厦门港湾氧化-还原沉积环境的划分

DIFFERENTIATION OF OXIDATION-REDUCTION SEDIMENTARY ENVIRONMENT OF THE XIAMEN HARBOUR

据1980—1981年厦门港湾环境综合调查资料,报道了该港湾表层沉积物Eh,Fe^(3+)/Fe^(2+)值和有机质含量的分布,并据此将该港湾划分为强氧化、弱氧化、弱还原和还原四个氧化—还原沉积区。

The samples of surface layer sediments from 220 stations from the Xiamen Harbour were analyzed for Eh value,ratio of Fe3+/Fe2+and content of organic materials.The results show that the Eh value,ratio of Fe3+/Fe2+in the harbour is higher that in the estuary.On the contrary,the content of organic materials in the estuary is less than that in the harbour.In the survey area,the range of change and average value of Eh,Fe3+/Fe2+and content of organic materials were—213 to 436,62,9(mV);0.29—14.7,1.49;ND—3.25,1.18(%).We have found that hydrodynamic action is a major controlling factor of oxidationreduction sedimentary environment in the survey area.There is a close relationship between the Eh,ratio of Fe3+/Fe2+,content of organic materials and sedimentary type.Eh value,ratio of Fe3+/Fe2+in coarse sandy area are higher than that in find sandy and muddy areas.While the content of organic materials in coarse sandy area is less than that in find sandy and muddy areas.Based on the results,the survey area can be groupes into strong oxidation area,weaker oxidation area,weaker reduction area and reduction sedimentary area.The weaker reduction area covers about 160kin2,equal to 2/3 of the survey area.