梁子湖表层沉积物元素分布模式及地球化学意义  

Distribution Model and Geochemical Characteristics of the Elements in the Surface Sediments of Liangzi Lake

作　　者：董金秀[1] 乔胜英[2] 谢淑云[3] 

机构地区：[1]中国地质大学研究生院,武汉430074 [2]中国地质大学生物地质与环境地质教育部重点实验室,武汉430074 [3]中国地质大学地球科学学院,武汉430074

出　　处：《地质科技情报》2010年第3期91-96,共6页Geological Science and Technology Information

摘　　要：表层沉积物中元素分布模式及其地球化学特征能提供沉积物物源及易受人为活动影响的重金属元素等信息。运用X-射线荧光光谱仪和单道等离子发射光谱仪等对梁子湖表层沉积物中的常量元素和微量元素进行了分析测试。运用多元统计等方法对测试数据分析发现,梁子湖表层沉积物中的常量元素分布受介质物理化学条件影响比较明显;微量元素中除Zr和Nb等元素外,其余元素的质量分数相对较低;重金属元素的质量分数值大多数接近于武汉湖泊的背景值和欧美湖泊的背景值,低于东湖和汤逊湖等受人为活动影响较大的湖泊。在平面分布上,大多数元素都有明显的平面分布规律,K2O、CaO、Na2O、MgO、Al2O3、Fe2O3、Li、Rb、Sr、Ba、Mn、Se、Ni、Sc等都在东北部和东部富集,而Si在西南部富集,Zr和Hg在中部富集。元素分布规律主要受沉积作用和湖东地区矿山地质背景等因素的控制。The distribution model and geochemical characteristics of elements in the surface sediments can indicate the sources of the sediments and show the informaton of heavy metal element easily impacted by human.The major and trace elements concentrations were analysed by AFS and ICP-AES.In this study,the results of data analysis by multivariate statistical analysis show that the major elements in sediments of Liangzi Lake are affected by the physical and chemical factors of the water body.The trace elements are relatively lower except Zr and Nb.Most of heavy metal elements contents in the studied lake were found closed to the sediments background value of Wuhan,Europe and America,but lower than those of its adjacent East Lake and Tangxun Lake which are affected by human easily.In Liangzi Lake,most elements have an obvious horizontal distribution model,K2O,CaO,Na2O,MgO,Al2O3,Fe2O3,Li,Rb,Mn,Se,Ni and Sc are riched in northeast and east part of the lake,with SiO2 enriched in southwest,and Zr and Hg enriched in the middle part.This distribution model may be attributed to the sedimentation and the geological background of the mines in the east of the lake.

关 键 词：梁子湖 表层沉积物 元素 地球化学 分布 

分 类 号：X141[环境科学与工程—环境科学]