宣城网纹红土红白组分Fe、Mn、Al、Sr元素含量的变化特征及古气候意义

摘要

Recently,increasing interest has focused on the Vermicular Red Clay found in southern China.In this study,the red and white part of the vermicular red clay in Xuancheng profile were separated and analyzed by ICP-AES.The results show that,the content of Fe,Mn,Al,Sr in Red and White part are significantly different.The content of Fe in white part is lower than in the red part,and the gap increases with the increasing depth.The content of Mn in white part is changing a little.The content of Al and Sr in white part is lower than in the red part generally.Meanwhile,the high and low content of these two elements changed alternatively with the increasing of depth.But,the content of Al and Sr in red part are changed a little.%通过对宣城向阳第四纪网纹红土中红、白组分进行分离,并运用ICP-AES分别分析了红、白组分内Fe、Mn、Al、Sr四种元素的含量特征.结果发现,向阳剖面网纹红土中红、白组分的元素含量有明显的差异.其中白色组分铁含量较红色组分小,且随着深度的增加以及网纹化程度的增加,其含量与红色组分差别也加大.Mn元素在红、白组分内的总体差别不大.Al、Sr元素表现出了白色组分较红色组分小的特征,但这两种元素在白色组分内表现出随深度增加而呈现明显的类似“黄土-古土壤”序列的旋回变化特征.在红色组分内,Al、Sr元素随深度变化不大.