Geological Characteristics And Prospecting Potential Evaluation Of Jinchanggou Copper-Molybdenum Deposit In Jidong County, Heilongjiang Province

Jinchanggou Cu-Mo Deposit lies in the east-northern section of the polymetallic mineralization belt of Taipingling upheaval. TmaiPingling metalgenetic belt is located in the volcano rock belt of the east of Chinese Northeast controlled by the active continental edge of the West Pacific Ocean,and its geostructural position is in the edge upheaval sector of Zhangguangcailing-Taipingling in theXingkai Lake-Bulieya mountain land parcel area.It is in the south-eastern side of Dunhua-Mishan deep-big fault.The Mesozoic volcano-subvolcano magmatic activity was extremely intense and formed the unique geologic structure environment.It is not only the polymetallic mineralization belt of Au,Cu and so on in the east of Chinese Northeast,but also one of the prospective area about polymetallic mineralization in the eastern area of Heilongjiang Province.Study is aimed at clarifying metallogenetic material origin,metallogenetic me- chanism and the genetic type of the deposit and establishing the synthetic prospecting signs and prospecting pattern through synthetically analysis the geological conditions etc. of the region ,the mining area and the deposit in order to lay foundation local geological prospecting work in the future.This article studied the metallogenetic material origin and metallogenetic mechanism and so on on the basis of synthetically analyzing the conditions of the ore-formingl geology,the conditions of physics and chemistry of Jinchanggou Cu-Mo deposit by using the analysis the of spectra of original rocks and metallogenetic fluid.It is believed that the many times activities of Dun-Mi deep-big fault in the Mesozoic not only controlled the volcano belts,the other directions'fault-structures and the volcanic break-fallen basins and so on but also provided the thermal resource,the material origin and power for later mineralizaion.The connective spots of the grown structures in this area not only controlled the blasting the structures of breccia tubes, but also provided the good channels and the concentrated places for the later fluid. The frequently active magma from the upper mantle carried the metallogenetic materials during its rising ,in the meantime activated and absorbed the metallogenetic elements from the strata of Yangmu group and Yangwangdian one, Huangsongqun.after the magma entered the superficial crust, the magma water including materials mixed with the atmospheric water to form the metallogenetic hydrthermal and continued to rise along structural fragmentation bands and formed the deposit in the most advantageous environment(the blasting breccia tubes).That is to say,the metallogenetic material origins have twe ways :1 From the upper mantle.According to the anaysis to the metallogenetic physical and chemical conditions,the metallogenetic fluid came from the upper mantle;2 from the strata of Yangmu group and Yangwangdian one, Huangsongqun.The content of the main metallogenetic elements such as Au,Ag,Cu,Mo and so on in quaurtz mica schist of the background field is twe times more than Clark value.The obvious impoverishment is discoverid through the anaysis to schist breccia and the wall rock of schist.These elements provided the richer materials for mineralization.By the research of the deposit'geological and so on,we may see the spacial state of the ore bodies.The copper ore bodies mainly concentrate on the schist breccia, breccia of granodiorite porphyry and their interfaces among the strata and the breccia tubes; The molybdennum ore bodies mainly lie in the breccia of granodiorite porphyry; The gold ore bodies mainly distribute in the breccia tubes'schist breccia and the fragmental bands.The ore bodies are generally controlled by the breccia tubes,the interfaces and alteration crushed zone.The ore bodies shapes generally take on the artery ones,the tubes ones and the lens ones and so on.Through synthetic study and contrast,it is believed that the type of Jinchanggou Cu-Mo deposit is a porphyry deposit.The rocks were mineralized with the intense alteration.The silicification and the alteration of pyrite are universally displayed in the ore area ,in the meanwhile,the alteration of serica(white serica) is associated with silicification ,in addition,with chloritization ,carbonation and limonte and so on.By the research of the geological and geochemical characteristics,the geophy- sical parameter features as well as the geophysical survey methods,the synthetic prospecting pattern and prospecting signs is established.This is very important to reasonably and scientifically choose the prospecting methods and techniques in order to better complete the prospecting task than before.On the basis of Jinchanggou Cu-Mo deposit'geological characteristics,metal- logenesis and the rigional metallogenetic features,the author believed that the new ore bodies can be discovered holefully through further work to increase the metal reserve and expand deposit scale.Meanwhile the potential of prospecing is very big in the related region.It is possible to discover the more porphyry deposits and other hydrothermal ones.