| 云南维西大宝山铜矿地质特征及矿石中Ag与Cu关系探讨 |
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| 引用本文： | 巩,鑫.云南维西大宝山铜矿地质特征及矿石中Ag与Cu关系探讨[J].地质与勘探,2020,56(1):49-58. |
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| 作者姓名： | 巩 鑫 |
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| 作者单位： | 贵州有色金属与核工业地质勘查局地质矿产勘察院，贵州贵阳； 中国地质大学（北京）地球科学与资源学院，北京 |
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| 摘 要： | 云南维西大宝山铜矿区位于青藏高原东南缘,哀牢山-金沙江构造带西北部雪龙山成矿带中,是典型的中低温热液矿床。矿区主要包括望香台及滑石板矿段,根据矿床、矿体特征及详尽的镜下观察,将矿石类型划分为氧化矿、硫化矿及混合矿。氧化矿主要包括孔雀石及蓝铜矿,多分布在望香台矿段中浅部,是辉铜矿次生氧化富集作用的结果,出露形式多以混合矿产出;硫化矿主要包括辉铜矿及黄铜矿,且独立组成不同的矿物组合类型,分别为望香台矿段、滑石板矿段的主要矿石矿物。不同的矿石组合类型所含矿物种类、矿石结构构造不尽相同。通过对不同样品进行化学分析测试,发现在硫化矿辉铜矿等矿物组合中,Cu品位越高,相应Ag品位越高,存在一定的线性关系;而在硫化矿黄铜矿矿体中,Ag含量与Cu品位无相应关系;混合矿(辉铜矿、孔雀石及蓝铜矿)中此类关系更加显著。此外,辉铜矿、孔雀石、蓝铜矿单矿物矿石及混合矿矿石中含有硫砷铜银矿、深红银矿、雌黄及雄黄等伴生矿物,而黄铜矿中矿物种类较为单一。综合矿区地质特征、矿体分布特征、矿物组合类型认为,矿区中辉铜矿、孔雀石、蓝铜矿等组合类型为含银矿物的主要载体。
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| 关 键 词： | 铜硫化矿 铜氧化矿 Cu、Ag相关性 大宝山铜矿 维西 云南 |
| 收稿时间： | 2018/12/3 0:00:00 |
| 修稿时间： | 2019/9/20 0:00:00 |
Geological characteristics and the relationship between Ag and Cu in the ores of the Dabaoshan copper deposit in Weixi, Yunnan Province |
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| Gong Xin.Geological characteristics and the relationship between Ag and Cu in the ores of the Dabaoshan copper deposit in Weixi, Yunnan Province[J].Geology and Prospecting,2020,56(1):49-58. |
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| Authors: | Gong Xin |
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| Institution: | Institute of Geology and Exploration, Guizhou Nonferrous Metal and Nuclear Industry Geological Exploration Bureau, Guiyang; School of Earth Sciences and Resources, China University of Geosciences (Beijing),Beijing |
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| Abstract: | As a typical medium-low temperature hydrothermal deposit, the Dabaoshan mining area of Weixi, Yunnan lies in the Xuelongshan metallogenic belt, the northwestern section of the Ailaoshan-Jinshajiang tectonic zone on the southeastern edge of the Tibetan Plateau. Its ore bodies are concentrated in the Wangxiangtai and Huashiban mine sections. According to the characteristics of the deposit and ore body and detailed microscopic observation, ores are classified into oxidized copper, sulfided copper and mixed copper. The oxidized copper ore mainly includes malachite and cyanite, which are mostly distributed in the middle and shallow part of the Wangxiangtai section. They are the result of secondary oxidation and enrichment of chalcocite, exposing as mixed minerals. The sulfided copper comprises copperite and chalcopyrite, independently constituting different mineral combination types, which are the main ore minerals in the Wangxiangtai and Huashiban sections, respectively. The mineral types and ore structures of different ore assemblages are variable. Chemical analysis on samples shows that the higher the Cu grade, the higher the corresponding Ag grade in the mineral combination such as sulphide ore and chalcocite, with a certain linear relationship. However, Ag content has no relation with Cu grade in the sulfide chalcopyrite. Such relationships are more pronounced in mixed copper ore (chalcocite, malachite, and cyanite). In addition, single mineral and mixed ores of chalcocite, malachite, and cyanite contain single mineral and mixed ores such as polybasitepearceite, pyrargyrite, orpiment and realgar. While the mineral types of chalcopyrite are relatively simple. Integrating the geological characteristics, orebody distribution and mineral assemblage types of the mining area suggests that the main carriers of silver-bearing minerals are chalcocite, malachite and cyanite in the mining area. |
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| Keywords: | copper sulphide ore copper oxide ore correlation between Cu and Ag Dabaoshan copper deposit Weixi Yunnan |
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