粤西黄泥坑金矿矿物生成序列:显微岩相-矿相学及SEM-EDS限定

发布时间：2018-02-12 22:06

  本文关键词： 黄泥坑金矿 钦杭成矿带 矿物生成序列 SEM-EDS 造山型金矿　出处：《中山大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：黄泥坑金矿为近年在钦杭成矿带南段广宁-罗定断裂带内新发现的金矿,基础研究几近空白。主要对黄泥坑金矿矿石和围岩进行系统显微岩相-矿相学研究,并结合SEM-EDS形貌和成分分析,查明其矿物生成序列,为限定其矿床成因提供证据。研究表明,黄泥坑含金石英脉型矿体产于绿片岩相变质的寒武系水石组砂岩中,主要的围岩蚀变为绿泥石化、绢云母化和碳酸盐化。主要矿石矿物包括银金矿、毒砂、黄铁矿、闪锌矿、方铅矿、黄铜矿、辉钼矿和硫锑铜银矿等,主要脉石矿物为石英、绿泥石、绢云母、碳酸盐矿物、金红石、磷灰石、锆石和独居石等。根据矿物相互穿插交代关系和化学成分差异识别出了4个主要成矿阶段:(1)绿泥石-绢云母化阶段;(2)黄铁矿-毒砂-多金属硫化物阶段;(3)黄铁矿-毒砂-银金矿阶段;(4)碳酸盐化阶段。其中银金矿呈颗粒状和裂隙状产出于黄铁矿和毒砂之间,主要出现在黄铁矿-毒砂-银金矿阶段。黄泥坑金矿矿床地质及矿物生成序列与造山型金矿一致,初步认为黄泥坑金矿为钦杭结合带南段的一个典型的造山型金矿。
[Abstract]:The Huangjikeng gold deposit is a newly discovered gold deposit in the southern section of the Qinghang metallogenic belt in recent years. The basic research is almost blank. The systematic microfacies and mineralogy of the ore and surrounding rock of the Huangjikeng gold deposit are studied. In combination with the SEM-EDS morphology and composition analysis, the mineral formation sequence is identified, which provides evidence for defining the genesis of the deposit. The study shows that the Huangjikeng gold-bearing quartz vein type orebody occurs in the Cambrian water-bearing sandstone with greenschist facies metamorphism. The main ore minerals include silver gold ore, arsenopyrite, pyrite, sphalerite, galena, chalcopyrite, molybdenum and sulphide copper and silver, etc. The main gangue minerals are quartz. Chlorite, sericite, carbonate minerals, rutile, apatite, Zircon and monazite, etc. According to the intercalation metasomatism of minerals and the difference of chemical composition, four main metallogenic stages: 1) chlorite sericite stage and 2) pyrite-arsenopyrite-polymetallic sulphide stage (Xian3) pyrite have been identified. -arsenopyla-silver-gold deposit stage: carbonation stage, in which silver gold deposits occur in granular and fissured form between pyrite and arsenopyrite, The geological and mineralogical sequence of the Huangjikeng gold deposit is consistent with that of the orogenic gold deposit. It is preliminarily considered that the Huangjikeng gold deposit is a typical orogenic gold deposit in the southern section of the Qinghang joint belt.
【作者单位】： 中山大学地球科学与工程学院;广东省海洋地质调查院;
【基金】：科技部国家重点研发计划(2016YFC0600506) 广东省自然科学基金(2016A030310210) 国家自然科学基金(41502068和41402165) 广州市“珠江科技新星”计划(201710010027)
【分类号】：P618.51
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本文编号：1506664