常量元素含量作为滩涂沉积物粒径参数替代指标的可行性分析  

Feasibility of using major element compositions as proxies of grain size distribution for tidal flat sediments

作　　者：高翔[1] 张燕[1] 高超[1] 

机构地区：[1]南京大学地理与海洋科学学院,南京210093

出　　处：《华中农业大学学报》2014年第4期84-87,共4页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(41271467)

摘　　要：采用筛分-比重计法测定滩涂沉积物样品的粒度组成,同时利用X射线荧光分析测定其中Si、Al、Fe、Mg和K等常量元素的含量,通过建立二者之间的定量关系,探讨以滩涂沉积物常量元素组成作为粒径替代指标的可行性。结果表明:砂粒、粉粒、粘粒含量及粒径中值与常量元素含量之间有着十分显著的相关性,其中粘粒、粉粒含量及粒径中值与Al、Fe、Mg、K呈正相关,与Si含量呈负相关。砂粒含量则相反,与Al、Fe、Mg、K呈负相关,与Si含量呈正相关。利用常量元素含量预测滩涂沉积物粒径分布的关系建立的模型可行且结果可靠,对海洋科学和环境科学等领域具有良好的应用前景。Grain size distribution of marine sediments is an important indicator used for various top- ics in sedimentology, environmental change and many other fields. However, current methods of grain size determination are either very labor intensive or lack of accuracy. Feasibility of using major element compositions as proxies of grain size distribution for tidal flat sediments was studied. One hundred and fifty-two tidal flat sediment samples from coastal areas of East China Sea were collected and analyzed for grain-size distribution and major element composition. The results showed that the contents of sand, silt, clay and the median of grain size were significantly correlated with major element concentrations of sedi- ment samples. The contents of silt, clay and the median of grain size are positively correlated with the contents of A1,Fe,Mg and K while the content of sand is negatively correlated with the content of Si. The regress equations were obtained to predict grain size parameters using major element compositions. It is proved that using major element compositions as proxies of grain size distribution for tidal flat sediments is feasible.

关 键 词：滩涂沉积物 粒径分布 常量元素 替代指标 

分 类 号：P512.23[天文地球—地质学]