摘要
本文根据28个样品的测试结果,介绍了河北平原地下水的^87Sr/^86Sr比值。水的^87Sr/^86Sr比值变化很大。这些Sr同位素组成的差别反映了平原中水流受区域地质条件控制。文中讨论了Sr同位素的6个分布特征。河北平原地下水的^87Sr/^86Sr比值均大于现代海水的平均值(0.709073)。平原内第四系地下水(Q4-Q1)从补给区到排泄区的^87Sr/^86Sr比值随着距离(年龄)增大而系统增大。水文学上年轻的水显示非放射性成因的(初始的)^87Sr/^86Sr比值,而较老的水则具有明显的放射成因,可达0.71527(δ^87Sr为8.74‰),这很可能是通过溶解含水层硅酸盐而增加大陆Sr的结果。
^87Sr/^86Sr ratios of 28 groundwater samples from an aquifer in Hebei plain are presented in this paper. The water exhibits highly variable ^87Sr/^86Sr ratios. The difference in Sr isotope composition reflects the regional geological control of water flow in the plain. Six distribution characteristics of Sr isotopes in groundwater are discussed. The ^87Sr/^86Sr ratios of groundwater in Hebei plain are higher than the ratio of modern mean sea water (^87Sr/^86Sr = 0. 709073). The groundwater from Quaternary sediments ( Q4 - Q1 ) in the plain shows a systematic increase in ^87Sr/^86Sr ratio with the increasing distance and age from the recharge area to the discharge area of the plain. Hydrological young water exhibits unradiogenic (initial) ^87Sr/^86Sr ratios, whereas older water is significantly more radiogenic, with the ^87Sr/^86Sr ratio rising to 0. 71527 (δ^87Sr = 8.74‰). This possibly results from the addition of continental Sr through dissolution of aquifer silicates.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2005年第B09期279-282,共4页
Acta Geoscientica Sinica
基金
本文由中国地质调查局地质调查专题研究项目(编号:2003201500002)资助.