湖南洞庭湖地区红土的元素地球化学特征及其指示意义  

Element geochemistry of laterite in the Dongting Lake area,Hunan,China and its indicative significance

作　　者：张建新 鲁江 邢旭东 申志军 吕焕哲 张国梁 

机构地区：[1]湖南省地质研究所,湖南长沙410007

出　　处：《地质通报》2007年第11期1435-1444,共10页Geological Bulletin of China

基　　金：中国地质调查局<湖南省洞庭湖区生态地球化学调查>项目(编号:1212010310304)的课题<洞庭湖区第四纪环境地球化学研究>的部分成果

摘　　要：红土作为一种热带、亚热带地区广泛分布的松散岩类,其蕴含的气候环境变化信息和养分状况使得对其研究具有重要的理论和实际意义。在对洞庭湖区红土地层年代学研究的基础上,详细讨论了红土中元素的分布特征及控制因素,认为第四纪红土的地球化学特征反映了区域气候环境、流域物源特征和红土化作用强度的变化,对生态地球化学环境恢复有重要意义。Laterite is one kind of loose sediments distributed widely in the tropic and subtropic areas. Its study has great theoretical and practical significance as it involves information of climatic and environmental changes and nutrient conditions. This paper discusses in detail the distribution characteristics and controlling factors of elements in laterite of the Dongting Lake area on the basis of the chronological study of laterite strata. It is concluded that the geochemical characteristics of Quaternary laterite reflect the regional climatic conditions, material source characteristics of the drainage area and change in intensity of lateritization. All the above information is of great scientific significance for the rehabilitation of the ecogeochemical environment.

关 键 词：红土化 脱硅富铁铝作用 网纹红土 元素对比值 气候变化 洞庭湖地区 

分 类 号：P595[天文地球—地球化学]