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云南者桑金矿床载金矿物标型特征研究
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摘要
者桑金矿床处在滇黔桂"金三角"构造带中,该矿床的形成经历了沉积成岩期、热液成矿期及表生氧化期,黄铁矿及毒砂为矿床的重要载金矿物。通过岩相学特征、标型矿物研究,发现热液成矿Ⅰ阶段中主要载金矿物为毒砂,热液成矿Ⅱ阶段为金矿化最主要阶段,主要载金矿物为黄铁矿。黄铁矿呈胶状、细粒状、破碎状;毒砂呈粗粒板柱状,维氏硬度偏低为其载金标型。晶胞参数测试表明,黄铁矿a值在5.4300~5.4325之间,成矿Ⅰ阶段至成矿Ⅱ阶段a值逐渐变大。载金毒砂明显富S、Co亏As,导致b、c、β均低于理论值。各成矿阶段的黄铁矿及毒砂中主量、微量元素及硫同位素组成呈现一定变化规律,成矿物质主要来自于富含有机质的围岩。者桑金矿床为中低温热液矿床。
        The Zhesang gold deposit located in the structural belt of Yunnan-Guizhou-Guangxi gold triangle structural belt.The formation of the Zhesang gold deposit experienced three stages,i.e.,sedimentary diagenesis,hydrothermal mineralization and supergenic oxidation.Pyrites and arsenopyrites are two major Au-bearing minerals.Petrographic and typomorphic observations reveal that arsennopyrites were formed in the hydrothermal mineralizationⅠphase(HMⅠ)whereas pyrites in the hydrothermal mineralizationⅡphase(HMⅡ),which was the primary gold formation phase.The gold-bearing pyrites are colloidal,fine-gained or fragmentized,while the gold-bearing arsenopyrites are in the coarse columnar form.Both of them have low reflectance.Lattice parameter measurement indicates that theaof pyrite is 5.4300~5.4325,which gradually becomes larger from HMⅠto HMⅡ,suggesting that As was concentrated in the hydrothermal mineralization stage.Gold-bearing arsenopyrites are rich in S,Co and poor in As and,as a result,b,candβare lower than their theoretical values.Similarities of geochemical and S isotopic compositions between pyrites and arsenopyrites imply that organic wall rock contributed most of the metallogenic materials.It is thus concluded that the Zhesang gold deposit is a middle-low temperature hydrothermal deposit.
引文
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