中国北方第四系地下水同位素分层及其指示意义

陈宗宇; 张光辉; 聂振龙; 南云驹

中国北方第四系地下水同位素分层及其指示意义

1.
吉林大学地球科学学院，吉林长春 130026
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

基金项目:

国家自然科学基金项目 49871079

国土资源部科技专项计划项目 200010301

详细信息

作者简介:
陈宗宇（1963-），男，研究员，1986年毕业于长春地质学院水文地质及工程地质系，现为吉林大学博士研究生，从事地热及水文地质研究工作

中图分类号: P641.3;P597
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出版历程
- 收稿日期: 2001-04-13
- 刊出日期: 2002-01-25

Groundwater Isotopic Stratification and Its Implications in Northern China

1.
Collegeof Earth Sciences, Jilin University, Changchun 130026, China
2.
Instituteof Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China

摘要

摘要: 中国北方第四系地下水中的D, ¹⁸O, ³H和¹⁴C含量存在明显的分层现象, 这种现象与末次冰期以来的古气候变化有着较好的对应性, 反映了全新世和末次冰期气候条件的差别以及地下水不同的形成机制.深层地下水为晚更新世末次冰期时期形成, 其δ(D) 和δ(¹⁸O) 值与全新世补给形成的浅层地下水相比, 分别贫4× 10^-3~ 16× 10^-3和1× 10^-3~ 2× 10^-3, 说明末次冰期时期年均气温较低.古地下水中D和¹⁸O的大陆梯度与全新世以来地下水中的梯度基本相同, 说明在过去30000a来尽管气温发生变化, 但中国北方大陆的大气循环模式没有发生实质性的改变.地下水同位素分层现象反映了3种不同的补给机制及参与现代水循环程度.这些信息对大陆尺度上的水循环研究和地下水的可持续开发利用有着重要的意义.
- 地下水的同位素 /
- 古气候和古水文 /
- 补给机制 /
- 地下水可持续利用 /
- 中国北方
Abstract: The underground water compositions of δ(D), δ(¹⁸O), ³H and ¹⁴C are distinct in shallow and deep Quaternary aquifers in northern China and reflect differences in average paleoclimatic conditions between the Holocene and the last glacial period of Pleistocene. The recharge of the groundwater in deep confined aquifer during the last glacial period caused δ(D) and δ(¹⁸O) to deplete by 4×10^-3-16×10^-3 and 1×10^-3 -2×10^-3 when compared to shallow aquifer recharged in Holocene, which suggests that annual mean temperature was lower in the last glacial period than that in the Holocene. While the similarity of the continental gradient of δ(D) and δ(¹⁸O) found in old groundwater to that in Holocene suggests that atmospheric circulation may not have gone substantial changes over northern China for the past 30 000 years even though the temperature had changed. The fact that groundwater isotopic stratification implies three different recharge mechanisms and influence of modern hydrological circulation is very important for understanding the continental hydrological circulation and sustaining development for groundwater resources.
- isotope in groundwater /
- paleoclimate and paleohydrology /
- recharge mechanism /
- sustainable development for groundwater resources /
- northern China

HTML全文

图 1 地下水中δ(¹⁸O), δ(D) 和¹⁴C校正年龄的关系

河北平原部分数据引自张之淦等^[5]和刘存富等^[6]; 柴达木盆地数据和准噶尔盆地部分数据引自李文鹏等^[1]

Fig. 1. δ(¹⁸O) and δ(D) versus¹⁴C age in groundwater

下载: 全尺寸图片幻灯片

图 2 中国北方第四系地下水的δ(D) 和δ(¹⁸O) 的关系

Fig. 2. δ(D) versus δ(¹⁸O) in groundwater from northern China

下载: 全尺寸图片幻灯片

图 3 中国北方第四系地下水δ(D) 和δ(¹⁸O) 的大陆效应

Fig. 3. Continental effect of δ(D) and δ(¹⁸O) in groundwater from northern China

下载: 全尺寸图片幻灯片

表 1 地下水同位素测试结果

Table 1. Summary of isotopic compositions for groundwater in northern China

表 2 中国北方地下水同位素统计特征

Table 2. Statistical characteristics of isotopic compositions for groundwater in northern China

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