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中生代以来的板块活动,使全球许多地方,出现了强烈的构造-岩浆活化,大地构造性质发生了变化,进入地洼发展阶段,这是一个巨大改造期,它具有一系列的地质构造基本特征,在成矿作用方面也有着自己的特色。以铀矿床为例,我们将成因上与中新生代活化过程有关的铀矿床,称之为地洼期铀矿床。这是全球最重要的铀成矿期之一。在国外,美国是最主要的铀资源国之一,目前有90％以上的铀矿储量赋存在砂岩型铀矿中,并广泛分布于
Since the Mesozoic, plate activities have led to intense tectonics in many parts of the world - magmatic activation and tectonic changes have taken place in the diwa stage of development, a period of great transformation with a series of basic tectonic features, In mineralization also has its own characteristics. Taking uranium deposits as an example, we will define the uranium deposit related to the process of Mesozoic and Cenozoic activation and call it a geologic depression uranium deposit. This is one of the most important uranium mineralization stages in the world. Abroad, the United States is one of the most important uranium resource countries. At present, over 90% of uranium reserves are present in sandstone-type uranium deposits and are widely distributed in