福建海岸带沉积物中6种氧化物的地球化学特征

Geochemical characteristics of six oxides in Fujian coastal sediments

据1985年福建海岸带调查资料,对该区表层沉积物中Mno、Fe_2O_3、MgO、Al_2O_3、CaO、TiO_2的地球化学特征进行研究,结果表明:除CaO 外,其他氧化物在主要港湾中的平均含量分布呈北高南低的特征。Fe_2O_3、MgO、Al_2O_3、TiO_2含量与沉积物粒径相关性好,表明了沉积物类型制约着这几种氧化物的含量分布。Fe_2O_3与MgO、Al_2O_3,TiO_2与MgO、Al_2O_3相关性好,体现了在沉积过程中这些物质存在着伴生关系。本区活性Mn 占总Mn 量78.7%,而活性Al 和Ti 只分别占各自总量的10.3%和11.8%。三沙湾和湄洲湾沉积物中的Mn、Fe、Mg、Ti 相对于Al 有所富集。

The distribution and some geochemical characteristics of MnO,Fe_2O_3,MgO,Al_2O_3,CaOand TiO_2 in the surface sediments from Fujian coastal zone is reported.It shows that the av-erage content of each oxide in the major bays has a tendency of higher in the north and lowerin the south.The ratio of active Mn to total Mn is 78.7% ,and the authigenic exponent is Mn>Ti>Al.The correlation coefficient of the Fe_2O_3,MgO,Al_2O_3 and TiO_2 contents to the sed-iment Md_(?) is 0.74,0.75,0.76 and 0.81 respectively.Fe_2O_3 and TiO_2 have a good relationshipwith MgO and Al_2O_3.Mn,Fe,Mg and Ti show to be enriched relative to Al in sediments ofthe Sansha and Meizhou Bays.