Geological Characteristics And Diagenetic Age And Mineralization Age Of The Dongbulage Pb-Zn-Mo Deposit, Inner Mongolia,China

The Dongbulage Pb-Zn-Mo deposit ocuurring in Inner Mongolia is located in syncline wings of southwestern Harigentai compound Anticline in NE- NNE trending Xiwuqi early Paleozoic subduction zone inthe Xingan Mongolian orogenic belt.The deposit occurred in Bairendaba-Shabulengshan-Huaerbaote copper polymetallic mineralization belt in Great Xingan Mountains.The folds and faults which are advantaged formetallogenic of this area are developed, and this areais an important part of the Great Xingan Mountains southeastern margin mineralizing concentration area.The granite porphyryoccurred in this deposit area has the geochemical characteristics of high silicon, rich alkali, weakly peraluminous,which is similar to A-type granite,and it is belong to Crust-source rock.The adamelliteoccurred in this deposit area has the geochemical characteristics of Crust-Mantle mixed sourcerock,and it is similar to I-type granite.The rhyolite porphyryis alkaline in Si O2-AR(Alkalinity)diagram and is similar to S-type granite in K2O-Na2 O diagram.The rhyolite porphyry is belong to Crust-source rock.The flesh redgraniteoccurred in this deposit area has the geochemical characteristics of high silicon, rich alkali, peraluminous, which is similar to A-type granite, and it is belong to Crust-source rock.There may be two periods of magmatic activity in Dongbulage deposit area.The first period of time of magmatic activity is 164.2±2.7Ma ~ 160.9±2.9Ma,while the second period of time of magmatic activity is158.5±2.9 Ma~155.6±3.2 Ma.The Mo-mineralization in Dongbulage may be multi period mineralization. The first period of time of mineralization activity is 162.2Ma ~162.6Ma,while the second period of time of mineralization activity is 151.8±2.8 Ma.All of them belong to Jurassic,and two periods of mineralization activity may corresponded with magmatic activityperiods.