| 江汉平原沙湖地区浅层含水层第四纪沉积环境演化 |
| |
| 引用本文： | 王妍妍,黄爽兵,赵龙,易卿.江汉平原沙湖地区浅层含水层第四纪沉积环境演化[J].地球科学,2017,42(5):751-760. |
| |
| 作者姓名： | 王妍妍 黄爽兵 赵龙 易卿 |
| |
| 作者单位： | 1.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No.41302187中国地质科学院基本科研业务费项目YYWF201629中国地质科学院基本科研业务费项目Nos.YYWF201503中国地质科学院基本科研业务费项目YYWF201726 |
| |
| 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14C测年、δ13C、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30 ka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δ13C值表明，剖面在5~7 m和16~18 m范围相对其他深度更显暖湿气候特征；Fe3+/Fe2+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.
|
| 关 键 词： | 江汉平原 沉积物 浅层含水层 沉积环境演化 水文地质 |
| 收稿时间： | 2016-12-15 |
Evolution of Quaternary Sedimentary Environment in Shallow Aquifers,at Shahu Area,Jianghan Plain |
| |
| Abstract: | Hydrate-bearing sediments are the fundamental elements for the study of Earth Critical Zone. To broaden the studying dimensions of groundwater environmental problems, 14C dating, δ13C, iron valance and spectroscopic information of dissolved organic matter (DOM) in Shahu sediment profile were employed to characterize the evolution of sedimentary environment of 30 000 years in Jianghan plain. The values of Zr/Rb, Rb/Sr and δ13C indicate that the climates are much warmer and wetter in the periods of sediments formation in 5 to 7 m and 16 to 18 m than others; the ratio of Fe3+/Fe2+ states that sediments in the two periods is mainly in reductive environment. The evolution of sedimentary environment is generalized into five units including unit of weak bioclastic deposition near-surface, unit of strong deposition in warm and wet period based on the factor analysis and spectroscopic information of DOM. Evolution of Quaternary sedimentary environment suggested by sediment profile at Shahu provides essential data for researches on the regional groundwater environmental problems. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
|
点击此处可从《地球科学》下载全文 |
