摘要
运用同样的样品采集和测试方法比较分析了我国的长江和黄河以及韩国的Keum和Yeongsan江的常量元素地球化学特征。韩国河流沉积物中Ca及碳酸盐含量显著低于长江和黄河,而其他元素含量则在二者之间;黄河沉积物以总无机碳(TIC)、Na和Ca含量高为特征,而长江沉积物则显著富集Ti和P。Keum和Yeongsan江沉积物中P、Ca、Fe和Mg在酸溶相中比例可达30%～66%,而K、Al和Ti则富集在残渣相中。韩国河流沉积物极低的Ca含量同流域缺乏碳酸盐源岩密切相关,其沉积物主要由侏罗-晚白垩纪的花岗岩经过中等程度的化学风化而成。虽然Ca在中韩河流沉积物之间含量差异显著,但必须谨慎运用全钙含量来识别海区物源。而沉积物中非碳酸盐态钙(Ca)及相应的K/Ca和Al/Ca比更适合用来示踪黄河及Keum和Yeongsan江沉积物;Ti则可以用来区分长江与其他河流沉积物。
Compositions of major elements of Chinese and Korean river sedimen ts were characterized on the basis of identical sample collections,processes an d measurements.The Korean r iver sediments have much lower TIC,C a and carbona te contents than Chinese river sediments,whereas the Changjiang sediment is cha racterized by hi gh Ti content and the Huanghe sediment by h igh Ca,Na and car bonate contents.The acid-leachable fractions of P,Ca,Fe and Mg account for 30%～66%of the bulk contents of the Korean river sedim ents,whereas K,Al and Ti primarily reside in the residual fra ctions.The Korean river sediments a re mainly sourced from Jurassic-Cre taceous granite which underwent fairly s tro ng chemical weathering,and the drainage basins lack carbonate rocks,which results in the very low Ca contents in river sediments.It is suggested that bul k Ca composition is not appropriate for discriminating Chinese and Korean r iver sediments because of biogenic C aCO 3 in marine environment,whereas non-carbonate-bound Ca contents and ratios of K/Ca and Al/Ca can discriminate sediment sources i n view of their stable behaviors and dis tinct compositions between these river se diments.
出处
《地球化学》
CAS
CSCD
北大核心
2004年第1期99-105,共7页
Geochimica
基金
国家自然科学基金(49976016
40206008)
韩国自然科学和科技部基金资助项目(KOSEF和KIST)
关键词
河流沉积物
常量元素
地球化学
物源示踪
river sediment
ma jor elements
geo chemistry
provenance identification
Korea
China
