Metallogenic Regularity And Metallogenic Prognosis Of Gold Deposit In The East Kunlun Orogen,Qinghai Province

Located in northeast of the Tibetan Plateau,East Kunlun is one of the gold enrichment areas in China.There is strong tectonic-magmatic activity,superior metallogenetic conditions and good prospecting potential in East Kunlun,where a number of gold deposits(points)formed.In this paper,taking the tectono-magmatic-mineralization in East Kunlun as the main line of research,by systematic field observation and detailed laboratory study on the typical gold deposits and intermediate-acidic rocks related to gold mineralization,combined with isotopic chronology and geochemistry,I discuss the genesis and tectonic background of typical gold deposits,analyze the formation age and metallogenic material source of the gold deposits,and summarize the main ore-controlling factors of gold deposits in East Kunlun.According to the geological,geophysical and geochemical information,the regional prospecting model and the prospecting potential areas of gold deposits are established to provide basis for the next exploration and deployment.The main study contents and progress of this paper are as follows:1.The eastern Kunlun tectonic belt experienced a long and complex geological evolution process,such as the formation of ancient continent nucleus,continental breakup,subduction-collision and intracontinental extension.The tectonomagmatism in Late Paleozoic–Early Mesozoic is the main ore-controlling factor of the endogenetic metal such as gold mineralization in East Kunlun.2.Five diagenetic ages of intermediate-acidic rocks such as Asiha are obtained,which have important relationship with the gold deposits,and the metallogenic age data of Naomuhun gold deposit is also obtained.Systematically analyzing the relationship between intermediate-acidic rocks and mineralization,combined with the metallogenic ages which predecessors have obtained,the author considers that Indosinian is the main metallogenic epoch in East Kunlun.3.The deep-large faults in East Kunlun usually control the distribution of different types of sedimentary and magmatic formation,and also restrict the distribution of different types of mineralization and metallogenic belts.The secondary faults control the occurrence of gold deposits,and ore bodies often occur in the intersection of two or multiple sets of fracture.The shape,occurrence and scale of gold ore bodies are strictly controlled by the structure.4.Altered rock type and quartz vein type are two main types of gold deposits in East Kunlun.The spatial distribution of metallogenic belts,such as northern Kunlun,mid-Kunlun,southern Kunlun,A'nyemaqen and Bayan Har,are summarized systematically,studying the types,ore-forming elements association and difference of metallogenic temperature of gold deposits in different belts.5.The regional prospecting model of gold deposits in East Kunlun is established,the metallogenic prognosis is carried out and 27 metallogenic prospective areas are delineated,including A type 6,B type 8,C type 13,furthermore verified in the field.