【作者】 蔡鹤生； 鄢志华； 刘存富； 周爱国； 张俊刚； 李延河； 宋鹤彬；

【Author】 CAI Hesheng~1) YAN Zhihua~1) LIU Cunfu~1) ZHOU Aiguo~) ZHANG Jungang~1) LI Yanhe~2) SONG Hebin~2) 1)School of Environmental Studies,China University of Geosciences,Wuhan,Hubei,430074;2)Institute of Mineral Resources,CAGS,Beijing,100037

【机构】 中国地质大学环境学院； 中国地质科学院矿产资源研究所；

【摘要】 放射性衰变产生的氦组分（³H 衰变产生³He,U/Th 衰变产生⁴He）广泛地用于地下水测年。本文分析了地下水中惰性气体的组成,采用过剩空气非分馏（UA）模型进行了单独氦组分的分离。结果表明,河北平原第三含水组（Q₂）中的过剩⁴He是含水组内原地产量和深部地壳通量的共同作用的结果。由于缺乏确定氦平衡参数的约束很好的客观分析,选择应用地下水流模型主观调节来估算迭代过程中的外部通量和流速场,然后根据这个模型所取得的⁴He 年龄与应用其他方法包括¹⁴C 测年和水文模型取得的年龄进行了对比。更多还原

【Abstract】 Being very important,radiogenic components of helium（³He from ³H,⁴He from U/Th）have been extensively used forgroundwater dating.In this paper,the components of inert gases in groundwater were analyzed,and the separation of the individualhelium component was performed with the unfractionated excess air（UA）model.The excess ⁴He contained in third aquifer（Q₂）discussed in this study came from the in situ production of U/Th disintegration and the deep crustal flux.With no possibility of awell-constrained objective analysis of the parameters for determining the helium balance,the authors chose to estimate the externalflux and the velocity field in an iterative process by using subjective tuning of a groundwater flow model.The ⁴He ages obtained fromthis model were then contrasted with ages obtained from other methods including ¹⁴C dating and hydrological modeling.更多还原