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四川西部金矿床中有3类金矿含有较多的黝铜矿族矿物,它们与黄铁矿、黄铜矿、方铅矿、闪锌矿和Au-Ag系列矿物共同组成矿石的矿物组合。电子探针分析表明,黝铜矿族矿物的变种有黝铜矿和砷黝铜矿等。在黝铜矿中As-Sb之间呈完全类质同象。在不同类型金矿中,黝铜矿具有不同的特征参数。产于碳酸盐岩系内的地下水热液型金矿中的黝铜矿成分自上而下由富锌锑向富铁砷演变,而且含银量也有降低的趋势。黝铜矿的产出及分带特征对 相似文献
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流体的热力学前缘研究 总被引:12,自引:1,他引:12
总结了当前国内外关于流体的热力学前缘研究领域如下:(1)流体体系的p-V-T-x相关系研究,主要对象是H2O-CO2-盐类多组分体系高温高压下相图的实验和理论研究。(2)矿物在流体中的溶解度及溶解后在流体中溶解类型的形式和热力学性质——平衡常数(或Gibbs自由能)及各种偏摩尔性质的研究。(3)流体热力学模型化研究,已研制出大量的计算机软件,包括多种矿物、溶解类型的热力学数据库和模拟热液平衡、矿物溶解性质、反应路径和水—岩相互作用的实用程序。(4)超临界流体的相关系和化学反应等有许多特殊的性质,对认识地球内部的演化将有重要意义。(5)新技术新方法的发展,使分析单个矿物包裹体成分变成了现实。 相似文献
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Using thermodynamic data, the authors have calculated the equilibrium constants (at high temperatures and pressures) for 47 reactions among 18 kinds of minerals present in the Meishan iron deposit, and constructed equilibrium diagrams of the mineral paragenesis.On this basis, they have discussed the physicochemical conditions of formation of the depo.sit and the relations between mineralization and wall-rock alteration. 相似文献
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Metallogenic Mechanism of the Tianbaoshan Pb—Zn Deposit,Sichuan 总被引:5,自引:3,他引:5
The Tianbaoshan Pb-Zn deposit in Sichuan Province,exhibiting open-space-filling and /or replacement textures,occurs as being of vine style in the Sinian(Late Proterozoic) carbonate rocks,and is simple in ore composition.A systematic study of lead isotope and rareearth elements reveals that the ore-forming materials were derived from multiple sources.The ultimate source of the sulfur in all stages in seawater sulfate but the reducing mechanisms are different,The carbon was derved from marine carbonate and organic matter,The ore-forming fluid,meteoric in origin,belongs to a Ca^2 -Mg^2 -Cl^--Hco3^- type of weak acidic to alkalic solutions with a salinity of about 5wt% NaCl.The ore was formed at the depth of about 1 km from 150 to 250℃ during the main stage of ore deposition.The heated meteoric water,after extracting ore materials from wall rocks,evolved into ore-forming solution with a low salinity, in which metals were trasported as chloride complexes such as PbCl,ZnCl and ZnCl.The metal-bearing solution moved upward along deep faults to low-pressure zones,where the metal ions reacted with reduced sulfur and were precipitated as sulfied minerals.The textures of the minerals were controlled by the rate at which the reduced sulfur was supplied. 相似文献
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四川石棉金矿床中的黝铜矿族矿物 总被引:3,自引:0,他引:3
四川石棉西部碳酸盐岩系中的金矿床产于泥盆系中统,受层间蚀变破碎带控制。其中分布有为数较多的黟同矿族矿物,与黄铁矿、黄铜矿、方铅矿、闪锌矿和Au-Ag系列矿物共同组成矿石的矿物组合和Au-Cu-Ag-Pb-As-Sb-Bi的元素组合。电子探针分析表明黝铜矿族矿物有同铜矿、黝铜矿、砷黝铜矿和锌砷黝铜帮等,其中,Fe-Zn、AsSb之间分别呈完全类质同象。在垂向上,黝铜矿的成分自上而下由富锌锑向富铁砷演 相似文献
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普弄巴金矿床黄铁矿的标型特征 总被引:1,自引:0,他引:1
笔者对本地区金矿床中黄铁矿的晶体结构形态、物理性质、微量元素及同位素进行了研究,结果表明:黄铁矿晶形呈五角十二面体,八面体-五角十二面体、立方体-五角十二面体聚晶富Au;黄铁矿的晶胞参数(a)、热电系数(α)与砷、金关系密切,基本上成正相关关系;黄铁矿质变热电系数的测定表明本区金矿床为中低温矿床;本区金矿床中的黄铁矿多数为空穴型,据其空间分布特征,认为本区金矿床深部可能有一定勘探远景;同位素研究表 相似文献
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宁芜型铁矿(也叫玢岩铁矿)在成因上与火山岩、次火山岩有关,广泛分布于长江中下游一带。它们的共同特点是从高温到中低温的热液围岩蚀变很发育,蚀变与成矿作用关系密切。本文参考Hclgeson等人关于水-岩石相互作用,质量转移的不可逆过程热 相似文献
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This paper deals with the mechanism of dissolution reaction kinetics of minerals in aqueous solution based on the theory of surface chemistry.Surface chemical catalysis would lead to an obvous decrease in active energy of dissolution reaction of minerals.The dissolution rate of minerals is controlled by suface adsorption,surface exchange reaction and desorption,depending on pH of the solution and is directly proportional to δH^n0 ,When controlled by surface adsorption,i.e.,nθ=1,the dissolution rate will decrease with increasing pH;when controlled by surface exchane reaction,i.e.,nθ=0,the dissolution rate is independent of pH;when controlled by desorption,nθis a positive decimal between 0 and 1 in acidic solution and a negative decimal between-1 and 0 in alkaline solution.Dissolution of many minerals is controlled by surface adsorption and/or surface exchange reactions under acid conditions and by desorption under alkaline conditions. 相似文献