The characteristics of grain size and elements from Lake Chenpu sediment in the Hetao Plain
WANG Jing-zhong1,2, ZHU Chi3, LAN Bo4, LI Xiao1, LIU Zhuo1
1. Experiment and Practice Teaching Center, Heibei GEO University, Shijiazhuang 050031, China;
2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
3. Jiangsu Provincial Academy of Environmental Science, Jiangsu Provincial Key Lab of Environmental Engineering, Nanjing 210036, China;
4. College of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404000, China
In this paper, grain size and element from different sediments in the Hetao Basin were analyzed, based on the results of age and environmental indicators from Lake Chenpu sediment, by means of canonical discriminant analysis technology, and combined with historical and literature materials, environmental changes were revealed during two typical periods in recent 300years. Because of the flood activities from the migration of the Yellow River channel in about 1850AD, the grain size characteristics of the sediments at 55~50cm of Lake Chenpu sediment (CP1), which displayed grey-yellow clay layer, were closed related to the slow-flow sediment along the Yellow River bank, their median diameter and mode value were 3.8μm, 7.7μm and 4.4μm, 5.0μm respectively, and the values of the elements and their ratios (including K/Ti, Al/Ti and K/Sr) were 7.1, 21.5, 102.7 and 6.2、20.7、87.8 respectively, and their scattered points were also distributed in the same area in the canonical discriminant score scatter plot, which was separated from the distribution areas of other types of sediments, and the element ratios (including K/Ti Al/Ti and K/Sr) could be taken as environmental proxy indicators for the flood activity from the lake sediments. Since 1995, due to the large-scale reclamation of sandy land under human activities in this region, wind-sand activities enhancing, the grain size characteristics of the sediments at the top of 15cm (CP2) were similar to the aeolian sediment, their median diameter and mode value were 20.1μm, 19.6μm and 41.6μm, 45.7μm respectively, and their elements scattered points were also distributed in the same area, and the study results were in good agreement with the literature records.
汪敬忠, 朱迟, 兰波, 李霄, 刘卓. 河套平原湖泊陈普海子沉积物粒度与元素分析[J]. 中国环境科学, 2019, 39(1): 358-365.
WANG Jing-zhong, ZHU Chi, LAN Bo, LI Xiao, LIU Zhuo. The characteristics of grain size and elements from Lake Chenpu sediment in the Hetao Plain. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 358-365.
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