GEOLOGICAL CHARACTERISTIS AND THE TIMING OF THE GOLD MINERALIZATION IN HADAMENGOU GOLD DEPOSIT, INNER MONGOLIA

Hademengou gold deposit in the western portion of the northen margin of the North China Craton, is hosted by the metamorphic rocks of the Wulashan Group with New Archaean age. The gold deposit is characterized by swarms of K feldspar quartz veins which occurred along nearly E W trending faults undergone ductile and brittle deformations. The potassic alteration is the strongest wall rock alteration around the orebodies. One sample collected from the potassic alteration rock immediately beside the orebody No.13 in Hademengou gold deposit has been analyzed using Sensitive High Resolution Ion Microprobe (SHRIMP) technique. The result shows that the mineralized polassic alleration rock formed at 132±2 Ma thus gold mineralization dating should be less than or approximate to 132±2 Ma, that is, the gold mineralization in Hademengou gold deposit took place during Late Yanshanian Period which is similar to gold mineralization in Jiaodong area, China.