Geophysical and Geochemical Anomalous Features of Molybdenum Deposit in Zhunsujihua,Inner Mongolia and Its Geological Significance

The molybdenum deposit in Zhunsujihua of Sonid Zuoqi,Inner Mongolia,is a large deposit found during the recent years' geological survey in the Erlian-Dongwuqi metallogenic belt.The surface of this area is heavily covered,and the indication of ores is inconspicuous.Hence,the geophysical and geochemical methods have played a major role in the discovery and location of the molybdenum deposit.The geochemical prospecting shows that the ore-forming elements of Cu,Mo,Pb,Zn and Ag have formed three north-west direction abnormal combinations,coinciding with elements of W,Sn,Ni and Co,and have been deposited in a large area with complex components and have clear concentration features.The analysis of physical properties of rocks reveals that there are unambiguous differences between the ores and wall rocks.The high-precision magnetic measurements(1∶ 10,000) show that the granodiorite is magnetic,and the magnetic-abnormality region related to ore body are located.IP intermediate gradient measurements(1∶ 10,000) indicate that the ores have high charge-ability and low resistivity which are valuable information for mine exploration in this area.The geophysical and geochemical prospecting criteria for this deposit are summarized,and the metallogenic regularity are evaluated,which is an important clue to further prospecting work in the study area.