GEOCHEMISTRY AND PROSPECTING IMPLICATION OF THE MAFIC-ULTRAMAFIC ROCKS IN CHAJIAN ORE DISTRICT,JILIN PROVINCE

The Hongqiling nickel orefield is one of the main concentrated metallogenic regions of magmatic coppernickel sulfide deposits in China.The Chajian ore district is a significant component of the Hongqiling orefield.There occur more than 20 mafic-ultramafic rock bodies in the ore district,in which a few small copper-nickel deposits and mineralized bodies have been found.The characteristics of lithology,alteration and mineralization,macroelements,microelements and rare earth elements are analyzed.By comparisons of the characteristics between Hongqiling and Chajian ore districts,it is concluded that the mafic-ultramafic rocks are affinity,with common deposits of liquationinjection type.The hydrothermal fluid superimposition is the unique ore-forming character in the Chajian ore district.The prospect implications are decided with the analysis and comparison.