Investigation On Three Dimensional Model And Genesis Of Vanadium-titanium Magnetite In Chengde In Hebei Province

This paper takes Hebei Chengde Heishan vanadium-titanium magnetite as the research object,and collects and sorts the basic geological data of the Chengde Heishan vanadium-titanium magnetite deposit in Hebei Province,and discusses the regional stratigraphy,structure,magmatic rock and Heishan vanadium-titanium magnetite deposit.Geological features,in addition to Hebei Chengde Heishan vanadium-titanium magnetite as a prototype,based on the RDS system,based on geological data,exploration line profile,plane projection map and other geological data,established a detailed mine geological database,through geological interpretation,delineation the ore body constructs the geological entity model and block model of the mining area,quantitatively expresses the shape,occurrence,characteristics,interrelationship between the geological bodies and the degree of exploration control,and verifies the feasibility of applying the RDS system for reserve estimation.According to the electron probe data of vanadium-titanium magnetite ore,the ore-forming temperature of the deposit is calculated,and the oxygen isotope composition of ilmenite and magnetite and the sulfur isotope composition analysis of pyrite are summarized.Mineral source.The main results are as follows:?1?Through reading the geological data of the Heishan vanadium-titanium magnetite deposit in Chengde,Hebei Province,the stratigraphic,tectonic,magmatic and regional mineral characteristics of the area are summarized,and the geological features of the deposit,including the geological features,ore and mineral characteristics,are described.?2?The iron-phosphorus veins and sulfide magnetite veins interspersed in the plagioclase in the No.1 and No.II mining areas of the Heishan Iron Deposit have hydrothermal mineralization,indicating that the genesis of the Heishan iron deposit is different.It is believed that the magma crystallization,melting,and slurry penetration into mineralization also occur in the hydrothermal period.According to the characteristics of ore body geology,mineral symbiosis and ore structure,the ore-forming process of the Heishan iron deposit is divided into early magmatic mineralization stage and late hydrothermal mineralization stage.?3?Based on the geological report,section view and plane projection of the Heishan iron deposit,the author established the geological database of the black vanadium-titanium magnetite mine.Based on this,a three-dimensional geological model of the Montenegro vanadium-titanium magnetite deposit was established.It shows the spatial shape of the ore body in the ground well,and the reserve estimation results also have certain reliability.?4?The crystallization temperature of iron-titanium oxide in the hydrothermal ore-forming stage is between 300-500?,and the oxygen fugacity lgfO₂ is between-26.3—-31.2,which is low,indicating that it represents The final crystallization temperature of the hydrothermal titanium-titanium oxide after the magma period,that is,in addition to the magma origin of the predecessors,iron-titanium oxide and hydrothermal genesis.?5?Analysis of pyrite isotopes,ilmenite and magnetite oxygen isotope test results of lump iron ore,indicating that the source of ore-forming materials is deep and has the nature of mantle source.?6?The mechanism of hydrothermal mineralization may be:high temperature,high salinity,rich volatiles,promiscuous magma,hydrothermal dissolution of a large number of iron,phosphorus and other minerals,with mineralization,mineralization The fluid rises along the structural fractures,merges with the cold,low salinity atmospheric precipitation of shallow infiltration,and reacts with the surrounding rock.The temperature of the ore-forming fluid after mixing decreases and the salinity decreases,and the ability of the fluid to dissolve and transport the metal decreases,causing the precipitation of metal precipitates to form mineralization in the brittle fractures after consolidation of the labyrinthite.