四川张家坪子金矿床地质特征及成矿作用-兰州大学.PDF

兰州大学学报: 自然科学版, 2016, 52(6) / 12 月 Journal of Lanzhou University ：Natural Sciences，2016 ，52(6) / December 四川张家坪子金矿床地质特征及成矿作用 1 1 2 辛存林 , 包小强, 安国堡 1. 西北师范大学 地理与环境科学学院, 兰州 730070 2. 四川省核工业地质局 二八二大队, 四川 德阳 618000 摘 要：张家坪子金矿床位于冕西金矿集中区, 矿体赋存于中三叠统第三段第五层(T23-5) 的蚀变白 云岩及花岗斑岩脉中, 矿体与围岩成渐变过渡关系. 区内断裂控矿明显, 构造线主体为NNE 向, 张家 坪子韧性剪切带是该金矿床惟一的成矿-容矿构造, 严格控制着金矿床的形成和矿体的产出. 通过 C、O、H 、S 稳定同位素及流体包裹体的研究, 认为该矿床成矿热液以变质水为主, 并有部分岩浆水, 金成矿物质主要来源于地幔, 主成矿期为25 Ma; 主成矿期成矿温度峰值集中于200~280 ℃, 其成矿 深度峰值主要集中在1.5~2.4 km, 属于浅成低温热液型金矿床. 关键词：金矿床地质特征; 流体包裹体; 成矿作用; 张家坪子金矿床 中图分类号：Q142 文献标识码：A 文章编号: 0455-2059(2016)06-0713-09 DOI: 10.13885/j.issn.0455-2059.2016.06.001 Geological characteristics and metallogenesis of Zhangjiapingzi gold deposit in Sichuan Province 1 1 2 Xin Cun-lin , Bao Xiao-qiang , An Guo-bao 1. School of Geography and Environmental Sciences, Northwest Normal University, Lanzhou 730070, China 2. No. 282 Geological Party, Sichuan Bureau of Geology for Nuclear Industry, Deyang 618000, Sichuan, China Abstract: Zhangjiapingzi gold deposit is located in the West Mianning county gold concentration area and the ore bodies are hosted in the middle Triassic fifth layer (T23-5) near the metasomatism of dolomite and granite- porphyry dyke, with the dike having undergone mineralization, and the ore body and rock changed into a gradu- al transition relation. In the area the ore controlling fault is obvious and the outstanding tectonic direction is the NNE. Zhangjiapingzi shear schistosity alteration zone is the only host and ore-forming structure, strictly con- trolling the formation of gold ore deposit and the ore body output. Through the C, O, H, S stable isotope and