金衢盆地红土地球化学特征  

Geochemical Characteristics of Red Earth in Jinhua-Quzhou Basin

作　　者：李建武[1] 叶玮[1] 朱丽东[1] 李凤全[1] 姜永见[1] 伊继雪[1] 

机构地区：[1]浙江师范大学地理过程实验室,浙江金华321004

出　　处：《土壤通报》2010年第1期34-37,共4页Chinese Journal of Soil Science

基　　金：浙江省自然科学基金项目(项目批准号:X506313);国家自然科学基金项目(项目批准号:40571067)资助

摘　　要：用X射线荧光光谱法(XRF)对金衢盆地的5个剖面127块样品进行测试,分析结果表明:主量元素组成以SiO2、Fe2O3、Al2O3为主,K、Na、Ca、Mg等易溶组分的含量很低,TiO2含量的平均值高于UCC值;Fe2O3、MnO含量在沉积型红土网纹和均质红土的交界处明显聚集,推测与不同沉积层交界处理化性质突变有关,而基岩风化壳型红土则逐渐过渡;SiO2、Fe2O3、AL2O3等化学成分和硅铝系数等化学风化指标指示沉积型红土由网纹至均质红土风化强度减弱的趋势,而基岩风化壳型红土的K、Na、Ca、Mg及TiO2含量均呈现从基岩到红土层风化强度逐渐增大的趋势。127 samples of red earth from 5 sections in Jinhua-Quzhou basin were measured by means of X-ray fluorescence.The results showed that the major elements consist of SiO 2,Fe 2 O 3 and Al 2 O 3 mainly,and K,Na,Ca,Mg and P were very low.The average content of TiO 2 was higher than that of UCC.The elements of MnO,Fe 2 O 3 were accumulated between plinthitic and typical red earth,speculating that related to geochemical characteristics variations of different sediments.But that of the red earth in weathering crust was changed gradually.The changing trend of chemical composition and weathering characteristic value showed that the weathering of plinthitic red earth was more intense than that of typical red earth.But from the elements of K,Na,Ca,Mg and TiO 2,the weathering of red earth in weathering crust was enhancd gradually.

关 键 词：网纹红土 风化特征 主量元素 金衢盆地 

分 类 号：P595[天文地球—地球化学]