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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Occurrence, source and enrichment mechanism of silver in black shale-hosted Baiguoyuan Ag-V ore deposit, Hubei Province, China
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Occurrence, source and enrichment mechanism of silver in black shale-hosted Baiguoyuan Ag-V ore deposit, Hubei Province, China

机译：白银宿主白银院股份（湖北省）银中银源园AG-V矿床的发生

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摘要

The Baiguoyuan Ag-V ore deposit in Xingshan County, Hubei Province, is hosted in Neoproterozoic black shale, containing approximately 1860 tons Ag at average grade of 116 g/t and 21.8 Mt. V at average grade of 1.5%. The occurrence, source and enrichment mechanism of silver in this deposit are still a topic of debate. In this study, we applied high-resolution electron microprobe analysis (EMPA) and LA-ICP-MS technique to determine the occurrence of silver and to infer its source and enrichment mechanism. Mineralography observation revealed that pyrite is the main metallic mineral in the ores, which shows three-stage formation histories: (1) sedimentation, (2) diagenesis, and (3) deformation. BSE imaging detected tiny naumannite inclusions in pyrite. EMPA showed high contents of Ag in sedimentary pyrite. LA-ICP-MS analysis displayed both solid solution and tiny naumannite inclusion of Ag in pyrite. A mass balance calculation suggested that Ag occurred mainly as solid solution and minor as tiny naumannite inclusions in pyrite. The high contents of Co and Se, and high ratios of Co/Ni and Se/S in sedimentary pyrite indicated that Ag was probably supplied by submarine hydrothermal venting. The correlation between Ag and Fe or Se in sedimentary pyrite indicated that Ag was enriched through Ag and Se replacing Fe and S in pyrite, respectively.
机译：湖北省兴山县的Baiguoyuan Ag-V矿床托管在新典型古代黑色页岩，平均级别为116克/吨，平均级别为1.5％。本存款中银的发生，来源和富集机制仍然是辩论的主题。在本研究中，我们应用了高分辨率电子微探测分析（EMPA）和LA-ICP-MS技术来确定银的发生并推断其源和富集机制。矿物学观察显示，黄铁矿是矿石中的主要金属矿物质，其显示三阶段形成历史：（1）沉降，（2）成岩作用，（3）变形。 BSE成像在黄铁矿中检测到微小的Naumannite夹杂物。 EMPA在沉积黄铁矿中显示出高含量的AG。 La-ICP-MS分析显示了硫铁矿中Ag的固溶体和微小Naumannite包含。质量平衡计算表明，AG主要发生在硫铁矿中的固体溶液和次要的幼稚石夹杂物。 CO和Se的高含量和沉积黄铁矿中的CO / Ni和SE / S的高比率表明，AG可能由潜艇水热通风提供。沉积黄铁矿之间的Ag和Fe或Se之间的相关性表明Ag通过Ag和Se替代Fe和S中的富含硫铁矿。

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