邵庄—双庙水源地不同水体U同位素组成特征的初步研究

Preliminary study on the component of Uranium isotopes in various water-bodies in Shaozhuang-Shuangmiao water source area

在邵庄—双庙水源地勘察评价过程中,应用U同位素场分析得到如下认识:(1)本区不同类型水体的U同位素具有不同的组成特征,主要表现为大气降水、山区岩溶水的U含量、I(234U)/I(238U)比值及Iex(234U)均较低;第四系孔隙水U含量和Iex(234U)均较高,但I(234U)/I(238U)比值较低;隐伏岩溶水的U含量较低,介于孔隙水与大气降水之间,而I(234U)/I(238U)比值与Iex(234U)均较高;地表水的U含量较高,但I(234U)/I(238U)比值低,Iex(234U)也较低;(2)蜀山背斜岩溶水系统具有大气降水、第四系孔隙水和深层岩溶水三源补给特征;(3)蜀山背斜岩溶水系统与双庙地垒岩溶水系统基本不存在水力联系,且二者补给条件也不同,蜀山背斜岩溶水系统与第四系孔隙水联系密切,接受上层孔隙水越流补给,径流条件好;双庙地垒岩溶水系统相对较封闭,与第四系孔隙水联系较弱,主要靠兖西奥灰水源地侧向径流补给,且径流条件相对较差。

The following point of view have been got by means of analyzing to the uranium isotope field during prospecting the Shaozhuang-Shuangmiao water source area. （1）The uranium isotope component is different in different water-bodies. In atmospheric water and karst water in karst hilly, the contents of U and Iex（^234U） and the ratio of I（^234U）/I（^238U）are relatively low; in crevice water of the Quaternary sediment, the contents of U and Iex（^234U）are relatively high, but the ratio of I（^234U）/I（^238U）is relatively low; in covered karst water, the contents of U is relatively low, but the ratio of I（^234U）/I（^238U）and the content of Iex（^234U） are relatively high; in surface water, the content of U is relatively high, but the ratio of I（^234U）/I（^238U）and the content of Iex（^234U） are relatively low. （2）The Shushan anticline karst water system is recharged by three kind of water, the atmospheric water, the crevice water of the Quaternary sediment and deep karst water. （3）There is no hydraulic connection between the Shushan anticline karst water system and the Shuangmiao horst karst water system, and the recharging conditions are different from each other. But, on one hand, the Shushan anticline karst water system, closely connected with the crevice water in the Quaternary sediment, is recharged by the crevice water in the Quaternary sediment and has good runoff condition and, on the other hand, the Shuangmiao horst karst water system, relatively sealed and weakly connected with the crevice water in the Quaternary sediment, is only receives lateral water recharge from the Aohui water source area in Yanxi region and has poor runoff condition.