马洪云,李成柱,王化齐,郭莉.银川盆地水体氢氧稳定同位素特征分析[J].西北地质,2019,52(2):218-226
银川盆地水体氢氧稳定同位素特征分析
Hydrogen and Oxygen Isotopic Compositions of Water Bodies at Yinchuan Basin, China
投稿时间:2019-03-28  修订日期:2019-04-28
DOI:10.19751/j.cnki.61-1149/p.2019.02.023
中文关键词:  银川盆地;氢氧稳定同位素;水岩交互作用;蒸发混合作用
英文关键词:Yinchuan Basin;hydrogen and oxygen stable isotopes;water-rock interaction process;evaporation-mixing process
基金项目:中国地质调查局项目(DD20190296)
作者单位
马洪云 中国地质调查局西安地质调查中心/西北地质科技创新中心, 干旱半干旱区地下水与生态重点实验室, 陕西 西安 710054 
李成柱 中国地质调查局西安地质调查中心/西北地质科技创新中心, 干旱半干旱区地下水与生态重点实验室, 陕西 西安 710054 
王化齐 中国地质调查局西安地质调查中心/西北地质科技创新中心, 干旱半干旱区地下水与生态重点实验室, 陕西 西安 710054 
郭莉 中国地质调查局西安地质调查中心/西北地质科技创新中心, 干旱半干旱区地下水与生态重点实验室, 陕西 西安 710054 
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中文摘要:
      中国西北部银川盆地干旱少雨,大量的黄河水用于灌溉,灌溉入渗水对地下水循环的参与程度、参与深度研究是进一步解决灌区水环境问题和确定地下水污染来源的关键,需要深入研究。笔者通过氢氧稳定同位素特征分析和氚同位素年龄分析,构建了银川盆地不同水体同位素特征分布关系。结果表明:银川盆地降水和流经的黄河水的氢氧稳定同位素丰度均值都分布在全球雨水线上,降水和黄河水符合全球大气降水来源;深层地下水、浅层地下水及由地下水排泄汇集的排水沟水的氢氧稳定同位素都分布在地下水拟合线上(δD=8.24δ18O+1.08)。这条地下水拟合线与全球雨水线近似平行分布。两线之间的差异指向2种不同水循环的主导过程,即蒸发-混合主导过程和水岩交互-混合主导过程。两种解释对应的灌溉循环量分别占地下水排泄量的44.07%和89.76%,初步认为水岩交互-混合是地下水拟合线分布于全球雨水线下方的主导过程。
英文摘要:
      The Yinchuan Basin is an arid and semi-arid interior basin in northwest China, where a large amount of Yellow River water is used for irrigation. The study on the participation degree and depth of water seepage from irrigation to Groundwater circulation is a key to further solve the water environment problems. Based on the analysis isotopic characteristics of stable and tritium, the distribution relation of isotopic characteristics of different water bodies in Yinchuan basin has been constructed. It is shown that, the mean hydrogen and oxygen stable isotopes of precipitation and yellow river water are all distributed on the GMWL, indicating the characteristic of atmospheric sources. The stable isotopes of deep groundwater, shallow groundwater and drainage ditch water are distributed on the groundwater line (δD=8.24δ18O+1.08). This groundwater line is approximately parallel to the GMWL. The difference between these two lines points to two dominant processes of water cycles, the evaporation-mixing process and water-rock interaction-mixing process. These two processes indicate to two proportions of irrigation water in groundwater discharge, 44.07% and 89.76% respectively, which point out that water-rock interaction-mixing process is the dominant process.
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