Geochemistry of sediments from the Huaibei Plain (east China): Implications for provenance, weathering, and invasion of the Yellow River into the Huaihe River
The sediments of the Huaibei Plain in semi-humid mid-eastern China represent valuable geological records with respect to eolian-fluvial interactions, depositional environments, and climate change in this region.Provenance and weathering conditions are often reconstructed using sedimentary geochemistry methods.In this study, an 8-m core from Huainan and a set of loess samples from northern and southern China were analyzed for major, trace, and rare earth elements (REEs).Results were compared to determine the samples provenance.The major, trace, rare earth elements contents, and grain size distribution were found to fluctuate widely in the 2-8 m section of the Huainan core and more narrowly closer to the surface (0-2 m).This suggests a provenance shift at a depth of 2 m.The TiO2/Al2O3, SiO2/Al2O3, Th/Nb, La/ Nb values and REE patterns in the upper core (0-2 m) are similar to those found in samples from the Chinese Loess Plateau (CLP).These results suggest that the CLP in northern China is likely to be the primaw origin of the upper part (0-2 m) of the Huainan core.Compared with CLP samples, the upper part of the Huainan core exhibits lower K2O/Al2O3 values and higher chemical alteration indices.This is indicative of the materials substantial weathering during transportation and re-deposition and implies that these sediments could reasonably be classified as typical recycled loess.The sediments may have been transported from the CLP to Huainan as Yellow River flood events, probably during the last deglaciation (~13.2 ka) as a result of increased precipitation, along with glacier and snow melt in the upper reaches of the Yellow River catchment during this period.This suggests that the Yellow River may have migrated into the Huaihe River catchment much earlier than the earliest historical records (361 BCE) suggest.The implications of this would be profound with respect to Chinese history.
Geochemical Recycled loess Provenance Weathering Yellow River Huaibei Plain
Lei Zhang Xiaoguang Qin Jiaqi Liu Chunqing Sun Yan Mu Jinliang Gao Wenfeng Guo Shikai An Chunhui Lu
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Aca Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Aca National Engineering Laboratory for Ecological Environmental Protection in Coal Mines, Huainan, Anhu
国际会议
中国科学院地质与地球物理研究所2016年度(第16届)学术年会
北京
英文
481-481
2017-01-01（万方平台首次上网日期，不代表论文的发表时间）