湘南铜山岭铜铅锌矿床闪锌矿矿物化学特征及其成矿指示意义
Mineral chemical characteristics of sphalerites from the Tongshanling Cu-Pb-Zn deposit in southern Hunan and their metallogenic implications
黄旭栋 1陆建军 2高剑峰 3章荣清 2SIZARET Stanislas 4马东升 2王汝成2
作者信息
- 1. 南京师范大学海洋科学与工程学院,南京 210023
- 2. 南京大学地球科学与工程学院,内生金属矿床成矿机制研究国家重点实验室,南京 210023
- 3. 中国科学院 地球化学研究所,矿床地球化学国家重点实验室,贵阳 550081
- 4. Institut des Sciences de la Terre d'Orléans,UMR 7327-CNRS/Université d'Orléans/BRGM,Orléans 45071,France
- 折叠
摘要
为探讨湘南铜山岭铜铅锌矿床的形成过程,本文对不同类型矿石中的闪锌矿开展了电子探针成分分析.结果表明,Fe主要通过直接置换Zn的方式进入闪锌矿,Cd可能通过与Fe耦合置换Zn的方式(Cd2++Fe2+↔2Zn2+)进入闪锌矿,含铜矿石的闪锌矿中可能含有亚显微级黄铜矿包裹体.闪锌矿的Fe、Cd含量和Fe/Zn、Zn/Cd值的变化指示近端内矽卡岩、近端外矽卡岩和远端矽卡岩矿体依次形成,铜硫化物-石英脉、铜铅锌硫化物-石英脉和铅锌硫化物-石英脉矿体依次形成,碳酸盐交代型矿体形成较晚.结合矿床地质和闪锌矿矿物学特征,本文认为铜山岭铜铅锌矿床可能存在两期流体出溶,早期出溶温度较高的含Cu、Pb、Zn流体,引起近端内矽卡岩、近端外矽卡岩、远端矽卡岩、铜硫化物-石英脉和铜铅锌硫化物-石英脉矿化;晚期出溶温度较低的含Pb、Zn流体,导致铅锌硫化物-石英脉型和碳酸盐交代型矿化.
Abstract
Electron microprobe analyses have been conducted on sphalerites in different types of ores to constrain the ore-forming process of the Tongshanling Cu-Pb-Zn deposit in southern Hunan.The results suggest that Fe occurs mainly in form of direct substitution for Zn and Cd occurs probably in form of coupled substitution with Fe for Zn(Cd2++Fe2+↔2Zn2+)in sphalerite lattice,and submicroscopic chalcopyrite inclusions likely exist in the sphalerites of Cu-bearing ores.The variations of Fe,Cd contents and Fe/Zn,Zn/Cd ratios of sphalerites indicate that the proximal endo skarn,proximal exoskarn,and distal skarn orebodies were sequentially formed,the Cu sulfide-quartz vein,Cu-Pb-Zn sulfide-quartz vein,and Pb-Zn sulfide-quartz vein orebodies were sequentially formed,and the carbonate replacement orebodies were formed in the late stage.Based on characteristics of deposit geology and sphalerite mineralogy,it is believed that there could be two episodes of fluids exsolved from granodioritic magma in the Tongshanling Cu-Pb-Zn deposit.The earlier exsolved fluid was a kind of relatively high-temperature Cu-Pb-Zn-bearing one which resulted in the proximal endoskarn,proximal exoskarn,distal skarn,Cu sulfide-quartz vein,and Cu-Pb-Zn sulfide-quartz vein mineralization;while the later exsolved fluid was a kind of relatively low-temperature Pb-Zn-bearing one which resulted in the Pb-Zn sulfide-quartz vein and carbonate replacement mineralization.
关键词
闪锌矿/电子探针/矿物化学/矽卡岩铜铅锌矿床/成矿过程/铜山岭Key words
sphalerite/electron microprobe/mineral chemistry/skarn Cu-Pb-Zn deposit/ore-forming process/Tongshanling引用本文复制引用
基金项目
国家自然科学基金(41903039)
国家自然科学基金(42025301)
中国博士后科学基金(2019M661792)
中国地调局地质调查项目(12120113067300)
国家留学基金中法蔡元培交流合作项目()
出版年
2024
NETL
NSTL
万方数据