Petrological And Mineralogical Characteristics Of Fracture Zone Mineralization-alteration Area Of Sanshandao Gold Deposit,Jiaodong Peninsula,Eastern China

Jiaodong area is the largest gold concentration area in China,the ore deposit type is a structural altered rock gold deposit of magmatic medium mesothermal fluid.In the Sanshandao gold belt,in recent years,two super large gold deposits-the northern waters of gold(about 450 tons)and Xiling gold(about 350 tons)are finded,which the occurrence of gold deposits is closely related to the fracture alteration rock zone.I chose<Petrological And Mineralogical Characteristics of fracture zone mineralization-alteration area Of Sanshandao Gold Deposit,Jiaodong Peninsula,Eastern China> as the master's thesis,study the tectonic alteration mineralization law of the Sanshandao gold mine,which has certain significance for peripheral prospecting.This thesis has been supported by several research projects of Jiaodong gold mine,mainly there:National Science and technology support program "Integration and demonstration of geochemical prospecting method for deep prospecting in northwestern Jiaodong gold deposit",Shandong Gold Group scientific research project "Three dimensional study and deep prediction of the fault altered ore system in the eastern part of Linglong gold field" and "No.48,50 Linglong ore field comprehensive geological study and deep metallogenic prediction" et al.Scientific research project.Three field work studies were carried out in Jiaodong,and in the indoor system collation and identification analysis,abundant factual information was obtained,in particular,the core data of deep borehole in Sanshandao were systematically studied,From the perspective of quantitative observation of petrology and mineralogy,advance the study on the zoning of mineralization alteration in Jiaodong fault,.Completed a master's degree thesis,the main new knowledge and progress are as follows:1.Completed the mapping of the fracture structure and altered rock zoning of the-375 m middle hole and multi borehole.The study shows that the tectonic alteration zoning of the island is mainly divided into:Huang Tiejuan rock zone-Cataclastic rock zone-(Huang Tie)sericite granitic cataclastic rock zone-Strong potassic alteration zone-Weakly potassic two granite belt,this zoning can be well matched in the mid and borehole sections.Through the mid and borehole data analysis,the spatial distribution of tectonic alteration mineralization in the mining area has been reflected.2.The petrological and mineralogical markers of the fracture and mineralization alteration zone in the area of Sanshandao Gold Deposit are studied in depth.Through the research on the thin slice identification of typical drilling data in the SanShandao gold deposit,be knowable,Never altered granite to near fracture surface,The types of rocks are gradually changed from the medium and fine grained two granite and gabbro to granitic cataclastic rock,cataclastic rock,mylonite,Huang Tiejuan and so on.3.The mineral metasomatic profile of fault alteration zone is established.Based on geochemical analysis,Mineral content in mineralized alteration zone,From outside to inside,the content of feldspar increases first and then decreases,while the content of albite decreases,the content of calcium feldspar first stabilized and then decreased,while the content of quartz first stabilized and then increased,the results show that the alteration types are mainly the potassium mineralization,silicification,and pyritization-sericite formation,and further prove the accuracy of the alteration zone,and deepen the process of diagenesis and mineralization.