| 美国阿拉斯加红狗铅锌矿床地质特征及成矿模式 |
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| 引用本文： | 张辉,徐九华,成曦晖.美国阿拉斯加红狗铅锌矿床地质特征及成矿模式[J].地质通报,2015,34(6):1011-1025. |
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| 作者姓名： | 张辉 徐九华 成曦晖 |
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| 作者单位： | 北京科技大学资源工程系，北京100083 |
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| 基金项目： | 中国地质调查局项目(编号：1212010811029、1212011220911) |
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| 摘 要： | 美国阿拉斯加红狗(Red Dog)铅锌矿床为典型的喷流沉积型(SEDEX)或页岩容矿矿床,拥有世界上最丰富的锌储量。矿床赋存于石炭纪库纳组中。该地层由黑色富有机质的硅质泥岩和页岩组成,局部有大量的碳酸盐浊积岩。根据闪锌矿结构和成分变化,矿化可分为4个阶段:早期褐色闪锌矿阶段、黄褐色闪锌矿阶段、红褐色闪锌矿阶段和晚期棕褐色闪锌矿阶段,其中第2和第3阶段为主矿化阶段。成矿年代学及古地磁研究表明,矿化作用与库纳组沉积作用同时发生,且存在中生代热液叠加。矿床形成经历了4个沉积-热液成矿过程:未固结泥中重晶石和硫化物沉积、重晶石的热液重结晶和硫化物沉淀、重晶石和硫化物脉的形成并交代早期重晶石,以及晚期角砾岩-细粒石英和晚期棕褐色闪锌矿的形成。
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| 关 键 词： | 红狗铅锌矿床 矿石特征 成矿模式 |
Geological characteristics and metallogenic model of the Red Dog Pb-Zn deposit, Alaska, USA |
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| ZHANG Hui,XU Jiuhu,CHENG Xihui.Geological characteristics and metallogenic model of the Red Dog Pb-Zn deposit, Alaska, USA[J].Geologcal Bulletin OF China,2015,34(6):1011-1025. |
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| Authors: | ZHANG Hui XU Jiuhu CHENG Xihui |
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| Institution: | Department of Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Located in the De Long Mountains of the western Brooks Range, Alaska, USA, the Red Dog Pb-Zn deposit is a typical SEDEX (Sedimentary exhalative) or shale-hosted deposit and contains the largest reserves of zinc in the world. The ores are hosted in rocks of the Carboniferous Kuna Formation, which consists of black, organic-rich, siliceous mudstone and shale with locally abundant carbonate turbidites. The textural and compositional data for sphalerite suggest that the ore-forming process of the Red Dog Pb-Zn deposit consisted of four stages (the early brown sphalerite stage, yellow-brown sphalerite stage, red-brown sphalerite stage and late tan sphalerite stage) rather than comprising merely a single metallogenic event. Stage 2 and stage 3 seem to have been the main stages of mineralization. Mineralization was basically contemporaneous with the deposition of the Kuna Formation, together with the Mesozoic hydrothermal superimposition, as indicated by the isotope chronology and paleomagnetic studies. The formation of the ore deposit experienced four-stage sedimentary-hydrothermal process, i.e., deposition of barite and sulfides in unconsolidated muds; hydrothermal coarsening of barite and precipitation of sulfides; deposition of barite and sulfides in veins and replacement of preexisting barite; deposition of late breccias, fine-grained quartz and tan sphalerite. |
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| Keywords: | Red Dog Pb-Zn deposit ore characteristics metallogenic model |
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