高校地质学报2018，Vol.24Issue(3)：380-389,10.DOI:10.16108/j.issn1006-7493.2017135
河南晚更新世—全新世黄土记录的环境变化及物源特征
Environment Evolution and Provenance Characteristics of the Loess Since the Late Pleistocene in Henan Province
摘要
Abstract
End-member analysis (EMA) was performed on particle size data collected from 75 samples from the continuous Late Pleistocene-Holocene Gedazhang (GDZ) loess-palaeosol profile in Xinzheng, Henan Province. Wavelet analysis was also performed for the EMs in the time domain. The results show that three EMs can be separated from sediment particle sizes in the GDZ profile. EM2 may have been influenced by dynamic changes in the strength of the East Asian summer monsoon, with changes in temperature and humidity caused by the summer monsoon resulting in weathering and pedogenesis. EM2 appears to have been influenced by the dynamic effects of dust storm accumulation controlled by the northwesterly monsoon, and contains typical components of aeolian loess. EM3 contains coarse-grained components that are indicative of strong transporting forces and proximal sediment sources influenced by northeasterly winds from the Yellow River flood plain, particularly significant since 3100 a. Results of wavelet analysis show that each EM has different periodic characteristics at different time scales. The EMA method is effective in indicating the sedimentary environment and sediment source characteristics. The combined characteristics of each EM reflect the sedimentary dynamics and can also derive sedimentary dynamic changes since the Late Pleistocene. The wavelet analysis method provides important results in terms of cyclic features and trends of dynamics change in particle size within each EM.关键词
晚更新世/黄土-古土壤/粒度/端元分析/小波分析Key words
Late Pleistocene/Loess-paleosol/grain size/End-Member analysis/wavelet analysis分类
天文与地球科学引用本文复制引用
王兆夺,黄春长,周亚利,庞奖励,查小春,郭永强..河南晚更新世—全新世黄土记录的环境变化及物源特征[J].高校地质学报,2018,24(3):380-389,10.基金项目
国家自然科学基金项目(41771110) （41771110）
中央高校基本科研业务费专项基金(GK.201704013)联合资助 （GK.201704013）
