Research On The Geologic Features And Ore-controlling Structure Of Baishahe Lead Zinc Ore,Hongya County,Sichuan

According to the division of metallogenic belt,Baishahe lead zinc ore locates at Yantze Platform metallogenic province western margin Yingjing~ Hanyuan black area prospect Hayuan~Tuanbao Mountain lead zinc ore prospecting target.While according to geotectonics background,the lead zinc ore locates at a constituent part of Yantze Platform col and Mount Emei broken arch.It is adjoining to the north-south Luding-Miyi platform col of Kangdian Axis in west and Liangshan Mountain virgation in south.There are several lead zinc ores locating at this area,namely black area-snow area,Niuxin Mountain,Tuanbao Mountain,Wusi River,Great Eagle Rock,Laocao Gully,Huocao ground,Haizi gorunding,Tangjia,Baoxishui,and Yinchang Gully etc.And the lead zinc ore types of this area can be divided into three genetic types based on their different structural environments: 1.The “zinc-rich and lead-poor” stratiform and stratiform-like lead zinc ore body reserved at the crushed zones of second-stage top and third-stage bottom,and third-stage and fourth-stage of Dengying formation of upper Sinian system;2.The stratiform and stratiform-like lead zinc ore body reserved at the inter-stage crushed zone of Maidiping formation of lowerCambrian system;3.The “lead-rich and zinc-poor and silver-bearing” veined and crumby lead zinc ore body reserved at the the north-south or north-south-like fault structure of Dengying formation stratum of upper Sinian system of this area.This thesis,with the implementation works of “sifting project of Baishahe lead zinc ore,Hongya County,Sichuan Province” of 2014-2016 of Sichuan SANYAN Geological Survey Co.,Ltd as basics and the geologic features and ore forming backgrounds of the area and diggings as starting points,researches the relations of stratum,structure,magmation,and ore forming of the area and diggings.The ore-bearing and ore-reserving stratum,ore forming and reserving structure,wall rock alteration and magmation of the area and diggings are mainly researched and the ore forming condition is analyzed through the forming,evolution and development of geologic structure to discuss the time-space relationship between the Baishahe diggings structure and its ore forming.Then,the thesis concludes the geologic structure features,ore-forming and ore-reserving characteristics,wall rock alteration type,magmation and ore-forming effect of the area and diggings and integrates the research results of the lead zinc deposit of this area both at home and abroad to basically learn the geologic structure features,major ore-controlling factors,deposit-forming causes and types,ore-forming mechanism,rules and regulations of this deposit.See following for details:(1)It is basically recognized that the Baishahe lead zinc deposit of Hongya County is mainly controlled by stratum,structure and hydrothermal,and belongs to the typical deposition-hydrothermal filling-secondary reconstruction lead zinc ore of this area.(2)It is recognized that the Baishahe lead zinc ore comes through the diagenesis and ore-forming effects of three stages,namely deposition-diagenesis,later-stage transformation,and secondary oxidization.(3)It is recognized that the major structure ore-controlling types of the lead zinc ore are:(1)The ore-controlling type of inter-stage crushed zone;(2)The ore-controlling type at the compound position of secondary fault and inter-stage crushed zone;(3)The ore-controlling type of south-north-like secondary fault.Finally,the thesis provides theoretical basics for further mine production and ore prospecting of Baishahe lead zinc ore.