The Study On Metallogenic Structure Features And Metallogenic Prediction Of The Linjiawanzi Ore Section, Longjie Lead-zinc Mining Area In Yiliang County, Yunnan

This article takes Longjie lead-zinc ore district as the research object in Yunnan province ,Yiliang County, based on the research of the regional geological background, ore controlling structure, stratum lithology combination ore, ore-body location,etc, summarize the Metallogenic structure characteristics and metallogenic regularities of the Longjie lead-zinc deposit Linjiawanzi ore section, establishing ore-prospecting criteria. Then, with the Ore-controlling structure rules and metallogenic regularities,and the comprehensive of the geological, geophysical exploration, figure out the area(target) where is similar to the Linjiawanzi ore section.Through a lot of field geological investigation and indoor analysis, the research on the Longjie lead-zinc deposit Linjiawanzi ore section of the mineralization characteristics and metallogenic prediction is carried out and has made important achievements, mainly:(1)The research on the metallogenic factor and controlling factors for lead-zinc deposits shows that the metallogenic factors of lead and zinc in this place include stratum(D3), lithology (carbonate rock), structure(NW overthrust fault \NE cross fracture\fracture belt and anticline plunging end), wall rock alteration (pyritization, dolomitization, calcitization, iron dolomitization iron and manganese carbonate, silicate, etc.), eruptive, sediment environmentetc. Fracture is the most important controlling metallogeny factor and control factors for ore deposit by lithology precede over horizon.(2)Graduation controlling ore by the structure is obvious,namely area Xiaojiang River and Qujing - Zhaotong deep faults control the distribution of the ore belt tight folds-compacted folds and longitudinal fault growing from the core of compacted fold controls mineral deposit extent-the intersecting position of trunk fault and sub-fault and arch lean end in mineral deposit control mineral deposit and orebody attitude. Regional big fracture+sub-fracture+extrusion crush belt in stratum are good controlling ore system by structure and collecting, storage ore system. This dissertation firstly research all-sided ore-controlling mechanism by structures.(3) In the genesis, that Dragon Street lead-zinc deposit should be sedimentary hydrothermal reformed deposit. According to deposit the macroscopic characteristics, ore composition characteristics, mineral generation sequence reflects the characteristics of the deposit formation is a geological effect of the results, the formation process can be divided into sedimentary rock, hydrothermal mineralization stage and supergene oxidation period.(4) Metallogenic prediction: Combine with ore-controlling structures, alteration and geochemical anomalies information, we obtain four Prospect exploration districts, are as follows①Explosives depot to Maogou hole prospect district;②Haigu prospect district③Xiongjigu prospect area;④Xinshan prospect district. The result will be considered as the prospect district for engineering and geophysical exploration, as the basis for further exploration work carry out.