Analysis And Metallogenic Prognosis About The Mineralization Systems In Yichun-Yanshou Metallogenic Belts, Heilongjiang Province

Metallogenic system is a new field of the study of mineral deposit at present. Mo-Cu-Pb-Zn–Fe-Au-Ag metallogenic system is a common hydrothermal deposit metallogenic system , and is the production of the same mineralizing fluid system with the time evolution or superposition of the different mineralizing fluid system over space. There are at least 27 polymetal deposits in Yichun-Yanshou metallogenic belt, which are the same production of Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system by comprehensive research. The system is divided into Mo-Cu-Pb-Zn , Cu-Pb-Zn–Fe and Pb- Zn–Au-Ag minerogenetic series.Mo-Cu-Pb-Zn minerogenetic series include Luming mineral deposit (porphyry types) which is the early production of Mo-Cu-Pb-Zn-Au-Ag metallogenic system. Cu-Pb-Zn–Fe metallogenic series include Xiao Xilin mineral deposit(skarn type) and Kun Lunqi (skarn types) which are the main productions of Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system. The epithermal types of Xinminbeishan is the late production of the metallogenic system that belongs to Pb-Zn-Au-Ag metallogenic series.Mo-Cu-Pb-Zn minerogenetic series are important types in Yichun-Yanshou metallogenic belt. Luming Mo-Cu mineral deposit and Cuihongshan Mo polymetal mineral deposit are models. Basic feature: Mo-Cu-Pb-Zn minerogenetic series are controlled by intermediate-acid～acid magmatic activities. The minerals of Luming Mo-Cu mineral deposit are produced by magmatite itself . The orebodies of Cuihongshan Mo polymetal mineral deposit accure in contact zones.They all lie in the middle and south of Yichun-Yanshou metallogenic belt . They are the early productions of Mo-Cu-Pb-Zn-Au-Ag metallogenic system. Cu-Pb-Zn–Fe metallogenic series which are the most important types of Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system. Most Pb-Zn mineral deposits belong to this type. Basic feature: Pb-Zn metallization are controlled by activities of contaminated remelting granite and granite porphyry. Orebodies of nervation,lenticular,capsular and veinlet-disseminated accure in contaminated granite,granite porphyry,syenogranite and contant zones of Qianshan group and Xiaojingou group of early Cambrian. Metallogenic rock type are contaminated granite and syenogranite. Hydrothermal ore forming solution come from magmatic. Distribution and output of mineral deposits are closely related to NE,NW,NWW fault. Mineralization is related to eopaleozoic strata. The models are Xiao Xilin Pb-Zn mineral deposit and Kun Lunqi Pb-Zn mineral deposit.Pb-Zn–Au-Ag metallogenic series are more important types of Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system.Xinmin Au-Ag mineral deposit is the model.Basic feature:Au,Ag are controlled by acid magmatic activities during yanshanian include granite porphyry incursion. Distribution and output of mineral deposits are closely related to NE,NW,NWW fault. Minerallization is controlled by strata in mesozoic era. Pb-Zn–Au-Ag metallogenic series which is the late productions of Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system distribute in the north of Yichun-Yanshou metallogenic belt.Metallogenic system of Mo-Cu-Pb-Zn-Fe-Au-Ag are controlled by special geotectonic environment and magmatic activity in mesozonic era. The polymetallic metallogenic stratums conditions are Qianshan group at Cambrain, Xiaojingou group at Ordorician, Fengshantun group at Triassic and Guanghua group at Cretaceous. The magmatic conditions are intermediate-acid magmatic activity. The northeast fault which developed at the joints of different secondary fold belts with their symbiotic northwest fault are formed of their structural conditions. The Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system is the coupling result of the metallogenic geological conditions.Synthetical researches suggest that the Mo,Cu,Pb,Zn,Fe,Au,Ag metallogenic elements have high intensity, and they formed superior ore species. The origin of polymetallic ore deposits are associated with the activity of granite magma. They showe as follows: Metallogenic series of each deposits are all magamtic hydrothermal types, volcanogene hydrothermal types (including epithermal types) or combined types of both of them. Mineralization become more and more complexed and metallogenic elements become more and more diversified with the simple to complicated evolution of magmatic components. The mineralization center transfers from early stage to later period.Through the study on Mo-Cu-Pb-Zn-Fe-Au-Ag metallogenic system of Yichun-Yanshou metallogenic belt, we established metallogenic systematic model and prospecting model for the research area in order to provide scientific basis for further research and forecasting for metallogeinc deposits.