| 杨治,徐先宇,邓宇峰,谭荣,余振东,杜东旭.皖北地区杨桥孜矽卡岩型铜金矿床不同金矿石金的赋存状态研究[J].矿产勘查,2025,16(6):1335-1345 |
| 皖北地区杨桥孜矽卡岩型铜金矿床不同金矿石金的赋存状态研究 |
| Study on the occurrence state of gold in different gold ores from the Yangqiaozi skarn-type copper-gold deposit in northern Anhui Province |
| 投稿时间：2024-02-21 |
| DOI：10.20008/j.kckc.202506004 |
| 中文关键词: 矽卡岩型铜金矿床 矿床地质特征 金矿石 金赋存状态 金的沉淀机制 杨桥孜 皖北地区 |
| 英文关键词: skarn-type-copper gold deposit geological characteristics of ore deposit gold ore gold occur.rence state gold precipitation mechanism Yangqiaozi northern part of Anhui |
| 基金项目:本文受安徽省自然资源科技项目(2020-K-14)资助。 |
|
| 摘要点击次数: 1040 |
| 全文下载次数: 1390 |
| 中文摘要: |
| 杨桥孜矽卡岩型铜金矿床是安徽皖北地区探明的最大的金矿床。前人对该矿床的控矿构造、岩体及地层做了详细的研究，但是关于金的赋存状态及金的沉淀机制等方面研究较少，本文基于手标本观察和显微镜下鉴定，将该矿床成矿阶段划分为 2期 5阶段。发现金矿石可分为 3类:含石英-硫化物金矿石、含磁黄铁矿金矿石、含磁铁矿金矿石。含石英-硫化物金矿石主要由石英、黄铁矿及黄铜矿等矿物组成，属早期硫化物阶段；含磁黄铁矿金矿石主要由磁黄铁矿、方解石、黄铜矿、斑铜矿及黄铁矿组成，属早期硫化物阶段。含磁铁矿金矿石可以分为两类，一类主要由磁铁矿、透辉石及黄铁矿组成；另一类为含穆磁铁矿金矿石，主要由穆磁铁矿、石英、方解石、黄铜矿及少量的透辉石组成，属晚矽卡岩阶段。结合电子探针实验，发现含石英-硫化物金矿石中金主要以包裹金和裂隙金的形式赋存于黄铜矿内；含磁铁矿金矿石中的金主要以包裹金，裂隙金的形式赋存于磁铁矿、石英和黄铁矿中；含磁黄铁矿金矿石中以包裹金的形式赋存于黄铁矿中。矿石成矿元素分析发现金与铜、锌呈一定正相关，与碲具有较好正相关性，表明金是以金碲络合物的形式运移，最后以碲金矿、银金矿或自然金的形式沉淀。 |
| 英文摘要: |
| The Yangqiaozi skarn-type copper-gold deposit is the largest gold deposit currently discovered inthe northern part of Anhui Province. Previous studies have conducted detailed investigations on ore-controllingstructures, intrusions, and stratigraphy of this deposit. However, research concerning gold occurrence states and pre.cipitation mechanisms remains limited. Based on the observation of hand specimens and microscopic identifica.tions, this study divides the metallogenic processes of the deposit into two periods and five stages. Three types ofgold ores are identified: 1)quartz-sulfide-bearing gold ore in the early sulfide stage that primarily composed ofquartz, pyrite, and chalcopyrite; 2)pyrrhotite-bearing gold ore in the early sulfide stage that primarily composed ofpyrrhotite, calcite, chalcopyrite, bornite, and pyrite; and 3) magnetite-bearing gold ore in the late skarn stage thatfurtherly subdivided into two subtypes: one is mainly dominated by magnetite, diopside and pyrite, and another con.taining Mumagnetite, quartz, calcite, chalcopyrite with minor diopside. Electron probe microanalysis reveals that inquartz-sulfide ores gold primarily exists as inclusion and fracture gold within chalcopyrite; magnetite-bearing oreshost gold mainly as inclusions and fracture gold within magnetite, quartz and pyrite; while pyrrhotite-bearing orescontain gold predominantly as inclusions in crystals of pyrite. Ore-forming elements analysis found that the gold inores is positively correlated with copper, zinc, and tellurium, indicating that gold was transported with the form ofgold-tellurium complex and ultimately precipitated as calaverite, electrum, or native gold. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|