会泽超大型富锗银铅锌矿床矿化-蚀变分带规律及构造的控制作用

发布时间：2018-04-22 20:19

本文选题：矿化-蚀变分带规律 + 构造-蚀变-成矿　；参考：《中国地质》2017年02期

【摘要】：会泽超大型富锗银铅锌矿床是川—滇—黔铅锌多金属成矿区滇东北矿集区的典型代表。基于大量的地表调研和坑道精细编录,通过赋矿白云岩的岩石学、地球化学与矿化蚀变分带规律、构造对矿化-蚀变带控制作用的研究,认为赋矿粗晶白云岩是成矿过程中白云石化的产物,具有典型的热液蚀变成因,与沉积-成岩成因的摆佐组细晶白云岩、白云质灰岩明显不同;根据矿石和蚀变围岩中铅锌矿物组成与矿化、蚀变程度及其分布特征,该矿床矿化-蚀变分带规律:从矿体到围岩依次为铅锌矿石—铅锌矿化黄铁矿带→铅锌矿化/黄铁矿化粗晶白云岩带→灰白色粗晶白云岩带、米黄色粗晶白云岩带、肉红色粗晶白云岩带、网脉状白云石化灰岩带(蚀变残留体)、弱白云石化灰岩带。矿化-蚀变带明显受冲断褶皱构造(矿山厂、麒麟厂、银厂坡斜冲断层及其派生褶皱)上盘的层间断裂带控制,形成了典型的"成矿构造-蚀变白云岩-铅锌矿体"的矿化结构。该认识不仅丰富了会泽型(HZT)铅锌矿床成矿理论,而且对指导滇东北铅锌矿集区,乃至川滇黔成矿区的资源危机矿山的综合地质研究与找矿勘查具有重要的现实意义。
[Abstract]:Huize super large germanium-rich silver-lead-zinc deposit is a typical representative of Sichuan-Yunnan-Guizhou lead-zinc polymetallic ore-forming area in northeast Yunnan. Based on a large number of surface surveys and fine cataloguing of tunnels, the controlling effect of structure on mineralization-alteration zone is studied through petrology, geochemistry and mineralization alteration zoning of dolomite. It is considered that the coarse-grained dolomite is the product of dolomitization during the metallogenic process, and it has typical hydrothermal erosion cause, which is obviously different from the fine-grained dolomitic dolomite formed by sedimentation and diagenesis. According to the composition, mineralization, alteration degree and distribution characteristics of lead-zinc minerals in ore and altered surrounding rock, The regularity of mineralization-alteration zoning of the deposit: from orebody to surrounding rock, the order is lead-zinc ore-lead-zinc mineralized pyrite belt / pyrite coarse-grained dolomite belt, beige coarse grain dolomite belt, beige coarse crystal dolomite belt. The meat-red coarse grain dolomite belt, the reticulated dolomitization limestone belt (altered residual body), the weak dolomitization limestone belt. The mineralization-alteration zone is obviously controlled by the interlayer fault zone of the upper plate of the thrust fold structures (Kuanchang, Kirin Chang, Yinchang slope oblique thrust faults and their derived folds). A typical mineralized structure of "metallogenic tectonics-altered dolomite-lead-zinc orebody" was formed. This understanding not only enriches the metallogenic theory of Huize type HZT] lead-zinc deposits, but also has important practical significance for guiding the comprehensive geological research and prospecting of the resources crisis mines in northeastern Yunnan and even Sichuan, Yunnan and Guizhou metallogenic areas.
【作者单位】：昆明理工大学国土资源工程学院有色金属矿产地质调查中心西南地质调查所;云南驰宏锌锗股份有限公司;
【基金】：国家自然科学基金项目(41572060、U1133602) 云岭学者项目(2014) 国家危机矿山矿床成矿规律研究专项(20089943) 云南省矿产资源预测与评价工程实验室(2012) 云南省、昆明理工大学创新团队项目联合资助~~
【分类号】：P618.4;P618.52

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