Geological Characteristics And Prospecting Direction Of The Dadakenwula Ag Polymetallic Deposit In The Northern Margin Of Qaidam Basin,Qinghai

The dada Ken Wu La Shan mining area is located in the northern margin of the Qaidam Basin.The Qaidam Basin and its adjacent areas are important parts of the Central Orogenic belt,with special basin-mountain tectonic framework and geodynamic background.The southern part of the northern Qaidam tectonic belt is the intertidal mountain ophiolite-island-arc volcanic belt.Maoniushan Formation strata and quartz diorite are developed in the mining area.The purpose of this paper is to deeply understand and study the metallogenic regularity,geological characteristics and quartz diorite rock mass characteristics in Dadakenwula Mountain area.By understanding the geological background,metallogenic geological environment,geological characteristics and geophysical and geochemical anomalies of the deposits,the distribution law,metallogenic types and ore-controlling factors of the deposits are analyzed,the metallogenic potential in the area is explored,and the metallogenic model is preliminarily established,and then the metallogenic prospects of the area are predicted,so as to develop the area for the next step.Qualitative ore prospecting provides reference.The author further considers that the ore bodies discovered on the surface of the Dadakenwulashan deposit are epithermal Pb-Zn-Ag deposits,but porphyry copper deposits may exist in the deep part of the deposit.The Dadakenwulashan diorite is a set of quasi-aluminous and weak peraluminous calc-alkaline type I granite with high K and low Na.Rare earth elements in the rocks show that the normalized curves of chondrites incline to the right,the heavy rare earth elements are horizontal and the light rare earth elements are enriched,but the negative Eu anomaly is not obvious and the magma differentiation is not high.The characteristics of the ratios of La/Ta(54.32-68.51),Sm/Nd(0.18-0.19)and Rb/Sr(0.11-0.19)indicate that the magma genesis of the rock body is characterized by crust-mantle contamination.According to tectonic discrimination,the Dadakenwulashan intrusion may be formed in the geodynamic background of subduction continental crust disintegration and mantle-derived magma underplating.Under the unified plate collision and compression tectonic system of the Central Orogenic Belt in the early Mesozoic,continental crust subduction and disintegration occurred on the basis of the intertidal mountain ophiolite belt,and mantle-derived magma was induced.The underplating and partial melting of the lower crust are the emplacement of volcanic bodies to form the dada Ken Wu La rock mass.Based on the analysis of Dadakenwulashan ore deposit,this paper summarizes the characteristics of the prospecting indicators,such as lithology,alteration,magmatic rock,structure,geophysical and geochemical anomalies,etc.Based on the summary of the characteristics of the primary halo in the section,the analysis of the metallogenic stress and the alteration characteristics of the deep and surface,it is inferred that the deep part of the area has certain prospecting prospects.At the same time,deep prospects are likely to have porphyry type polymetallic deposits.It is believed that through further geological work,it is possible to obtain new prospecting breakthroughs and improve the prospects of mineral resources.