一、前言我国华南地区的产铀岩体绝大部分为燕山期花岗岩,这些岩体与其中铀矿化的形成年龄一般比较接近。近年来,我们对某岩体及产于其中的铀矿化作了研究,查明岩体是花岗岩化的产物,形成于760百万年,而铀矿床的年龄则为47百万年,成岩和成矿时差竟长达700多百万年。对这类矿床的成因如果仍然沿用岩浆分异学说解释则是很难令人信服的。为了研究这 I. INTRODUCTION The vast majority of the uranium-bearing rock masses in southern China are Yanshanian granites. These rock masses are generally close to the formation age of uranium mineralization. In recent years, we have conducted a study of a rock mass and its uranium mineralization, and have ascertained that the rock mass is a product of granitization formed at 760 million years ago, with a uranium deposit age of 47 million years and diagenesis And the time difference of mineralization was as long as 700 million years. The origin of this type of deposit is difficult to convince if it is still interpreted according to magmatic differentiation. To study this