龙川江盆地团田地区砂岩型铀矿U-Ra平衡系数特征及其地质意义

Study on U-Ra equilibrium coefficient of sandstone type uranium deposits in Tuantian, Longchuanjiang basin

U-Ra平衡系数是评价铀镭平衡状态的重要参数,可以有效反映矿体中铀与镭溶解、迁移、富集状况以及指示地球化学环境、重建成矿作用,也是铀矿资源量修正不可或缺的参数。通过对龙川江盆地团田地区新获砂岩型铀矿矿段样品U-Ra平衡系数特征的研究,得出该地区芒棒组下段(N2m1)铀成矿作用持续进行直至近代、现代,矿段中铀存在富集叠加现象且成矿作用、后生改造作用存在多期次可能性等结论。

U-Ra equilibrium coefficient is the critical parameter in the evaluation of uranium and radium elements balance, which can not only reflect the dissolution, migration and concentration of uranium and radium elements in the ore body, but also indicate the geochemical environment and reconstruct the mineralization. In addition, it is an indispensable parameter of reserve correction of uranium deposits. By studying the characteristics of U-Ra equilibrium coefficient of ore samples in new-found sandstone type uranium deposits in the region of Tuantian, Longchuanjiang basin, it was concluded that the uranium metalization continued till the modern times in N2 m1 of Tuantian Region,Longchuanjiang basin. The uranium element in the ore block shows a continuous enrichment, and there are possibility of multi-period mineralization and the epigenetic transformation.