| 安徽池州马头铜钼矿地质特征及蚀变分带 |
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| 引用本文： | 肖娥,马春,顾连兴,等.安徽池州马头铜钼矿地质特征及蚀变分带[J].地质学刊,2014,38(2):187-199. |
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| 作者姓名： | 肖娥 马春 顾连兴 等 |
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| 作者单位： | 江苏省有色金属华东地质勘查局 |
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| 基金项目： | 国家自然科学青年科学基金(41102036，41174103)，南京大学内生金属矿床成矿机制研究国家重点实验室开放研究基金 |
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| 摘 要： | 安徽池州马头铜钼矿是长江中下游成矿带中安庆—贵池矿集区内一个典型的铜钼矿床。通过野外地质祥查和系统的岩相学、矿相学工作,对该矿床的蚀变特征及分带进行了深入研究。识别出马头铜钼矿的蚀变类型主要有硅化、绢云母化、钾长石化,其次为黏土化、绿泥石化和碳酸盐化等。矿区围岩蚀变在空间上往往重叠,但具有一定的水平及垂向分带特征,自岩体深部至浅部、自内向外总体表现为面型石英钾长石化带、线型石英钾长石化带和石英绢云母化带。矿（化）体以脉状矿化为主,其中分布较广的石英脉带矿化主要产在石英绢云母化带中,以石英细（网）脉为主,受节理和裂隙控制;而品位较富的细脉浸染状矿化则主要产在面型钾长石化带中。通过研究认为,马头铜钼矿在成矿过程的早期阶段,由于高温、富钾和高pH值的热液流体作用,形成大面积的钾长石化,伴生与面型钾长石化有关的细脉、浸染状矿化;热液演化中期阶段,随着温度持续下降、K＋活度和流体pH值的降低,形成硅化、绢云母化等蚀变类型,并伴随范围较大的细脉-网脉状矿化;热液演化晚期阶段,主要形成碳酸盐化,而相应的矿化作用不显著。通过与部分典型斑岩型铜钼矿床的对比研究认为,马头铜钼矿在蚀变类型等方面与斑岩型铜钼矿大体相同,可归至斑岩型成矿体系。
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| 关 键 词： | 铜钼矿 岩相学 地质特征 蚀变分带 安徽池州 |
| 收稿时间： | 2013/10/30 0:00:00 |
| 修稿时间： | 2014/1/27 0:00:00 |
On geological properties and alteration zoning of Matou Cu Mo deposit in Chizhou in Anhui |
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| Institution: | XIAO E, MA Chun , GU Lian-xing, ZHONG Qing-lu, JIANG Nan-bo , LI Yan-bo(1. East China Geological Exploration Bureau of Nonferrous Metals in Jiangsu Province, Nanjing 210007, China; 2. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China) |
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| Abstract: | Matou Cu-Mo deposit was a typical Cu-Mo deposit in Anqing-Guichi ore district along the metallogenic zone of middle and lower Yangtze reaches. Through field work and lithology and mineragraphy analyses,the authors studied the alteration characteristics and zoning of the deposit,identified the main altered types for Matou Cu-Mo deposit were as follows： silicification,sericitization,potash feldspathization,and secondary clay,chloritization and carbonation. Ore mineralization was mainly vein mineralization,and quartz vein zone mineralization which was widely distributed and was mainly occurred in quartz sericite zone controlled by joints and fissures;other mineralization was veinlet mineralization of high grade was mainly occurred in facial potassic alteration. Through study,the authors acknowledged that during the early stage of Matou Cu-Mo ore formation,owing to hydrothermal fluid forces of high temperature,rich potassium and high pH value,potassic mineralization was formed and associated with veinlets and contaminated mineralization related with facial potassic alteration; during the middle stage of hydrothermal evolution,the alteration types were silicification and sericitization along with the decrease of temperature,K＋activity and pH value,accompanied by veinlets to net-vein mineralization of large area; during the late stage of hydrothermal evolution,carbonization was formed and related mineralization was not active. Through contrast study with some typical porphyry copper molybdenum deposit,the authors concluded that Matou Cu-Mo deposit was similar to porphyry Cu-Mo deposit in alteration types and could be attributed to porphyry metallogenic system. |
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| Keywords: | Cu-Mo deposit Lithology Geological properties Alteration zonation Chizhou Anhui |
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