关键词: 热液蚀变型铅锌矿床, 三江成矿带, 矿物生成顺序, 矿床成因, 找矿靶区

Abstract: Yanjiao-Niuluohe Pb-Zn Deposit in Yunnan Province is located in the southern part of the southwest Sanjiang metallogenic belt，the geotectonic location of the deposit is located in Pu'er-Jiangcheng depression basin of the southern part of Lanping-Simao Mesozoic depression basin of Tanggula-Sanjiang geosynclinal fold system，the orebodies are distributed in Jingxing Formation of Lower Cretaceous and Pingxiang Formation of Middle Jurassic Series.Combing with the geological working results of the region and mining area，the regional metallogenic geological background，geological characteristics of the mining area，orebody characteristics，ore characteristics，mineralization sequence and surrounding rock alteration characteristics are discussed，besides that，deposit genesis is analyzed.The study results show that:①the orebodies are filled in sandstone joints and fractures and structural fracture zones with the shapes of veins，reticulate veins and moniliform，the length of orebodies is 126~505 m，and the width of them is 0.4~29.01 m，the orebodies striking to south，the dip angle of them is 51°~80°；②the ore minerals are mainly for sphalerite，galena and pyrite，the gangue minerals are mainly for quartz，calcite and sericite，the ore structure is mainly for argillaceous fine sand structure，vein structure and disseminated structure are the main ore structural types；③the mineralization sequence can be divided into six stages，the first stage is tourmaline-kaolin stage，the second stage is quartz stage，the third stage is limonite-zircon stage，the fourth stage is cerusite-calcite stage，the fifth stage is lead-zine sulphide stage and the sixth stage is arsenopyrite-chalcopyrite stage；④from the center of surrounding rock alteration to outside is massive Pb-Zn mineralized zone，carbonization，tectonic breccia，ore-bearing net veins and veinlets，calcilization and quartzification，silicification，sericitization，pyritization and limonite alteration zone；⑤genesis of the deposit belongs to tectonical hydrothermal alteration Pb-Zn deposit.Based on the above study results and combing with the further geological prospecting results and geophysical working results of IP measurement and audio frequency magnetotelluric sounding，four prospecting target areas are delineated，they are named as JⅠ-1、JⅠ-2、JⅠ-3 and JⅠ-4.Metallogenic potential of JⅠ-1 and JⅠ-3 prospecting target areas are verified by drilling engineering，about 11.217 million tons of lead and zinc ores and 443 657 tons lead and zinc metals are obtained；prospecting potential of JⅠ-2、JⅠ-4 prospecting target areas are both good，where are the key regions for the further prospecting work.

Key words: Tectonical hydrothermal alteration Pb-Zn deposit, Sanjiang metallogenic belt, Mineralization sequence, Deposit genesis, Prospecting target area