水土保持学报2013，Vol.27Issue(2)：95-100,6.
长江宜都段全新世古洪水滞流沉积物研究
Holocene Palaeoflood Slack Water Deposits at the Yidu Reach of Changjiang River Valley
摘要
Abstract
Three layers of palaeoflood slack water deposits(SWD) were investigated in the Holocene profile at the Yidu reach of the Changjiang river valley. According to stratigraphic correlation with the QFC profile in the Hanjiang river and OSL dating, three palaeoflood events respectively were determined to be 950~850 a B. P. , 750~650 a B. P. , 550~350 a B. P.. Field macroscopic characteristics, grain-size distribution and chemical elements indicated that palaeoflood SWD were deposited as the results of long-distance transportation at the flood high water level stage. The palaeoflood SWD was sandy silt in contrast to the modern soil, recent loess and palaeosol were clayey silt. The curves of palaeoflood SWDs peak were shifted clearly to the coarse and sand side. Compared to the modern soil, recent loess and palaeosol, medium size and mean size of palaeoflood SWDs were relatively higher. In addition, Fe2O3, MnO contents and Rb/Sr ration, (Al2O3 + Fe2O3)/(CaO+MgO+Na2O) ration of palaeoflood SWDs were very low, while Na2O, CaO, Sr contens and (Na2O+CaO)/Al2O3 ration of palaeoflood SWDs were high. The clay contents (< 2 μm) of palaeoflood SWDs was low while sand contents(>100 μm) was high. These palaeoflood SWDs have not been affected yet by suffered from weathering and pedogenesis.关键词
古洪水滞流沉积物/黄土/全新世/宜都段/长江Key words
palaeflood slack water deposits/ loess/ Holocene/ Yidu reach/ Changjiang river valley分类
天文与地球科学引用本文复制引用
郭永强,黄春长,庞奖励,查小春,周亚利,王娟,周亮..长江宜都段全新世古洪水滞流沉积物研究[J].水土保持学报,2013,27(2):95-100,6.基金项目
国家自然科学基金项目(41030637 （）
41271108) （）
教育部博士点基金优先发展领域项目(20110202130002) （20110202130002）
