631矿床赋存在多期多阶段的花岗质杂岩体中,位于混合花岗岩与中粗粒斑状黑云母花岗岩的接触带上。矿体产在以钠质为主的碱交代岩体中,产状与碱交代岩相一致。631矿床的主要矿化类型是碱交代型,其矿石中的主要工业铀矿物为变生锆石。经电子探针分析,变生锆石中,铀含量为2.1％,锆为28.8％,而锆铀的分布与变生锆石的分布是一致的。 The 631 deposit is hosted in multi-stage and multi-stage granitic complex, which is located on the contact zone between mixed granite and medium-coarse-grained biotite granite. The ore body is produced in the alkali-substituted rock body which is mainly composed of sodium, and the occurrence is consistent with the alkali-metasomatism. The main mineralization type of the 631 deposit is alkali-based and the major industrial uranium mineral in its ore is metamorphic zircon. According to the electronic probe analysis, the contents of uranium and zircon are 2.1% and 28.8%, respectively. However, the distribution of zirconium and uranium is consistent with that of the altered zircon.