矿床地质2012，Vol.31Issue(1)：94-110,17.
德兴铜厂斑岩铜矿脉体类型、分布规律及其对成矿的指示意义
Types and distribution of veins in Tongchang porphyry copper deposit,Dexing, Jiangxi Province
摘要
Abstract
The Dexing copper ore district is composed of Zhushahong, Tongchang and Fujiawu ore deposits. Based on systematic field observation of veins, the authors divided the veins in the Tongchang porphyry copper deposit into four types: A, B, D and H, which have recorded the evolution of ore fluids. The A-type veins related to primarily K-feldspathization are irregular and slighly mineralized, characterized by quartz ± K-feldspar ± biotite ± magnetite with minor pyrite and chalcopyrite; the B-type veins whose symmetrical pectinate quartz is vertical to the vein wall are enriched in chalcopyrite and molybdenite, related to hydrolysis of potassium silicate and characterized by quartz ± molybdenite ± chalcopyrite ± pyrite; the D-type veins related to sericitization are enriched in pyrite with sericite halos; the latest hypothermal H-type veins related to carbonatization are characterized by cal-cite + hematite ± pyrite + chalcopyrite. A statistical analysis of the thickness distribution of veins in the Tongchang porphyry copper deposit indicates that vein thickness data conform to the power-law distribution whereas the spatial distribution of veins follows a negative exponential law or a law between the negative exponential and log-normal. The fractal dimension D relative to the linkage of vein systems reflects the mineralization rate. The fractal dimension D (0.91 ~ 1.35) is high, which indicates poorly-connected systems and weak mineralization. The Cv coefficient (0.49 - 0.92) is low, which indicates a bad clustered organization of the veins and weak mineralization. The veins located in the clustering center as the function of channel ways for ore fluids are thicker and control the development of vein systems.关键词
地质学/脉体类型/脉体宽度/脉体间距/Cu-Mo矿化作用/斑岩铜矿/铜厂/德兴Key words
geology/vein type/vein thickness/vein spatial distribution/Cu-Mo mineralization/porphyry copper deposit/Dexing/Jiangxi Province分类
天文与地球科学引用本文复制引用
王翠云,李晓峰,肖荣,杨锋,王增科,朱小云..德兴铜厂斑岩铜矿脉体类型、分布规律及其对成矿的指示意义[J].矿床地质,2012,31(1):94-110,17.基金项目
本文得到国家自然科学基金项目(40872065)、中国科学院"百人计划"项目的资助 （40872065）
