滇东北茂租铅锌矿矿床地质特征及成矿模式

Geological Characteristics and Metallogenic Model of Maozu Pb-Zn Deposit in Northeast Yunnan

滇东北铅锌矿集区位于扬子地块西南缘,成矿条件优越,茂租铅锌矿即是该成矿带上重要的铅锌矿床。通过详实的野外地质工作,并结合室内研究成果,对矿床地质特征及成矿模式进行了分析。结果表明:(1)茂租铅锌矿床位于扬子准地台滇东褶皱带,出露地层复杂,褶皱—断裂带发育,控制着区内铅锌矿床的产出;(2)矿床总体产于上震旦统灯影组白云岩中,沉积型矿化受控于地层,矿体规模较大,总体呈层状、似层状产出,脉状矿(化)体受控于褶皱构造及断裂构造;(3)矿床总体可划分为上、下2层矿化层,上层矿受控于原始沉积环境及岩性条件,下层矿受控于岩相岩性条件;(4)矿床成矿模式为“上层矿—下层矿—脉状矿”三位一体的热水沉积型,矿区构造交汇部位具有良好的找矿前景。

Northeast Yunnan lead-zinc deposit is located in Southwest section of Yangtze Block,which characterized by superior metallogenic conditions.The Maozu lead-zinc deposit is a significant leadzinc deposit in Northeast Yunnan metallogenic belt.Through the detailed field geological work and laboratory research results,the geological characteristics of the orebodies and metallogenic model are discussed.The results show that:(1)Maozu Pb-Zn Deposit is located in folding belts in East Yunnan of Yangtze Platform,which characterized by complicated emergence stratum,and the folded fault zone controlled the occurrence of lead-zinc deposit.(2)Maozu Pb-Zn Deposit is occurred in dolomite of Dengying Formation,Upper-Sinian.The sedimentary type mineralization are controlled by strata,which characterized by large-scale and stratiform occurrence.The vein ore are controlled by folded structure and fault structure.(3)Maozu Pb-Zn Deposit can be divided into two mineralized layers.The upper layer ore are mainly controlled by original sedimentary environment and stratum lithology,and the lower ore are controlled by lithology.(4)Generally,Maozu Pb-Zn Deposit is belongs to hot-water sedimentation-modified metallogenic model for three-in-one type"upper layer ore-lower layer ore-vein ore",and the intersection part of structures have favorable prospecting potential.