The Research About Minerogenetic Series In The Middle Of Bangonghu-Nujiang Metallogenic Belt, Tibet

Minerogenetic series is the indispensable part in deposit research field. There are infrequently works and researches of minerogenetic series and mineralize on the midland along Bangonghu-Nujiang metallogenic belt in earlier times. According to theoretical basis, this paper is based on previous work, firstly made a comprehensive and systematic research of the genesis of this ore district. Bange County, Tibet, as the centre of researching district, three typical deposits had been found around Bange one after another. Such as Rina deposit; Gennai deposit; Xueru deposit are on the south, Shesuo deposit is on the west, Highly content of nickel ore deposits in Beila town and Darucuo LakeShore are on the north. Using analizying methods to describe the stratums; tectonics; magmatic rock; mineralizations; symbols of petrology; lanthanon; trace element; isotopes and diagenetic dating-ages. Deposits of skarn type are the leading types in semi-minerogenetic series. Shesuo is the dominant deposit. Diagenetic age and metallogenic age in Shesuo are 116Ma, date as late Yanshanian. Basite and ultrabasite deposits almost have the same diagenetic age. Iron deposit and nickel deposit formed in basite and ultrabasite rocks, copper deposits in this belt are related to neutral - medium acidic rocks. Mixed sulfur in the middle of the Stratigraphic sulfur is the main part as the sulfur source of skarn type ore deposits in this Metallogenic belt. Stratigraphic carbon, as the main source of the deposit, mixed with Magma carbon. Lead source is mainly from magma. Lead isotope are composited very homogeneous.Combining carbon, oxygen, lead, strontium isotopes and inclusions researches show that the ore-forming solution of skarn deposits derives from mixed magmatic water, in the later stage from atmospheric precipitation primarily. Diagenetic material sourcein terms of Shesuo deposit is Mix source type of granite series, which comes from silicon-aluminium crust or the lower crust.Basite and ultrabasite ore-rocks are from the upper-mantle of molted basaltic magma in the separation process of early crystallization, formed in the magma chamber bottom as the accumulations. Shesuo ore deposits is the formation of the deposit in low-temperature cable, as a result Ore-gas and Ore-forming fluid in low-temperature cause the interaction of the surrounding rock. The mineralization age of bismuth in the Bangong Co-Nujiang metallogenic belt should be the collision stage after the Southward subduction and closure of Yanshanian Bangong Co-Nujiang. All samples contained with Bi and In are identified that bismuth content of single samples meets the requirements of the industrial grade in the Bangong Co-Nujiang metallogenic belt. There are four bismuth minerals: Sulfur Bismuth copper ore, natural bismuth, copper bismuth lead sulfur, sulfur-Bi-Ag. There are also two indium minerals: Natural indium, Hydroxyl indium stone. The main existence forms of In is independent minerals. Above this, synthesize the relevant data to devide different minerogenetic series and semi-minerogenetic series in this ore district. Finally build the models to areally calculate the prospecting target areas including 2 mineral areas of highly content of nickel and 1 mineral areas of highly content of bismuth and indium.