Geological Characteristics And Genesis Of Lead-Zinc Polymetallic Deposit In The South Of Harizha,East Kunlun Mountains

The Harizha is located in the east section of the East Kunlun orogenic belt,belonging in Dulan County in Qinghai Province.The tectonic position is in eastern of the central Kunlun fault,and is between Neoproterozoic-Early Paleozoic suture in the central Kunlun fault and Neoproterozoic-Mesozoic sutures of Qimantage-Dulan in the northern Kunlun fault,It belongs to the East Kunlun metallogenic province and the Bogelike-Xiangride gold,lead and zinc,?copper,rare,rare earth?metallogenic belt of Indosininan period.The study of the deposit is relatively weak due to various reasons,Therefore,this paper intends to study the geological background,deposit geology,deposit geochemistry,etc in southern Harizha to clarify the source of ore-forming materials and the genetic types of deposits,In order to guide the field prospecting work,and promote the mineral resources exploration and development in the East Kunlun.Based on the previous studies,we are combining with survey and comprehensive research to make some achievements in the Harizha lead-zinc polymetallic deposit:1.The tectonic development of the lead-zinc polymetallic deposit in Harizha,as the main control structure of the north west to the secondary fracture,the ore bodies formed in the sb12,sb15,sb20 three structural alteration zones,and respectively Surrounded by the tonalite and the dacitic crystal tuff.in V and VI ore belt.2.The surrounding rock belongs to the strong peraluminous and high potassium calc-alkaline series.The tonalite have I and S type granite ingredients,and there is no obvious linear relationship between the main elements,indicating that the formation of the environment is relatively complex and the material has diverse sources;Those trace elements are enrichment in LILE as K,Rb,and lively incompatible elements as U,Th,but relatively depleted in HFSE?such as Nb,Ta,P,Ti?and Ba,Sr;The tonalite is rich in LREE but poor in HREE,with obviously negative Eu anomalies.3.There are two different forms of the mineral pyrite,the galore and the toxic ore,and the same mineral content is different,it indicates that the mineralization is multistage,and the arsenopyrite and the pyrite show better gold potentials by the EPMA.4.The U-Pb age of LA-ICP-MS zircon was 422.3 ± 1.9Ma for the tonalite,belonging to the late Silurian,The tectonic environment formed by the tonalite is roughly the collision-rear collision stage of the Caledonian tectonic cycle.5.The ?³⁴S_? value of each sulfide in the deposit is-2.375‰,it belongs to the deep magma hydrothermal,and the S in the formation of sulfide did not reach equilibrium;The Pb isotopic change is relatively stable,and shows that the dual source characteristics of the orogenic belt and the lower crust;So,It is believed that the metallogenic substance is mainly the partial melting of the lower crust and the mixing of the deep magmatic hydrothermal.6.The most of the mineralization temperature is 260?²80? in Harizha,It is presumed that the formation temperature of the deposit is low;Combining with the above results and geological conditions,it belongs to the intermediate-low temperature hydrothermal vein-type lead-zinc polymetallic deposit.