Comparative Study On Geological Characteristics Of Kangding Gold Mine And Tianwan Gold Mine

The gold ore field of Kangding and Tianwan are the most important two ore fields in the Dadu river gold metallogenic belt,but it's influenced by the gold ore field of Kangding with the special geology environment,the level has been lower,in recent years has increased slightly,Tianwan gold field,time early,high degree of the study.In order to make clear the geological characteristics and genesis of the Kangding gold ore deposit,and the contact of Tianwan ore fields.In this paper,which is emphasis on the kangding gold mine field of typical deposits.on the basis of,the field geological investigation,indoor test analysis and comprehensive research,which form those aspect to study that are the ore deposit geological characteristics,ore deposit geochemistry and metallogenic epoch and so on.To compared the gold field basic characteristics between Kangding and Tianwan.On this basis,discussed the cause of Dadu river gold metallogenic belt.The research of ore deposit geological feature shows that the field of Kangding typical deposits respectively from Presinian system diamictite basement of Kangding and Neoproterozoic-Paleozoic sedimentary cover;Tianwan ore field is mainly produced in sedimentary cover dolomite of sinian system.Ore mineral composition is relatively simple,metal mineral are mainly metal sulfides,nonmetal minerals are mainly quartz;Mineral paragenetic combination: with strong similarity,the natural gold-polymetallic sulfide and pyrite-quartz type ore is given priority to,in addition,which also has a certain amount of telluride.On the ore-controlling structure,The ore field of Kangding and Tianwan are showing strongly similarity.The distribution of Ore deposit is strictly controlled by ductile brittle shear zone,the overall distribution and fracture structure trend are basic consistent,mainly to the north of north east,north of north west.The output of the ore bodies are controlled by the secondary shear zone and formation.Alteration of wall rock is Weak,pyritization and silicification is given priority to,all belong to hydrotherm alteration from medium to low temperature.In a study,gold ore-controlling structure in space of Kangding is shown as: basement is given priority to brittle-ductile or ductile brittle shear zone,cover layer is given priority to with brittle fracture zone;In time for the early brittle-ductile thrust,the late ductile-brittle stretching.Through chronology study found,the metallogenic epoch of Kangding gold field and Tianwan field are concentrated(15 ~ 20Ma),the mainly metallogenic epoch is the new generation Himalayan period.A small part of basal ore deposits metallogenic epoch is also distributed in 4~8Ma,36~40,48~50Ma,showed the characteristics of the multiple phase and multi-stage.The element geochemistry,isotope geochemistry and fluid inclusions of the gold field of Kangding and Tianwan comparative studies show that more than two smaller amount of rare earth elements change,REE distribution patterns show the right curve,belongs to the light rare earth element relative to the enrichment of heavy rare earth elements,negative Ce anomaly.Sulfur isotope characteristics feature showing,that kangding gold ore field is relatively stable,sulfur isotopic composition of higher homogenization degree;Tianwan gold sulfur isotopic composition of a bit complicated,but both ore field has the feature of mantle source of sulfur.According to the characteristics of quartz inclusions reveal that the uniform temperature concentrated in 130~280?,belongs to low temperature hydrotherm fluid.Hydrogen and oxygen isotopes show that the source of water in the metallogenic fluid is more complicated,overall which is characterized by a mixture of magma water,metamorphic water and atmospheric water.Through summarize the ore deposit characteristics of different bearing ore position in Kangding gold field,and compared with the characteristics of tianwan gold field,summarizes the similarities and differences of the gold ore field of Kangding and Tianwan,discussed metallogenic reason of Dadu river gold metallogenic belt.According to kangding and tianwan gold field metallogenic geologic features and element combination analysis,Dadu river gold belt belongs to the hypabyssal orogenic type gold deposits.