红土和黄土剖面常量元素地球化学特征及其对比  

Geochemical characteristics and the comparison of major elements in red earth profiles and loess profiles

作　　者：熊平生 

机构地区：[1]衡阳师范学院城市与旅游学院,衡阳421002

出　　处：《干旱区资源与环境》2018年第4期160-164,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(41471153);湖南省自然科学基金项目(2016JJ6015)资助

摘　　要：对比分析了4个红土剖面、3个黄土剖面常量元素地球化学特征,结果表明:⑴常量元素组分皆以SiO_2、Al_2O_3和Fe_2O_3为主,三者平均总量红土高于黄土。黄土易溶组分中Na_2O、MgO和CaO的平均含量明显高于红土,难溶组分中Fe_2O_3、Al_2O_3的含量低于红土。⑵常量元素线性回归表明,黄土、红土Al_2O_3与Fe_2O_3表现为明显的正相关,SiO_2分别与Al_2O_3、Fe_2O_3表现为明显的负相关,红土常量元素之间的相关性弱于黄土。⑶UCC标准化显示,红土、黄土Si元素分布在1.00附近,亏损或富集不明显。投影点在风化趋势线上的分布表明,黄土处于化学风化过程的早期阶段,红土已经进入化学风化过程的中晚期阶段。⑷常量元素比值分析表明,洛川黄土、信阳黄土和武威黄土物源的相近性,松木红土、汤溪红土、川西红土和向阳红土物源的复杂性。The geochemical characteristics of major elements of 4 red clay profils and 3 loess profils were analyzed and compared. Results are shown as follows：（1）The major elements are dominated by SiO2 ,Al2O3 and Fe2O3. The total average content of red earth of them is higher than that of Loess ,The soluble components contents of Na2O, MgO and CaO in loess are obviously higher than that in red earth. The average insoluble components contents of Fe2O3 and Al2O3 are lower than that in red earth. （2）Linear regression of the major elements showed that the ele-ments of Al2O3 and Fe203 show obviously positive correlation during the weathering process, while the element of SiO2 shows obviously negative correlation with the elements of Al2O3 , Fe2O3 respectively. The correlations between the major elements in loess are better than that of in red earth. （3）UCC standardized show that the element of Si distributes in the vicinity of 1.00 in red earth and loess, its loss or enrichment is not obvious. The distribution of the projected points on the weathering trend line shows that the chemical weathering of loess is in the early stage, while the red earth has entered the middle and late stage of chemical weathering. （4）The ratio of major elements indicates that the Luochuan loess, the Xinyang loess and the Wuwei loess have similar material sources. While the prove- nance of Songmu red earth, the Tangxi red earth, the Chuanxi red earth and Xiangyang red earth are complex.

关 键 词：红土剖面 黄土剖面 常量元素 地球化学 

分 类 号：S153[农业科学—土壤学]