Intrusion Geochemistry And Metallogenic Prediction Of The Zhanbeicun And Erzhongdui In Greater Hinggan Mountains Heilongjiang Province

The Zhanbeicun and Erzhongdui of the Great Hinggan Mountains is located at the northern part of Linhai-Dawusu Cu-Pb-Zn-Au-Ag metallogenic sub-zone,which is loacated at the eastern part of the Chenbaerhhu-Genhe Cu-Mo-Pb-Zn-Ag-Au-Nonmetal metallogenic belt in the Pacific metallogenic field.The belt is generally covered with Yanshanian volcanic rocks,the output of the deposit is controlled by the northwest volcanic short-term and broken uplift?In this paper,we selected Zhanbeicun and Erzhongdui's intrusion as the research object to study the intrusion,based on the field geological mapping,the use of mineralogy,petrology,zircon U-Pb isotope dating,elemental geochemistry and water sediment measurement and other methods.The magma in the reserch area is strong and exposed to large areas.There are four type intrusion: coarse-mid grain admellite,mid-fine grain admellite,fine grain admellite(qtz),fine grain admellite.According to the U-Pb reserch,it shows the form age of the intrusion:coarse-mid grain admellite(216.1±1.7Ma),mid-fine grain admellite(150.5±1Ma),fine grain admellite(qtz)(142.1±1Ma),fine grain admellite(121.0±0.8Ma).They belong to the Late Triassic,Middle Jurassic,late Jurassic and Early Cretaceous.The geochemical data show that the magmatic rocks in this area have high silicon and high alkali characteristics,most of them are high potassium and alkaline series,and the different index is higher,which shows that the magmatic rocks undergo complete(full)crystallization differentiation.The enrichment of large ion elements Rb,Ba,Th,U,and the loss of high field strength elements Nb,Ta,Ti,shows that the source rock should belong to the shell source.The intrusion in the reserch area have the characteristics of magmatic arc.The Late Triassic intrusion is the A-type granite,which is formed by dehydration melting of the arc magma rise mixed with crustal material formed at the Mongolian-Okhotsk plate subduction period.The Middle Jurassic intrusive intrusion is I-type granite formed by the partial melting of the new crust in the process of closure of the Mongolian-Okhotsk subduction plate period.The Late Jurassic and Early Cretaceous intrusions are I-type and A-tyoe granites,which is formed by continuous thickening and deepening of the crustal lithosphere,and the hydrothermal mantle melted by melting,producing mafic magma,and the intrusive melting crust,after the closure of the Mongolian-Okhotsk subduction plate period.In the reserch area,the Pre-Mineralization elements is Cu,Pb,Mo,Au.The main anomalies are distributed in the Late Jurassic and Early Cretaceous intrusions.According to the geologic entity and drainage sediment anomaly,we delineate two B class 2 abnormalities,which is worth to do further work.