Research On Geological And Geochemical Features Of Pb-Zn Deposit In Luziyuan,Zhenkang, Yunnan Province

This paper is based on the predecessors’study which including characteristics of geology and geochemistry, metallogenic mechanism and metallogenic prediction in Luziyuan Pb-Zn deposit. According to the comprehensive analysis the Luziyuan Pb-Zn deposit of basic geological characteristics as well as different rocks’main elements, trace elements, rare earth elements and the fluid characteristics, and comparative analysis the typical lead-zinc deposits in the Baoshan-Zhenkang block, this paper concluded the following understanding:(1)Deposit is located in the core of Luziyuan secondary anticline, Zhenkang duplex anticline axis, southern part of Baoshan-Zhenkang block. The overall tectonic framework controlled by Zhenkang duplex anticline axis, on the basis of the Zhenkang duplex anticline, Luziyuan anticline, and a series of secondary NE, NW trending faults and related folds were generated, with regional tectonic evolution process, tectonic activity within the mining area showing a multi-stage activity, thus formed the current complex tectonic framework and it played a key role in space distribution, enrichment regularity and ore bodies emplacement and deformation of the lead-zinc deposit in the area.(2)According to the R cluster analysis, factor analysis and elemental composition analysis of each factor relations of major elements, trace elements standpoint of all kinds of rock and ore, systematic study of the geochemical characteristics of the deposit, and summarizes its geochemical enrichment and dispersion regularity, the relations of paragenetic assemblage, spatial distribution characteristics and genetic mechanism of main ore-forming elements and its associated elements.(3) All kinds of rock (ore) stone within the mining area are studied systematically with REE geochemistry, the chemical behavior of REE in the process of mineralization, the ore-forming material environment and source are discussed. The author thought the formation of the deposit experienced a low to medium-high temperature change, and its mineralization environment mainly occurs in the relatively reductive environment.(4)The fluid inclusions in sphalerite, quartz, calcite and fluorite of the Luziyuan Pb-Zn deposits of Zhenkang are composed of Pure liquid, gas-liquid and daughter mineral bearing inclusions. There are many fluid inclusions in the gangue and metallic minerals, on the hand, primary inclusions which often have a large area, groups of distribution; on the other hand, small amount of inclusions which are secondary inclusions tend to be linear arrangement distribution. The homogenization temperatures of fluid inclusions in these minerals range from160℃to320℃, and the salinities (NaCleq) of the inclusions range from1.7%to22.44%, The density of the ore-forming fluid of the inclusions range from0.809～0.984g/cm3, the pressure of the inclusions range from0.4-10.8MPa.(5)Comparative analysis the typical lead-zinc deposits in the Baoshan-Zhenkang block, The results show that, there are some obvious similarities in the geological characteristics, metallogenic regularity and genesis, etc.