Genesis And Exploration Prospect Of The BoWu Porphyry Molybdenum Deposit In The East Kunlun Orogenic Belt

Porphyry-type molybdenum deposit is a kind of large-scale,low grade,disseminated and vein-disseminated deposit with close relationship with Medium-acid superficial-uper-hallow intrusion.Its reserves and extraction has a very important position in the world's total reserves and production.In recent years,the QinghaiInstitute of Geological Survey found a typical porphyry molybdenum polymetallicdeposit in the East Kunlun orogenic belt Laling stove area and also found molybdenum mineralization alteration in the southeastern direction of the mine,then startresearch around the Bo Wu intrusion.The area of the igneous rocks can be divided into granite,diorite rock,metamorphic rock.The molybdenite is mainly in the vein-like dyed plagioclase-like granite,Geochemical characteristics show thatthe magenta-like granite and the multi-speckle-like granite are a series of collapsible S-type granites.While the dark gray granite is a set of calcium alkaline granite,the granite composition is complex.The average of gray black granite porphyry Nb/Ta is 13.07×10-6,the maximum value is 15.26×10-6,Rb/Sr value of H9 sample is 0.19×10-6,H11 is 0.22×10-6.The ratio is between the mantle ratio and crustal ratio,the Zr/Hf ratio is much lower than the Zr/Hf ratio ofmantle-derived rocks,the overall characteristics of the rock are different from those of ore-bearing rocks.Porphyritic orthogranite and plesiophyric porphyritic granite are ore-bearing rock series in BoWu porphyry molybdenum deposit,it is S-type high alkali granites from melting crustal in continental collision,both of them have similar geochemistry and zircon U-Pb ages,Maybe they are homologous evolution.Thedifference in its structure is mainly due to the presence of different locations in themagma chamber.The weighted mean ages of LA-ICP-MS zircon U-Pb dating were 216.1±3.0Ma,216.1±2.4Ma.The collision happened at BoWu porphyry molybdenum deposit was about 222 Ma.There were two mineralization in the area,Once was the collision mineralization,about 222 Ma,That is,during the collision processdue to the subduction plate off the induced detachment,The molybdenite formed in this period is present in the form of disseminated form in the rock mass;another was the post-collision mineralization,this was the mainly mineralization,That is,the lithosphere caused by the demolition.After this research work,it is concluded that the BoWu porphyry molybdenum ore belongs to the deep-intrusive porphyry molybdenum deposit in the type of deposit,And experienced two molybdeniteaccumulation process,Prospecting potential is huge.