云南蒙自市南斗冲铅锌矿地质地球化学特征及找矿方向

本文通过对南斗冲铅锌矿区区域地质背景、地层、构造、矿石组构等地质特征以及含矿建造地球化学特征的综合研究表明：南斗冲铅锌矿属构造控制的热液矿床，其成矿流体为沉积盆地中的热卤水经过循环溶解金属矿物形成的含矿热液，矿体主要赋存于岩石构造裂隙中，多形成含矿角砾岩、碎裂化粉晶-细晶白云岩。铅锌矿体分布在南斗冲向斜两翼，受断裂F5和F6控制，主要赋存于寒武系-奥陶系下统博菜田组第二段闪锌矿化碎裂化粉晶-细晶白云岩中。矿石矿物主要有硫化物、氧化物、硫酸盐等3种存在形式，其中主要为硫化物和氧化物矿物。寒武系-奥陶系下统博菜田组为滇东南地区新发现的铅锌矿赋矿层位，为下一步寻找铅锌矿提供了新的找矿方向。

Geochemical characteristics and prospecting direction of the Nandouchong lead zinc deposit in Mengzi City, Yunnan Province

This work is based on the comprehensive research of the geological characteristics of the Nandouchong lead-zinc deposit, including regional geological background, stratigraphy, tectonics, ore structure and geochemical characteristics of ore-bearing construction. Results show that this lead-zinc deposit is a structurally controlled hydrothermal deposit. The ore-forming fluid is the ore-bearing hydrothermal fluid produced by hot brine in a sedimentary basin through cyclic dissolution of metal minerals. The ore bodies mainly exist in rock cracks, mostly as ore-bearing breccia and fragmented powder crystal-fine-grained dolomite. The lead-zinc ore bodies are distributed in the two wings of the Nandouchong syncline, controlled by two faults, named F5 and F6, which occur in the fragmented dolomite in the second member of the Cambrian-Ordovician Lower Bocatian Formation. Ore minerals are present sulfides, oxides and sulfates, dominated by sulfides and oxide minerals. The Cambrian-Ordovician Lower Bogutian Formation is a newly discovered ore-bearing horizon in southeastern Yunnan, providing a new prospecting direction for the next step to find lead-zinc deposits.