江汉平原沙湖地区浅层含水层第四纪沉积环境演化

发布时间：2018-03-15 21:49

本文选题：江汉平原　切入点：沉积物　出处：《地球科学》2017年05期 　论文类型：期刊论文

【摘要】：地下含水介质是地球关键带的重要研究对象,为了拓展江汉平原地下水环境问题研究维度,综合应用~(14)C测年、δ~(13) C、铁价态以及沉积物溶解态有机质(dissolved organic matter,DOM)的光谱信息等重要环境指标,对沙湖地区近30ka的浅层含水层第四纪沉积环境演化特征进行了概化分析.沉积物中Zr/Rb、Rb/Sr比值以及δ13 C值表明,剖面在5~7m和16~18m范围相对其他深度更显暖湿气候特征;Fe~(3+)/Fe~~(2+)比值及沉积物颜色说明这两段暖湿期沉积物主要呈现还原环境.基于因子分析和DOM光谱信息可将沉积剖面的沉积环境演化概化为"近地表弱生物碎屑沉积单元"和"暖湿期强沉积单元"等5个单元.本沉积剖面所记录的沉积环境演化信息可为该区的地下水环境等相关问题的深入研究提供重要的背景支撑.
[Abstract]:The underground water-bearing medium is an important research object in the critical zone of the earth. In order to expand the dimension of groundwater environmental problems in Jianghan Plain, Some important environmental parameters, such as the spectral information of Fe valence state and dissolved organic matter in sediment, have been comprehensively applied to the dating, 未 ~ + ~ (13) C) and the dissolved organic matter of sediments, such as the spectral information of the dissolved organic matter in the sediment, and so on. The evolution characteristics of Quaternary sedimentary environment of shallow aquifer in Shahu area for nearly 30 ka are analyzed in this paper. The results show that the ratio of Zr / R _ (b) ~ (b) ~ (b) ~ (r) _ r and 未 ~ (13) C value in sediments indicate that, In the range of 5 ~ 7 m and 16 ~ (18 m), the warm and wet climatic characteristics are more obvious in the section than in the other depths. The ratio and the color of the sediment indicate that the sediments in these two sections are mainly reduced environment. Based on factor analysis and DOM spectral information, the sedimentary profile can be obtained. The evolution of sedimentary environment on the surface can be divided into five units, such as "weak bioclastic depositional unit near the surface" and "strong sedimentary unit in warm and wet period". The evolution information of sedimentary environment recorded in this sedimentary profile can be regarded as groundwater environment in this area. The in-depth study of related issues provides important background support.
【作者单位】：中国地质科学院水文地质环境地质研究所;河北省地下水污染机理与修复重点实验室;北京市地质环境监测总站;
【基金】：国家自然科学基金项目(No.41302187) 中国地质科学院基本科研业务费项目(Nos.YYWF201503,YYWF201726,YYWF201629)
【分类号】：P534.63;P641.6

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