利用钍归一化法判断古地下水的迁移

为了需求古地下水的运移规律及对寻找矿床的作用，利用放射性元素钍稳定性的特点，建立了钍归一化判断的数学模型。其原理为；在自然界铀、钾与钍的含量在区域上有比较一致的比值，钍的主要化合物相当稳定，不易迁移，而铀酰离子、钾离子易溶于水，在古地下水的作用下使铀、钾与钍的比值发生了变化。本文以鄂尔多斯东胜地区的放射性数据为例，运用此模型分析迁移前后铀、钾的分布特点，从而判断出本区的古地下水运移规律，此结论与前地质工作者研究结果相吻合。因此，为研究古地下水运移开辟了一条全新的、简单的、高效的道路，从而对寻找其它矿床具有重大的理论和实际意义。

Judgment of movement of ancient underground water with normalization method of thorium data

To research the motion of the ancient underground water, the model of the normalization of thorium data is built based on the stability of thorium. Because both the ratio of thorium to uranium and kalium are comparatively steady regionally, the chemical compounds of thorium are quite steady and difficult to transfer. While the uranyl ion and the hydronium ion tend to dissolve in water, the effect of ancient underground water leads to the redistribution and movement of the elements of uranium and kalium, the ratio of thorium to uranium and kalium are changed. This paper puts forward thorium normalization model to renew the distribution of uranium and kalium before transference, the motion of the ancient underground water can be judged scientifically and correctly by using the motion rules before and after the transference. The radioactive data of Dongsheng region of Erdos basin were taken as a case to validate this model, the motion rule of the ancient underground water based on this model is the same as the result of the geologists by field work. Therefore, it will play an important role theoretically and practically in finding the ancient underground water and other mineral deposits.