摘要
晚第四纪水成沉积、风成沉积、古土壤等的磁组构研究表明，不同成因的沉积物具有明显不同的磁组构特征。一般地，水成沉积的体积磁化率Ｋ受物源和水动力因素控制，Ｐ和Ｆ均＞１．０２，ｑ＜０．５；风成沉积的Ｋ受物源控制，内陆黄土的Ｋ明显高于沿海黄土及海岸风沙Ｋ，Ｐ和Ｆ均＜１．０２，ｑ的平均值＞０．５５；古土壤的Ｋ受母质沉积类型和成土环境的氧化还原条件控制，内陆古土壤的Ｋ偏高，沿海古土壤的Ｋ偏低，内陆古土壤的Ｋ远高于沿海古土壤的Ｋ，Ｐ和Ｆ均＜１．０２，ｑ的平均值在０．５左右。运用典型沉积的磁组构特征对比分析未知沉积物，可以得到未知沉积物的物源、沉积过程和环境信息。
The study on the magnetic fabric of the Late Quaternary hydraulic deposit,eolian deposit and paleosol shows that each type of the deposits has different magnetic fabric characteristics.Generally speaking,K value of hydraulic deposit is controlled by sediment source and hydrodynamic factor(P>0 2,F>1 02 and q<0 5);K value of eolian deposit is controlled by sediment source,and K value of inland loess is markedly higher than that of coastal loess and eolian dune(P<0 2,F<1 02,average value of q is higher than 0 55);K value of paleosol is controlled by deposit type and oxidation reduction state of pedogenesis environment,and K value of inland paleosol is higher than that of coastal paleosol,P<0 2,F<1 02.Average value of q is about 0 50.The comparative magnetic fabric analysis can be used to get source,process and environmental information of unknown sediments.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1999年第2期85-94,共10页
Marine Geology & Quaternary Geology
基金
同济大学海洋地质开放实验室资助项目
国家自然科学基金
关键词
水成沉积
风成沉积
古土壤
磁组构
沉积环境
magnetic fabric hydraulic deposit eolian deposit paleosol sedimentary environment
