湘西花垣铅锌矿田成矿模式

发布时间：2018-05-10 11:59

本文选题：同位素 + 构造　；参考：《中南大学学报(自然科学版)》2017年09期

【摘要】：基于湘西花垣铅锌矿田位于扬子地块东南缘与雪峰(江南)造山带的过渡区,矿体主要呈层状和脉状赋存于清虚洞组下段第三、四亚段的藻灰岩中,构造和岩相是铅锌矿形成的关键控制因素,分析矿田地质特征、同位素地球化学、构造、岩相及矿源层等,并建立花垣铅锌矿田的成矿模式。研究结果表明:成矿硫来自板溪群马底驿组至寒武系地层中的硫酸盐的还原;铅锌来自板溪群马底驿组至寒武系下统石牌组地层;成矿流体为变质水、地层水和大气降水的混合流体;花垣—张家界断裂具明显的控相控矿特征,其派生的北东向雁列脉为流体运移的通道;台缘浅滩-生物礁相控制着矿床和矿体的分布。花垣铅锌矿田是在前陆盆地演化环境中受加里东构造运动影响而形成的MVT型铅锌矿床。
[Abstract]:Based on the fact that the Huayuan lead-zinc ore field in western Hunan is located in the transitional area between the southeast margin of the Yangtze block and the Xuefeng (Jiangnan) orogenic belt, the orebody mainly occurs in the algal limestone of the third and fourth submember of the Qingxuetong formation. Structure and lithofacies are the key controlling factors of lead-zinc ore formation. The geological characteristics, isotopic geochemistry, structure, lithofacies and source bed of the ore field are analyzed, and the metallogenic model of Huayuan lead-zinc ore field is established. The results show that the ore-forming sulfur comes from the reduction of sulfate from Madiyi formation to Cambrian formation of Banxi Group, the lead and zinc from Madiyi formation of Banxi Group to Shipai formation of Lower Cambrian, and the ore-forming fluid is metamorphic water. The fault of Huayuanyuan-Zhangjiajie is characterized by controlled facies and ore-controlling, and its derived NE Yanlie vein is the channel of fluid migration, and the platform margin shoal-reef facies control the distribution of the deposit and orebody. Huayuan lead-zinc ore field is a MVT type lead-zinc deposit formed by Caledonian tectonic movement in the evolutional environment of Foreland basin.
【作者单位】：中南大学有色金属成矿预测与地质环境监测教育部重点实验室;中南大学地球科学与信息物理学院;湖南省地质矿产开发局405队;
【基金】：中国地质调查局整装勘查项目(12120114052201) 中南大学“创新驱动计划”项目(2015CX008);中南大学博士生自主探索创新项目(2015zzts069)~~
【分类号】：P618.4

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