中文摘要：

前期同位素水文地球化学的研究成果显示,关中盆地深部地下热水存在地质历史时期残余的沉积水,这直接关系到地热水资源的可持续开发利用。为此本文运用^36Cl测年法对其深层地下热水的年龄进行尝试性研究。^36Cl测年结果表明,关中盆地深层地热水最大的^36Cl年龄范围为988.69-1 123.98 ka,不同构造单元、不同热储封闭条件、不同成因类型的地下热水具有不同的^36Cl年龄。其中,文热4、渭热4两样点的^36Cl年龄分别为988.69-1 123.98 ka、675.69-809.77ka,在一定程度上分别代表了咸礼断阶和固市凹陷深层地热水的赋存年龄,提供了关中盆地残存沉积水的^36Cl年龄证据。由于这2个样点的地下热水仍存在一定量的入渗水混入,所以计算年龄小于实际年龄,此^36Cl测年结果应视为沉积水的下限年龄,估计关中盆地原始沉积水的年龄至少在百万年以上。

英文摘要：

There are abundant geothermal water resources in the deep reservoirs of the Guanzhong Basin,whose origin has been the focus of academic circles. Previous research results of the environmental isotope hydrogeochemistry showed that there was small amount of residual sedimentary water formed in the geological history in the deep geothermal water in the study area,which is directly related to the sustainable development and utilization of geothermal resources. This paper uses^36Cl to study the age of deep thermal groundwater. The results of^36Cl age show that the oldest age of deep groundwater in the Guanzhong Basin ranges from 988. 69 to1123. 98 ka. The geothermal water with different tectonic units,different closed conditions and different genetic types has different^36Cl age. The^36Cl age of the thermal water in wells Wenre 4 and Weire 4 varies between 988. 69- 1123. 98 ka and 675. 69- 809. 77 ka,respectively. To a certain extent,they represent the age of the geothermal water in the Xianli terrace and the Gushi depression,and they provide the evidence of^36Cl age that there is residual sedimentary water in the Guanzhong Basin. Although geothermal water of the two sample points is still the mixture of infiltrating water in different periods and different degrees. It indicates that the age of original sedimentary water in the Guanzhong Basin is more than one million years.