云南景谷正兴铜铅锌多金属矿床地质特征及找矿标志

Geological Characteristics and Prospecting Indicators of Zhengxing Cu-Pb-Zn Polymetallic Deposit in Jinggu County,Yunnan Province

景谷正兴铜铅锌多金属矿床位于三江特提斯成矿区,兰坪—思茅Cu、Pb、Zn、Ag多金属成矿带,为一中—大型矿床。该区二叠系—白垩系有多组地层为Cu、Pb、Zn矿的形成提供了丰富的物质来源,主要的导矿构造为大文育—跑马田大断裂。首先结合相关地质工作成果,分析了区域地质背景、矿区地质特征及矿体地质特征,认为矿体主要赋存于二叠系地层中,其中,羊八寨组中的层状凝灰岩为区内铜矿重要的赋矿岩层之一,硅化、褐铁矿化与成矿有直接关系;然后通过对该矿床进行地质填图、槽探、钻探及物化探等工作,并结合区内矿产地质特征、物化探异常特征的综合分析结果,讨论了矿床控矿因素,认为该矿床应属受构造、地层、岩性联合控制的中—低温热液型铜铅锌多金属矿床。在上述分析的基础上,系统总结了矿床的构造、岩性、围岩蚀变、地球物理、地球化学等找矿标志,供区内进一步开展铜铅锌多金属矿找矿工作参考。

Zhengxing Cu-Pb-Zn polymetallic deposit in Jinggu County is lcoated in the Sanjiang tethyan metallogenic zone and the Lanping-Simao Cu-Pb-Zn polymetallic metallogenic belt, it is belongs to the middle-large size deposit. The ore-forming materials source of Cu, Pb and Zn deposits are provided by the multiple groups of strata in the Permian and Cretaceous, the Dawenyu-Paomatian faulted structure is the main ore-guide structure in the mining area. Firstly, combing with some related geological and explora- tion results, the regional geological background and the geological characteristics of the mining area are analyzed in detail,it is show that the ore-bodies are mainly existed in the Permian strata,the lamellar tuff of Yangbazhai group is considered as the one of most important ore-beating strata in the mining area, the relationship between silicide, limonite and mineralization is direct;then, geological mapping, trenching, drilling,geophysical and geochemical prospecting are conducted, and combing with the comprehensive study of the geological characteristics of the deposits and characteristics of geophysical and geochemical a- nomalies ,the ore-controlling factors of the deposit are discussed ,it is indicated that the genesis of the de- posit is belongs to middle-low temperature hydrothermal type Cu-Pb-Zn polymetallic deposit that is con- trolled by structure, strata and lithology. Based on the above analysis results, the prospecting indicators of the deposit are summarized from the aspects of structure, lithology, surrounding rock alteration, geophysical and geochemical. The above study results related to the geological characteristics and prospecting indica- tors of the Cu-Pb-Zn polymetallic deposit can provide some reference for the further prospecting work of the polymetallic in the mining area.