湘西花垣铅锌矿田成矿模式  

Metallogenic model of Huayuan Pb-Zn ore field in the western Hunan Province,South China

作　　者：隗含涛[1,2] 邵拥军[1,2] 熊伊曲 刘伟 孔华[1,2] 李群[1,2] 隋志恒[2,3] WEI Hantao SHAO Yongjun XIONG Yiqu LIU Wei KONG Hua LI qun SUI Zhiheng(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China School of Geoscience and Info-Physics, Central South University, Changsha 410083, China 405 Geological Prospecting Party, Bureau of Geology and Mineral Exploration and Development of Hunan Province, Jishou 416099, China)

机构地区：[1]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,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]湖南省地质矿产开发局405队,湖南吉首416099

出　　处：《中南大学学报（自然科学版）》2017年第9期2402-2413,共12页Journal of Central South University:Science and Technology

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)~~

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。Huayuan Pb-Zn ore field is located in the transition zone between the southeastern margin of the Yangtze Block and the Xuefeng（Jiangnan） orogenic belt of South China. Ore bodies are mainly layered and secondly vein-like in shape, and hosted within both the algal limestone of the third submemeber and the sand limestone of the fourth submemeber of the Lower Cambrian Qingxudong Formation. Considering that faults and lithofacies are the most important ore-controlling factors for formation of the Pb-Zn orebodies, the characteristics of ore geology, isotope geochemistry, faults, lithofacies and ore source bed were analyzed. The metallogenic model of Huayuan Pb-Zn ore field was built. The results show that the sulfur is derived from the in-situ thermochemical reduction of sulfates from the older basement to the Cambrian sediments; the ore metals are likely derived from the older basement to the Shipai Formation,and the ore-forming fluids are mixture of metamorphic, formation and meteoric waters. The Huayuan—Zhangjiajie fault belt largely controls the distribution of sedimentary facies and mineralization, and the secondary faults with NE dip direction act as channels for migration of the ore-forming fluids. Moreover, the distribution of deposits and orebodies are controlled by shallow and biological reef facies near platform margins. Huayuan Pb-Zn ore field is MVT-type Pb-Zn deposit, which is formed in a foreland basin due to the Caledonian orogeny.

关 键 词：同位素 构造 岩相 矿源层 成矿模式 花垣铅锌矿田 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]