| 一个与火山碎屑岩和热液喷发有关的金矿床 |
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| 引用本文：刘 平，李沛刚，马 荣，韩忠华，杨光龙，叶德书.2006.A gold deposit associated with pyroclastic rock and hydrothermal exhalation：N ibao gold deposit in Guizhou Province, China[J].Mineral Deposits,25(1):101~110 |
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| 基金项目:国土资源大调查项目（200110200043） |
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| 中文摘要:泥堡金矿位于黔西南峨眉山玄武岩外缘的凝灰岩分布区，属微细浸染 型矿床。文章通过对泥堡矿床的地层、岩石、构造、矿体、矿石等实地调查和综合解析，探 讨其主要控矿因素和成矿作用，为今后寻找类似矿床提供参考和借鉴。研究结果表明，泥堡 矿床最主要的金矿体产于茅口组与峨眉山玄武岩组之间的沉积间断面附近，是一个集矿源层 、流体通道和容矿部位于一体的极具特色的成矿组合。在该区，P2_3β1_1 底部富含有机质的凝灰岩，P2_3β1_1与大厂石英岩之间的热液喷 发角砾岩，都是最主要的赋矿部位和容矿岩石。各种同位素和流体包裹体测试结果显示，黄 铁矿中的硫与玄武岩中的硫可能都来自幔源；富含SiO2和K的低盐度、中低温成矿流体是 地表水沿断裂深循环形成的；成矿时代属晚侏罗世（142 Ma），是黔西南地区最早形成的金 矿床之一。 |
| 中文关键词:地质学 火山碎屑岩 热液喷发 微细浸染型金矿床 泥堡 贵州 |
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| A gold deposit associated with pyroclastic rock and hydrothermal exhalation：N ibao gold deposit in Guizhou Province, China |
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| Abstract:Located in the tuff distribution area on the outer edge of Emeishan basalt in so uthwest Guizhou, the Nibao gold deposit is a fine_disseminated gold deposit. Bas ed on a field investigation and integrated analysis of strata, rocks, structures , ore bodies, and minerals, the authors probed into the major controlling facto rs and the ore_forming process, with the purpose of providing reference data for further ore_prospecting work. The results show that the main gold ore bodies we re produced near the interruption of sedimentation between Maokou Formation and Emeishan Basalt, which is a characteristic ore_forming combination composed of o re source bed, fluid passageway and ore_hosting space. There exist tuff with abu ndant organic materials at the bottom of P2_3β1_1 and hydrothe rmal exhalation breccias between P2_3β1_1 and Dachang quart z rock, which constitute main ore_containing space and ore_hosting rocks. The re sults of isotopic determinations suggest that the sulfur in pyrite and basalt ca me from the mantle, and the low salinity and intermediate_low temperature ore_fo rming fluids with rich SiO2 and K+ were formed by the circulation of atmosph eric water along the fissures. M ineralization took place in Late Jurassic (142 Ma). The deposit is one of the ea rliest_discovered gold deposits in southwest Guizhou. |
| keywords:geology, pyroclastic rock, hydrothermal exhalation, fine-dis seminated gold deposit, Nibao, Guizhou Province |
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