The Study Of Sedimentary Environment And Mineralization Of Yanwangdian Formation In Suiyang-Daohe Area,Heilongjiang Province

The study area is located in the Taipingling gold-copper polymetallic metallogenic belt.,we study theYanwangdian Formation through mineralogy and elemental geochemistry research method。According to the results,we make a primaryanalysis of the stratigraphic assemblage,lithofacies facies,source region characteristics and their mineralization。The lithology of the Yanwangdian Formation is black and mainlyconsistof phyllite,carbonaceous slate and mica quartz,and the whole is shallow metamorphism.The structure of the strata in the study area is small,Plates and glazes may provide a good place for enrichment of the formation elements.Based on the analysis of the main elements,trace elements and rare earth elements of the rocks,the rocks with high silicon aluminum and potassium rich characteristics are obtained.The Cu / Zn range is between 0.06 and 0.58,δCe < 1,indicating that the water is rich in Ce,rockslackof Ce,the deposition environment for the weak oxidation or reduction of environmental deposition environment,Ce showed weak negative anomalies,belonging to the normal shallow sea debris deposition.Using the main element,the metamorphic rocks in the area are discriminated by orthometamorphic and para metamorphic metamorphic rocks.The metamorphic rocks of thisformation belong to the para metamorphic rock rocks.The original rocks are sedimentary rocks.Associate with the geochemical elements of the rocks and their illustrations,the rocks main locate in sedimentary area.According to the K-Rb diagram,the rocks are cast in the acid source region,the main rock is mainly the source region of the evergreen material,which may be formed by the weathering of the medium-acid volcanic,The process of the upper crust of the ancient sediments to join;in different tectonic environment discrimination diagram,the vast majority of rocks fall into the active continental margin area.Geochemical characteristics indicate that the clastic rocks of the Yanwangdang Formation may be deposited in the active continental margin environment.The concentration of ICV is decreasing from the bottom to the top,and the weathering effect is from weak and to strong,and the maturity of the composition is gradually increased.According to its weathering characteristics,the climate of the source area is determined by the cold,dry and weak Weathered to warm,moist,medium weathering evolution.The mineralization elements Au,Ag,As,Sb,Pb,Bi,Hg,Zn and Cu are analyzed,and the enrichment coefficient of gold is 15.72,and the other elements are also rich butlackof Cu element.This formation can provide a favorable material source for the mineralization in this area,which may be the source bed.