应用氚和_14_C方法确定柴达木盆地诺木洪地区地下水年龄.docx

应用氚和14 C方法确定柴达木盆地诺木洪地区地下水年龄峰1，2 ，崔亚莉1 ，张戈3 ，耿付强1 ，刘洁3刘( 1. 中国地质大学( 北京) 水资源与环境学院，北京100083;2. 中国地质科学院 水文地质环境地质研究所，河北 石家庄050061;3. 中国地质调查局 西安地质调查中心，陕西 西安710054)摘要: 以柴达木盆地的诺木洪为研究区，利用氚与14 C方法计算了当地各水体的年龄，分析地下水年龄分布特征及其可更新能力。结果表明: 山区至冲洪积扇中部地下水年龄为 15 ～ 18 a，为 1952 年之后补给的现代水，更新能力较强; 冲 洪积扇前缘地下水年龄不超过 2 ka，具有现代水与古水混合的特征，更新能力较差; 溢出带到盆地中心地下水年龄急 剧变老，变化范围为 5 ～ 28 ka，据此推测研究区溢出带位置的隐伏断层具阻水性质，该位置的地下水基本无更新能力。关键词: 柴达木盆地; 氚;中图分类号: P64114 C;地下水年龄文献标志码: A文章编号: 1000 － 8527( 2014) 06 － 1322 － 07Using the 3 H and 14 C Dating Methods to Calculate the Groundwater Agein Nuomuhong，Qaidam BasinLIU Feng1，2 ，CUI Ya-li1 ，ZHANG Ge3 ，GENG Fu-qiang1 ，LIU Jie3( 1. School of Water Ｒesources and Environment，China University of Geosciences，Beijing 100083，China;2. The Institute of Hydrogeology and Environment Geology，Chinese Academy of Geological Sciences，Shijiazhuang，Hebei 050061，China;3. Xian Center of Geological Survey，China Geological Survey，Xian，Shaanxi 710054，China)Abstract: By utilizing the 3 H and 14 C dating methods，this paper calculated the distribution of groundwater ageand then analyzed the groundwater renewability in the study area of Nuomuhong in Qaidam basin. The results show that: ( 1) in areas from the mountain to the middle part of the alluvial-proluvial fan，the groundwater age varies slightly ( 15 － 18 a) ，indicating that the groundwater is recharged after 1952 with a strong renewability;( 2) the groundwater age，in the leading edge of the alluvial-proluvial fan，is less than 2 ka，indicating that the groundwater is a mixture of the modern groundwater with the fossil groundwater and has a poor renewability;( 3) in areas from overflow zone to the center of the basin，the groundwater age gets older rapidly from 5 ka to28 ka，indicating that the hidden fault underlaid the overflow zone has the property of water blocking，and that groundwater in this area can be considered as unrenewable resources.Key words: Qaidam basin; 3 H;14 C;groundwater age大的冲洪积扇，是柴达木盆地中水文地质条件发育较为典型的地区之一。