In Situ Trace Element Analysis of Pyrite from Bangbu Orogenic Gold Deposit and Its Metallogenic Significance
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摘要: 邦布金矿床是目前在雅江缝合带研究程度最高且唯一正在开采的大型造山型金矿床.为理解邦布金矿床中金的来源及迁移沉淀机制，运用原位微区分析技术对邦布矿床中不同世代含金黄铁矿的微量元素组成进行测定.结果显示，亲铁元素Co、Ni主要以类质同象的形式进入到黄铁矿的晶格中替代Fe，As和Se呈类质同象形式替换S，Au是以纳米颗粒的形式均匀或不均匀的分布于不同产状的黄铁矿之中.邦布金矿床中的含金石英脉中三个不同世代的黄铁矿的Co/Ni比值均小于1，保存了围岩中黄铁矿的信息，显示出一种沉积或沉积改造成因.Au与As和Se具有明显的正相关关系，As和Se对Au的迁移及富集具有重要的作用.Abstract: The Bangbu deposit is the only large orogenic gold deposit that is being exploited with the highest degree of research in the Yurlung-Zangbo suture zone. In order to understand the source, transportation and precipitation of Au in the Bangbu deposit, in situ microanalysis technique was used to obtain the trace elements compositions of Au-bearing pyrite from different generations. In situ trace elements results show that the siderophile elements Co and Ni mainly enter the lattice of pyrite to substitute Fe while As and Se substitute S in the form of isomorphism. Gold is distributed evenly in different generations of pyrite in the form of nanoparticles. The Co/Ni ratios of pyrite from three generations of Au-bearing quartz veins are all less than 1 which preserve the information of pyrite of the surrounding rocks indicating a kind of sedimentation or sedimentation-reformation origin. As and Se play important roles in the migration and accumulation of Au as Au has obvious positive correlation with As and Se.
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Key words:
- In situ trace elements /
- pyrite /
- Bangbu gold deposit /
- Yurlung-Zangbo suture zone /
- deposits
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图 1 青藏高原造山型金成矿带简图(a)、邦布金矿矿区地质简图(b)及Ⅲ号矿体素描图(c)
a图据侯增谦和王二七（2008）改编；b图据Pei et al.（2016）；c图据Sun et al.（2016）
Fig. 1. Geological map of the orogenic Au belts in the Tibetan Plateau (a), Bangbu gold deposit (b) and map of Ⅲ orebody (c)
图 2 邦布金矿蚀变及矿化期次
a和b.朗杰学群千枚岩，发生了黄铁绢英岩化；c.早期钩状石英脉，随地层发生褶皱变形；d和e.含金石英脉，穿切千枚岩地层；f.后期陡立状石英脉，沿南北向张性裂隙贯入，穿切钩状石英脉和含金石英脉
Fig. 2. Photographs of alteration and mineralization in Bangbu deposit
图 3 邦布金矿成矿阶段划分及不同世代黄铁矿照片
a.石英-粗粒硫化物阶段；b.细粒硫化物脉穿切石英-粗粒硫化物脉；c.碳酸盐脉穿切石英硫化物脉；d.胶黄铁矿脉穿切碳酸盐脉；e.第1世代黄铁矿，形成于石英-粗粒硫化物阶段；f和g.第2世代黄铁矿，形成于金-细粒硫化物阶段；h.第3世代黄铁矿，形成于胶黄铁矿阶段
Fig. 3. Photographs of metallogenic stages and pyrite in different generations at Bangbu deposit
图 4 邦布金矿床黄铁矿微量元素关系
Fig. 4. Correlation of selected major and trace elements in pyrite from the Bangbu gold deposit
图 5 邦布金矿床黄铁矿Co-Ni成因图解
底图据赵振华等(1987)
Fig. 5. Correlation of Co and Ni in pyrite from the Bangbu gold deposit
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