A discussion on geological characteristics and comparison of regional mineralization of Yanjiao Pb-Zn deposit in Yunnan
  
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DOI:10.3969/j.issn.1671-4172.2019.01.015
KeyWord:Lanping-Simao basin; Ssedimentaryhydrothermal transformation; Lead-Zinc deposit
           
AuthorInstitution
ZHANG Quan1 (1. 云南驰宏锌锗股份有限公司,云南 曲靖 ; 2. 云南澜沧铅矿有限公司,云南 普洱 ; 3. 云南冶金资源股份有限公司,昆明 )
GUO Shizhao1 (1. 云南驰宏锌锗股份有限公司,云南 曲靖 ; 2. 云南澜沧铅矿有限公司,云南 普洱 ; 3. 云南冶金资源股份有限公司,昆明 )
YANG Jinbiao2 (1. 云南驰宏锌锗股份有限公司,云南 曲靖 ; 2. 云南澜沧铅矿有限公司,云南 普洱 ; 3. 云南冶金资源股份有限公司,昆明 )
WANG Daohui3 (1. 云南驰宏锌锗股份有限公司,云南 曲靖 ; 2. 云南澜沧铅矿有限公司,云南 普洱 ; 3. 云南冶金资源股份有限公司,昆明 )
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Abstract:
      Yanjiao Pb-Zn deposit is located in the Mesozoic-Cenozoic depression basin of Simao. The ore bodies are mainly hosted in the lower Cretaceous Jingxing Formation strata and sporadic small ore bodies are hosted in the HePingxiang Formation strata. The ore bodies are mainly veined and lenticular and controlled by faults. The ore-bearing lithology is yellowish-white, gray-white, yellowish-green powder-fine-grained, medium-grained quartz sandstone and lithic quartz sandstone. The metallic minerals in the ore are sphalerite, galena, pyrite, chalcopyrite and arsenopyrite. The main surrounding rock alteration is pyritization and calcification. The regional geochemical and petrochemical characteristics indicated that the Pb and Zn contents in the red beds (T-E) of the basinwere more abundant than those in the crustal Clark values, and the red beds in the basin may provide material sources for the Pb-Zn mineralization in this area. The metallogenic process was that in the early Cretaceous, accompanied by the sedimentation of clastic rocks, lead and zinc precipitated and enriched among the rock mineral grains, accompanied by the occurrence, development and deepening of the Himalayan tectonic movement, the deep hot brine and tectonic hydrothermal fluid migrated upward along the deep and large faults driven by the stress, and reacted with the rock beds. The Pb, Zn and other minerals in the strata were continuously extracted to form ore-forming hydrothermal fluid, which was mainly filled along faults and joints to form vein-like ore bodies with the same occurrence. Some ore fluids were superimposed on the low-grade ore bodies formed in the early stage to enrich them. The genetic type of deposit is sedimentary hydrothermal alteration deposit.
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