投稿时间：2013-01-06
修订日期：2014-01-14
网络发布日期：2014-10-23
中文摘要: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 Å；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。
Abstract: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 mineralization Ⅰ phase (HMⅠ) whereas pyrites in the hydrothermal mineralization Ⅱ phase (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 the a of pyrite is 5.4300~5.4325 Å, which gradually becomes larger from HM Ⅰ to HM Ⅱ, 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, c and β are 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.
keywords:geology typomorphic characteristics gold-bearing minerals Zhesang gold deposit Yunnan-Guizhou-Guangxi gold triangle
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中图分类号：P618.51
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基金项目:本文得到国家自然科学基金重点项目（编号：40930423）；国家重点基础研究发展计划（973）（编号：2014CB440903）；国家自然科学基金面上项目（编号：41372093）；教育部高校博士点基金项目（编号：2009512212000）；成都理工大学中青年骨干教师培养计划项目；高等教育质量工程项目《矿相学》优秀教材建设（编号：XJC1105）联合资助
引用文本：
代鸿章,陈翠华,顾雪祥,李保华,董树义,程文斌.2014.云南者桑金矿床载金矿物标型特征研究[J].矿床地质,33(1):70~86DAI HongZhang,CHEN CuiHua,GU XueXiang,LI BaoHua,DONG ShuYi,CHENG WenBin.2014.Typomorphic characteristics of gold-bearing minerals in Zhesang gold deposit, Yunnan Province[J].Mineral Deposits33(1):70~86
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