| 金廷福,潘佩荣,李其,肖荣洋,蒙宇乐.黔东南同古金矿床地质特征再认识[J].地质找矿论丛,2014,29(3):375-380 |
| 黔东南同古金矿床地质特征再认识 |
| The geological features and re-evaluation of Tonggu gold deposit in southeast Guizhou |
| 投稿时间：2013-03-12 修订日期：2013-06-13 |
| DOI：10.6053/j.issn.1001-1412.2014.03.010 |
| 中文关键词: 同古金矿床 再认识 地质特征 黔东南 |
| 英文关键词:re-evaluation geological features Tonggu gold deposit the southeast Guizhou |
| 基金项目: |
|
| 摘要点击次数: 1597 |
| 全文下载次数: 1229 |
| 中文摘要: |
| 黔东南同古金矿床属于中-低温热液石英脉型以及构造蚀变岩型，以石英脉型为主。矿体产于石英脉中，尤其集中在石英颜色为乳白色或烟灰色、硫化物种类和数量突然增多、脉体细小、黄铁矿颗粒细小而密集的石英脉段。该矿床成矿具有多阶段性：雪峰运动使凝灰质浊积岩中的金质初步富集，形成金的高丰度层；加里东期形成富Au热液、导矿的断裂通道和容矿构造，并富集成矿；燕山运动进一步改造或叠加，形成再次富集。通过对比黔东南区域金矿成矿要素、金矿化阶段矿物组合特征、花桥金矿区钻孔和坑道资料，结合同古金矿主要矿化（加里东期大量的变质热液）温度启示，该矿区矿化主要集中于150~300℃，但变质碎屑岩金矿化最有利的温度为300~320℃。同古金矿中的矿物共生组合中多金属硫化物较少，认为目前勘探的部位应该位于石英-黄铁矿-碳酸盐-贫金阶段（即金矿化垂直分带中的上部带），富集金矿的石英-简单硫化物-较多金和石英-多金属硫化物-富金阶段的金矿体还应位于更深一些的部位，目前的勘探深度仅限于地表以下300 m内，因此对同古矿区300 m以下的深部隐伏矿体仍有必要进行积极的探索。 |
| 英文摘要: |
| Tonggu gold deposit is composed of quartz vein type gold ore and altered cataclastic rock type gold ore but dominated by the former. Ore body occurs in quartz vein, especially at places where milky or smoky grey quartz occur, type and amount of sulfide increase abruptly, fine veins occur and fine pyrite is concentrated. The deposit is characterized by multiple metallogenic stages. Gold is primarily enriched in tuffaceous turbidite during Xuefeng Movement and the high gold abundance bed was formed; the Au-rich fluid and the conductive and host fractures and concentration of the fluid and precipitate as ore formed during Caledonian Movement; further enrichment made by modification and overprinting of the fluid during Yanshanian Movement. Combined with enlightenment of the ore-forming temperature of gold mineralization of Tonggu gold deposit (large volume of Caledonian metamorphic hydrothermal fluid) comparison of the ore-forming elements in the southeast Guizhou and combination characteristics of mineral assemblages of each metallogenic stage and excavation data of Huaqiao area were made and gold mineralization in Tonggu area is concentrated in range of 150~300℃ and gold mineralization of meta-clastic rock favors the range 300-320℃. According to fewer metal sulfides in the mineral assemblage of Tonggu gold deposit it is considered that exploration projects nowadays here hit the gold-poor quartz-pyrite-carbonate stage that occurs at upper position of zoning of the mineralization and the gold-rich quartz-simple sulfide-more gold and quartz-polymetallic sulfides-gild-rich stage should occur at deeper position. The present exploration is limited to 300m under surface and the exploration should be deepened to hit deep blind ore bodies. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
