| 云南墨江金矿多种类型角砾岩及其对深部找矿的指示意义 |
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| 关键词:breccia-type gold ores Mojiang (Jinchang) gold-nickel deposit volcanic breccia tectonic breccia |
| 基金项目:中国地质科学院矿产资源研究所基本科研业务费“墨江金矿床矿化蚀变分带特征研究及靶区优选”项目(编号: KK2118）； 中国地质调查局“中国矿产地质志”项目(编号: DD20221695; DD20221684) |
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| Various Types of Breccias and Their Implications for Deep Mineral Exploration in the Mojiang Gold Deposit, Yunnan Province |
| The Mojiang gold-nickel deposit in the Yunnan Province was identified through exploration efforts in the 1980s. However, after more than forty years of development and exploitation, the resources are becoming depletion. Through exploration and research in collaboration with the mining company, new breccia-type ores have been reidentified, generally showing high gold grades, reaching up to 12 g/t. The gold-bearing breccia can be classified into at least two types: tectonic and volcanic breccia. The tectonic breccia is located in the thrust zone between the Jinchang intrusive rock, the Lower Devonian Jinchang Formation, and the Upper Triassic Yiwanshui Formation. Volcanic breccia is found in the open pit and drill holes ZK74-52 and ZK76-9 of the Dishuikan section. The breccia-type gold orebodies are distributed near line 68 of the Dishuikan section and line 94 of the Maobiliangzi section. The breccia components mainly consist of siltstone, carbonaceous mudstone, and quartz, with sandy and mudstone cement. Gold mineralization also occurs in volcanic breccia, which have more complex compositions, including ultrabasic rocks, gray-white silicified siltstones, liver-colored quartz sandstones, serpentinite, and quartz. The matrix contains a ripped-up vitroclast and plastic shard. Volcanic breccia has been strongly affected by silicification and carbonation. The breccia components indicate that the volcanic breccia formed after the emplacement of the Jinchang intrusive rock and before the diagenesis of the red sandstone of the Upper Triassic Yiwanshui Formation. Identifying the distribution characteristics and genesis of breccia-type gold orebodies is crucial for increasing the reserves and production capacity of the Mojiang deposit. It also facilitates the exploration of new deep-level mineralization and opens up new prospects for mineral exploration. |
| ZHAO Chenhui,WANG Denghong,WANG Chenghui,LIU Shanbao,GUO Naxin,XU Jianxiang,FENG Wenjie,LI Wanping.2025.Various Types of Breccias and Their Implications for Deep Mineral Exploration in the Mojiang Gold Deposit, Yunnan Province[J].Acta Geoscientica Sinica,46(1):131-140. |
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