Geochemical Characteristics Of The Old Basement Strata In The Dayaoshan Area Of Central Guangxi Zhuang Autonomous Region

The uplift and surrounding areas of the Da Yao Shan are one of the important sources of nonferrous metal deposits in Guangxi.Among them,gold,lead,zinc,tungsten and tin ore are especially rich,often distributed in clusters.The typical deposits are gogan gold deposit,peach blossom gold deposit,Wuxuan Panlong lead zinc deposit,xikateng lead zinc deposit and coral tungsten tin deposit.The old strata in this area are fully exposed and are exposed from Sinian,Cambrian,Ordovician and Silurian,and great thickness of shallow metamorphic strata developed in the area of the Yao mountain in the middle of Guangxi.The detailed study is conducive to a better understanding of the evolution process of the Da Yao Shan uplift and the enrichment and mineralization of elements.In this study,the control effect of Cambrian strata and perimeter rock mass on regional mineralization was found out in the Cambrian old basement and perimeter rock mass in the great Yao mountain area of Central Guangxi.This paper takes the area of Ping Tianshan,Xishan,Wuzhou,Fuzi Chong,Huashan and ghuashan area in the great Yao mountain long and adjacent areas as the research area.Through systematic sampling of the old strata and the surrounding rock mass in the study area,the samples are analyzed and analyzed by the constant elements,trace elements and hydrocarbon components,combined with the previous literature,so as to coordinate with the previous literature.The metallogenic theory is the guide,the law of enrichment and dilution,the geochemical characteristics of the typical magmatic rocks in the region and the types and distribution characteristics of the known minerals,and the metallogenic characteristics and the metallogenic potential of different regions in the region are clarified.The following conclusions are drawn:1.Through the analysis of the enrichment of the trace elements in the old basement of the great Yao mountain in the middle of Guangxi and the different regions in the periphery of the region,the mineral distribution in the area is considered to be related to the relationship between the enrichment of the elements in the old basement and the relation of the corresponding mineral relations.2.According to the geochemistry index of Clark value,concentration coefficient and change coefficient in this area,it shows that the old basement is still in the stage of original ore source layer during regional metamorphism,but not to the stage of ore source enrichment,and its mineralization mainly depends on large-scale rock slurry activity.3.The old basement features and element combinations in different sections are different,in which the southwest segment is W,Sn,Mo and Bi,and the middle part is Mo,Ag,Bi and Au elements,and the southeast is the combination of Pb,W,Cr,Mo,Au,etc.It shows that there are differences in metallogenic materials provided by different regions.4.The combination of the characteristic elements of the rock mass in the great Yao mountain uplift and the adjacent area is similar to the old basement elements in the corresponding area,which shows that they are also associated with the old basement in the corresponding areas.It is also related to the mineral base of the old base.5.Under the action of stratigraphic and magmatic rocks,the types of mineralization and the size of ore deposits are also different in the great Yao mountain uplift and adjacent areas.The main part is lead-zinc in the southwest section and gold in the middle,and the mainly gold,lead,zinc,tungsten and tin polymetals in the North and Southeast segments.