb concentrations, and two distinctive sulfur reservoirs with δ34 Spyrite values at ca. +11 ∼ +24 % and -7.0 ∼-11 %. The homogenizing effect for sulfur hydrothermally leached from the two reservoirs might have provided ore constituents for the Xikuangshan fluids. 相似文献
29.
滇黔桂地区汞锑金砷等低温矿床组合碳,氢,氧,硫同位素地球化学 总被引:18,自引:1,他引:18
滇黔桂地区分布着众多大中型Hg、Sb、Au矿床。通过对碳、氢、氧、硫等同位素的分析表明:大厂锑矿的硫来自地幔,木利、马雄锑矿的硫主要来自海水硫酸盐。各金矿的硫主要来自围岩,但碳大部分来自围岩。氢氧同位素数据表明,本区锑、金、汞等矿床的成矿流体来源相似,其主要来源为与围岩进行了氢氧同位素交换的大气降水。 相似文献
30.
A. Kyono M. Kimata M. Matsuhisa Y. Miyashita K. Okamoto 《Physics and Chemistry of Minerals》2002,29(4):254-260
The crystal structure of stibnite [Sb2S3, Pnma, a=11.314(2), b=3.837(2), c=11.234(3) Å, V= 487.7(3) Å3 at 293 K] was refined in situ at 230, 173, and 128 K. It is a major characteristic of the structure that the Sb–S secondary bonds enclosing Sb 5s2 inert lone-pair electrons at 293 K are significantly shorter than the corresponding sum of the Sb and S van der Waals radii. Concerning the temperature dependence, although both the polyhedral volume and the cation eccentricity of the two SbS7 polyhedra exhibit continuous contractions with decreasing temperature, the sphericity values remain constant, indicating isotropic shrinkage. Consequently, the geometries of Sb 5s2 inert lone-pair electrons and ligand atoms remain unchanged at low temperatures. This is because the crystal structure of stibnite at low temperature induces contraction with attractive interactions, which is called the orbital overlap between Sb 5s2 inert lone-pair electrons and ligand orbitals to maintain the coordination environment. In this case, Sb 5s2 lone-pair electrons are not inert, but active. Such orbital overlaps of inert lone-electron pairs can provide a reasonable explanation for shorter secondary bonds and lower band gap energy of the binary compounds containing heavy elements such as Sb, Te, Pb, and Bi, which are key factors in tracing the origins of color, luster, and semiconductivity of their minerals or compounds. 相似文献