| 确定平原地下水4He年龄方法的尝试 |
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| 引用本文：蔡鹤生,鄢志华,刘存富,周爱国,张俊刚,李延河,宋鹤彬.2005.确定平原地下水4He年龄方法的尝试[J].地球学报,26(z1):275-278. |
| DOI：10.3975/cagsb.2005.s1.90 |
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| 中文摘要:放射性衰变产生的氦组分（3H衰变质产生3He，U/Th衰变产生4He）广泛地用水地下水测年。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。 |
| 中文关键词:惰性气体 4He年龄 地下水河北平源 |
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| A Preliminary Study of 4He Age of GROUNDWATER; a Case Study of Hebei Plain |
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| Abstract:Being very important, radiogenic components of helium (3He from 3H, 4He from U/Th)have been extensively used for groundwater dating. In theis paper, the components of inert gases in groundwater were analyzed, and the separation of the individual helium 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 a well-constrained objective analysis of the parameters for determining the helium balance, the authors chose to estimate the external flux and the veocity field in an iterative process by using subjective tuning of a groundwater flow model. The 4He ages obtained from this model were then contrasted with ages obtained from other methodes including 14C dating and hydrological modeling. |
| keywords:inert gases 4He age groundwater Hebei plain |
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