摘要
为了研究＂巫山黄土＂的地球化学特征,利用X射线荧光光谱仪对＂巫山黄土＂样品的常量元素进行测试分析,结果表明：（1）常量元素SiO2、Al2O3、TFe2O3、Fe2O3和TiO2含量随着剖面中细颗粒粘土含量的变化呈现明显的旋回变化特点,该特点对＂巫山黄土＂沉积时的气候演化规律具有一定的指示意义;（2）在化学风化过程中,元素Si、Al、Fe、K、Mn、Ti之间具有很好的相似性,表现为明显的正相关,而它们与元素Ca、P却具明显的差异性,表现为明显的负相关;（3）沉积物的粒径对部分常量元素地化特征具有一定的控制效应,Al、Fe、Ti等元素主要富集于0.8~2.0μm黏土粒级沉积物中,而在40~100μm的粗粉砂和极细砂粒级中的含量极少;（4）＂巫山黄土＂常量元素UCC标准化后分布曲线近于平坦线型且靠近UCC分布曲线,指示其可能为风积成因.
In this paper,we present the major element compositions of the＂Wushan loess＂,measured by X-ray fluorescence spectrometer.The content of major elements SiO2,Al2 O3,TFe2 O3,Fe2 O3 and TiO2 varies with the content of clay in the profile.Besides the content of these elements displays several obvious circles and could be indicators of climate when the＂Wushan loess＂deposited.The elements of Si,Al,Fe,K,Mn and Ti show similarity and positive correlation during the weathering process while they are different from Ca and P,with negative correlation.The results reveal that grain size compositions of the sediments could dominate the content of some major elements.Major elements such as Al,Fe and Ti are concentrated in the clay fraction between 0.8and 2.0μm instead of the coarse silt and very fine sand fractions（40-100μm）.The UCC-normalized patterns of the＂Wushan loess＂are almost flat indicating the aeolian origin.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2013年第5期916-922,共7页
Earth Science-Journal of China University of Geosciences
基金
中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金(No.SKLLQG0908)
国家自然科学基金(Nos.40971008
40771213)
关键词
长江上游
“巫山黄土”
沉积物
常量元素
粒度效应
地球化学
upper reaches of the Yangtze River
＂Wushan loess＂
sediments
major elements
grain size effect
geochemistry.
