水土保持学报2012，Vol.26Issue(1)：106-111,6.
渭河流域全新世古洪水滞流沉积物地球化学特征
Geochemical Characteristics of Holocene Palaeoflood Slackwater Deposits in Weihe River Basin
摘要
Abstract
On the basis of field exploration,Holocene palaeoflood slackwater deposits existing in loess-paleosols profile were found in middle reaches of Weihe river.According to stratigraphic configuration and OSL dating for slackwater deposits and Loess-paleosol samples,the age of the extreme palaeoflood is fixed between 3200 a B.P.and 2800 aB.P..Analysis of chemical elements shows that that the slackwater deposits were typical in the study area,and the chemical elements and oxide,variation coefficient of slackwater deposits was comparatively large,elements distribution was comparatively dispersed.The contents of Fe2O3,Al2O3,Ba,Cr,Cu,V,Rb in palaeoflood slackwater deposits were higher than that in paleosol and modern loess formation,and the content of SiO2,Zr in palaeoflood slackwater deposits were lower than that in paleosol and modern loess formation,according to the effect of element size,slackwater deposits,size fraction was small and its clay particle was relatively more,so the slackwater deposits deposited in weak hydrodynamic condition.Though climatic index analysis such as Rb/Sr and Ba/Sr,revealing that the extreme palaeoflood recorded between 3200 a B.P.and 2800 a B.P.occurred in the late Holocene megathermal period.In that period,climate environment is unstable,the summer monsoon remitted,and the rainfall variability is high.关键词
渭河流域/全新世/古洪水流沉积物/地球化学特征Key words
Weihe river basin/Holocene/palaeoflood slackwater deposits/geochemical characteristics分类
天文与地球科学引用本文复制引用
赵梅,查小春,黄春长,庞奖励..渭河流域全新世古洪水滞流沉积物地球化学特征[J].水土保持学报,2012,26(1):106-111,6.基金项目
国家自然基金项目 （）
中央高校基本科研业务费专项 （）
