关键词: 铀矿, 钾长花岗岩, 地球化学特征, 成矿条件

Abstract: Based on analyzing the rock geochemical characteristics of the granite distributed in Guokeshan area in Qinghai province,the uranium metallogenic conditions of the area is also discussed.The results show that:①moyite in the area is belongs to the calcium alkali rock series with high potassium,the value of A/CNK is larger than 1,it also belongs to the typical S type granite;②the average value of rare earth elements (Y is not concluded) is 1 047.30×10-6，it overall show that the ore-bearing rare earth elements is higher than that of normal moyite significantly,the total ratio value of light and heavy rare earth elements is 14.65~24.45,the average value is 19.30,the value of (La/Yb)N is 23.01~8862,the average value is 53.86,the enrichment characteristics of light rare earth elements is significant,the rare earth elements partition type curve is appeared with the right type;③the tectonic environment discrimination diagram show that the tectonic environment of the formation of granite has the characteristics of after post orogenic granite,it is the one that is formed after the deformation process of orogenic belt;④the rock geochemical characteristics is consistent to the typical uranium-producing rock mass characteristics in the south of China,the uranium metallogenic conditions of the area is ideal.

Key words: Uranium deposit, Moyite, Geochemical characteristics, Metallogenic conditions