地浸砂岩型铀矿成矿年代学研究

本文提出用铀矿石样品U-Ra平衡系数修正样品的铀含量,再进行U-Pb等时线拟合,从而获得产铀盆地中地浸砂岩型铀矿的成矿年龄。通过对中国北方主要产铀盆地砂岩型铀矿成矿年代学研究,发现砂岩型铀矿的成矿作用具有“幕式”及多阶段性特征。不同构造单元的盆地铀成矿时代有差异,表明了铀的成矿作用与盆地构造抬升的演化历史及古气候关系密切。

Geochronogy of Leached Sandstone-type Uranium Deposits

This paper suggests a method in which the uranium contents of uranium ore samples are corrected with the U-Ra equilibrium coefficient, and then a U-Pb isochron is drawn. In this way, we can obtain the ages of leached sandstone-type uranium deposits in uranium-bearing sedimentary basins. From the geochronologic studies of sandstone-type uranium deposits, it is discovered that the ore-forming processes of sandstone-type uranium deposits are characterized by "episodes" and multi-stages. Various uranium ore-for-ming ages in sedimentary basins of different tectonic units indicate that uranium mineralization is closely related to the evolutionary history of tectonic lifting of basins and the ancient climate at that time.