THE REGIONAL ORE-CONTROLLING CONDITIONS AND PREDICTION OF RESOURCES POTENTIAL OF THE DIAMOND CONCENTRATED DISTRICT IN WAFANGDIAN, LIAONING PROVINCE

Wafangdian area in Liaoning Province is a significant diamond concentrated district in China. The intrusion of kimberlitic magma is controlled by the deep translithospheric Tan-Lu fault. The NEE-trending faults formed by the posthumous movement of E-W-trending structure in the basement are favorable positions for the rock bodies. The combination of both structures controls the distribution of kimberlite rock bodies. Because of the different active strength of the NE fault, the kimberlite belts display a decreasing trend from north to south in the amount, scale and ore content of rock bodies. Based on this, it is concluded that there exists 1 or 2 kimberlite belts in Beiwawo-Songshuzhen. A great potential of primary diamond resources is predicted in this area. In addition, it is estimated about 30 million carat diamond formed in placer by denudation. Therefore, the diamond resources in Jurassic-Quaternary strata are also promising.