| 华北地下水古环境意义及古气候变化对地下水形成的影响 |
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| 引用本文：陈宗宇,张光辉,徐家明.1998.华北地下水古环境意义及古气候变化对地下水形成的影响[J].地球学报,19(4):338-345. |
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| 基金项目:地矿部重点基础项目 |
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| 中文摘要:华北地下水的同位素和化学组分受补给时期的气候影响指示了过去３．５万ａ的气候变化，其δ１８Ｏ的变化反映出了晚更新世向全新世转变时期的气候变化和晚更新世气温的波动；而在全新世则反映了夏季风带来丰沛降水的湿度变化。据地下水１４Ｃ年龄统计特征结合其它地质记录划分出了地下水的补给期。全新世以来对地下水补给有意义的补给期是６ｋａＢ．Ｐ．左右和４ｋａＢ．Ｐ．左右，而３ｋａＢ．Ｐ．左右地下水补给明显间断，钻孔土壤水ωＣｌ变化说明３ｋａＢ．Ｐ．左右气候干旱对地下水产生重要影响，可能是后期浅部水咸化的主要时期。 |
| 中文关键词:地下水 同位素 古气候记录 古补给期 |
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| Paleoclimate Record Deduced from Groundwater and Climate Change Implications of Groundwater Resources in North China |
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| Abstract:The isotopic and elemental compositions of groundwater are influenced by climate conditions at the time of recharge and therefore serve as indicators of climate change. The δ 18 O content of groundwater in North China Plain has recorded the regional climate changes during the last 35kaB.P., especially the has climate shift at the Pleistocene—Holocene transition.It indicates the cold — warm climatic change during the Pleistocene, and also shows the summer monsoon changes during the Holocene. According to the statistical distribution of groundwater 14 C dating , the paleorecharges are identified and the significant recharges for groundwater are about 6kaB.P. and 4kaB.P.. The chloride concentration of soil-water suggests that the dry climate about 3kaB.P. may be probably responsible for groundwater salinity. |
| keywords:ground water isotope paleoclimate record paleorecharge |
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