Study On The Characteristics Of Tectonic Ore-controlling And The Regular Of Lead-zinc Mine Ore-forming Fozichong Ore Fields In Guangxi

The Fozichong ore fields Pb-zn deposit on the border between southeast of Guangxi CenXi city and Cangwu county.It is one of the important large lead-zinc polymetallic ore field in south of our country. This paper Through to the detailed exploration of ore deposit underground and the identification under microscope in Fozichong Longwai. We think the structure of ore in mining area mainly block structure, disseminated structure, net vein structure and mixed structure. The mainly structure is the action by crystallization and metasomatism.Then it is the action of solid solution crystallization separation effect, recrystallization and pressure. At the same time the metallogenic period time can be divided into sedimentary diagenetic stage and fluid mineralization stage. Among them the hydrothermal mineralization period is the main period.According to the mineral assemblages. The ore-forming will be divided into four stages of mineralization.There are the stage of pyrite-quartz-calcite,the stage of sphalerite-galena-pyrite,the stage of pyrite-sphalerite-galena-chalcopyrite,the stage of quartz-calcite..And to determined the formation of mineral sequence is pyritel-sphalerite (chalcopyritel)-galena-pyrite2-chalcopyrite2.Fozichong ore fields has obvious ore-controlling features. North east fold controls the layered and layered deposits. North east to a great depth of fracture. Activity time is long. Is mine ore field guide rock conductivity fracture. North north east fracture is the north east fracture of secondary. It is RongYan fracture. It controls the late yanshanian granite porphyry intrusion and the distribution of the ore deposits (points). North west and north south fracture is the late breaking for ore fields. Will destroy the integrity of the rock and ore body. But individual fracture has become the scene of the late magmatic hydrothermal filling mineralization.Through to the study of buddhist blunt ore field of Fozichong. Combined with the analysis of ore deposit geochemical data. Consider the formation of the deposit more closely with the S1b-1、S1a、O3b、O2b-2formation、North east and north north east construct and rock mass of late yanshanian. It is the deposit which obviously controlled by the stratum lithology, structure and rock mass of the trinity of magmatic hydrothermal superimposed transformation. The formation of the ore field in time are divided into two phases. The first stage is Caledonian diagenetic period. The second stage is the late yanshanian magmatic invasion stage.