Geologic Characteristics Of Maogaitu Copper-molybdenum Deposit In Inner Mongolia

Maogaitu Copper-molybdenum Deposit is located in the metallogenic belt of southern GreaterHiggnanmountains.It is a new-found deposit that is of low study.Maogaitu Copper-molybdenum Deposit is focused on the Yanshanian granodio -rite,which putting up local mineralizing in this rock. The mineral veins and ore bodies is controlled by the fractures which are west-eastern in the mining site and distributed with right diagonal.Mineralization body alteration belts have been founded.and one of them has been checked by projects that there are 12 copper-molybdenum ore bodies in it.Copper-molybdenum ores major in the mineralized K-feldspar - quartz belt, granite- quartz belt.Showing the results of petrochemistry microelement geochemistry, the granodiorite which has genesis relationship with the deposit is of calc-alkalineseries.It belongs to M-type granite that is formed in island-arc circumstance which is between the ocean and the continent.Fluid inclusions research indicates that the deposit from the gas-liquid fluid inclusions composed of two-phase inclusions. The homogenization temperature is 178.9~236.1℃.The peak value is 170~200℃and 210~240℃.Liquid inclusions solinty is 1.05~40.8wt%(NaCl).The density is 0.82~0.89g/cm3.The estimating matallogentic pressure is 14.00~18.00MPa.The depth is 0.50~0.65km.To sum up,the formation of Maogaitu copper-molybdenum deposit relate to the subduction of Pacific Plate to the the Eurasian Plate.The hanging side of the Subduction zone is a extending circumstance of . island-arc or back-arc。In addition,the E-W Huolinghe River faulted zone coincides with the NNE Hundule River faulted zone in the granodiorite rock. Therefore the copper-molybdenum deposit of shallow-seated middle-low temperature hydrothermal origin is formed that relate to the granodiorite.