摘要
长江和黄河以及韩国的Keum和Yeongsan江,具有不同的微量元素地球化学特征。韩国河流沉积物中微量元素含量多介于长江和黄河之间,以Li、Rb和Th较高为特征,粒级效应明显。长江富铁族和铜族元素,黄河则Sr最高,其他元素均低于其他3条河流;韩国河流中Sr主要赋存于长石中,而长江和黄河中则主要赋存于碳酸盐矿物中。根据沉积物中元素的赋存相态及含量,我们认为Ti、Cr/Th、Ti/Nb和Zr/Nb等可以作为判别西太平洋边缘海,尤其是黄海中长江、黄河与韩国河流物质贡献的可靠地球化学参数,但在运用中必须注意粒级效应影响。
Compositions of trace elements in Chinese and Korean river sediments were different. Trace element concentrations in Korean river sediments mainly lie between those of the Yangtze River sediments, which have the highest average values for most elements, and the Yellow River sediments, which present the lowest values except for Sr. The concentrations of Li, Rb and Th in Korean river sediments are higher than those in the Yangtze and Yellow River sediments, but have significant grain size effect. Sr mostly resides in feldspar in Korean river sediments, but it is largely found in carbonate minerals in the Yangtze and Yellow River sediments. Elements such as Ti, Nb, Zr, Sc, Th, Ba, Rb, and Sr have the largest contents in residual fraction of the Korean river sediments, while Mn and Pb mostly exist in 1 M HClleachable fractions, suggesting human pollution effect on river geochemistry. Conclusively, Ti, Ti/Nb, Zr/Nb, and Cr/Th can be used to recognize sediment sources (that is to say, where the sediments come from? From the Yangtze River, Yellow River or Korean Keum and Yeongsan Rivers) in view of their stable behaviors and distinct compositions among these river sediments. These geochemical indices, therefore, can be used to identify and trace these river matters in the West Pacific seas, especially in the Yellow Sea which is just surrounded by China continent and Korea Peninsula.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2003年第2期19-24,共6页
Marine Geology & Quaternary Geology
基金
国家自然科学基金资助项目(49976016
40206008)
韩国科学基金资助项目(KOSEF
KIST)
