青海果可山地区钾长花岗岩地球化学特征及铀成矿条件

在系统研究果可山地区分布的钾长花岗岩地球化学特征的基础上，对区内铀成矿条件进行了分析，结果表明：①钾长花岗岩属高钾钙碱性系列岩石，A/CNK值均大于1.1，属典型的S型花岗岩；②稀土元素总量（不包括Y）平均1 047.30×10-6，总体显示含矿岩石稀土元素总量明显高于正常钾长花岗岩，轻重稀土元素总量比值为14.65~24.45，平均19.30，(La/Yb)N 23.01~8862，平均53.86，轻稀土元素富集明显，稀土元素配分曲线呈右倾型；③构造环境判别图解显示花岗岩形成的构造环境具有后造山花岗岩类特征，为造山带变形作用结束后形成的侵入岩；④钾长花岗岩地球化学特征与华南典型产铀岩体特征极为相似，成矿条件极为有利。

Geochemical Characteristics and Uranium Metallogenic Conditions of the Moyite in Guokeshan Area in Qinghai Province

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.