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.
