| 同位素指示的巴丹吉林沙漠南缘地下水补给来源 |
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| 引用本文： | 马金珠,黄天明,丁贞玉,W. M. Edmunds.同位素指示的巴丹吉林沙漠南缘地下水补给来源[J].地球科学进展,2007,22(9):922-930. |
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| 作者姓名： | 马金珠 黄天明 丁贞玉 W. M. Edmunds |
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| 作者单位： | 1. 兰州大学西部环境教育部重点实验室,甘肃,兰州,730000
2. Oxford Centre for Water Research,Oxford University,Oxford,OX1 3QY,UK |
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| 基金项目： | 国家自然科学基金
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教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 通过恢复巴丹吉林沙漠及其周边地区大气降水氚值，并结合区域稳定同位素组合特征，揭示了区域地下水氚年龄的多解性与地下水稳定同位素的温度效应。恢复的1963年核试验期氚高峰值达到2 100 TU，进入90年代平均为60 TU。1960年以来降水补给的地下水氚值都应大于15 TU，而1963年的高峰氚衰变至今应在200 TU左右。地下水实测氚值较低，表明由现代少量降水补给的地下水与大量的古水进行了混合。影响降水中δ18O和δ2H分布的主要影响因子是月平均空气温度，对δ18O与δ2H的影响权重分别占到59.9%和57.0%。巴丹吉林沙漠及其周边地区地下水较低的稳定同位素组成表明，其补给主要是晚更新世较冷环境下形成的，来源于东南部的雅布赖山区，部分浅层地下水接受现代降水与河流的补给。
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| 关 键 词： | 稳定同位素 氚值 地下水补给 巴丹吉林沙漠 |
| 文章编号： | 1001-8166（2007）09-0922-09 |
| 收稿时间： | 2007-04-30 |
| 修稿时间： | 2007-04-302007-07-05 |
Environmental Isotopes as the Indicators of the Groundwater Recharge in the South Badain Jaran Desert |
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| MA Jin-zhu,HUANG Tian-ming,DING Zhen-yu,W. M. Edmunds.Environmental Isotopes as the Indicators of the Groundwater Recharge in the South Badain Jaran Desert[J].Advance in Earth Sciences,2007,22(9):922-930. |
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| Authors: | MA Jin-zhu HUANG Tian-ming DING Zhen-yu W M Edmunds |
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| Institution: | 1.Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou 730000, China; 2.Oxford Centre for Water Research, Oxford University, Oxford，OX1 3QY, UK |
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| Abstract: | The reconstructed maximum tritium peak was reached 2 100 TU in 1963 in the Badain Jaran area，which is lower than the tritium peak value of 3 280 TU in Vienna, but quite higher than the average tritium value of 600 TU in HongKong. The reconstructed 3H value was about 110~150 TU during the 1970s and reduced to 60 TU during the 1990s.
The very low tritium value in the groundwater shows that little modern rainfall recharged groundwater was mixed by more palaeowater, which indicates age determinations accurate to the year are impossible and a tritium value in the groundwater means multiple recharge ages in this region.
The temperature is the primary factor effect to δ18O and δ2H in precipitation and their value is 59.9% and 57.0% respectively. The isotopic composition of the lakes and the shallow groundwaters feeding the lakes are interrelated along a line that intercepts the local meteoric line at around -11.4‰ δ18O . This implies that the groundwaters are genetically recharged from a time when the climate was much colder and wetter than today during the later Pleistocene. The source must be palaeowater from the Southeast Yabulai Mountain. However, the shallow groundwater partly recharged with minimum rainfall. |
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| Keywords: | Stable isotope Tritium Groundwater recharge Badain Jaran Desert |
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