GRAIN SIZE OF SURFACE SEDIMENTS IN THE EASTERN MIN-ZHE COAST: AN INDICATOR OF SEDIMENTARY ENVIRONMENTS
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摘要: 对闽浙沿岸东部海域83个表层沉积物样品进行了粒度分析,探讨了沉积物类型和粒度参数的分布规律,并分析了物源和水动力条件对沉积物分布格局的影响。结果表明,研究区底质主要有砂、粉砂质砂、泥质砂、砂质粉砂、粉砂和泥6种类型。表层沉积物平均粒径为2.01~7.58 φ,呈现由岸向海粒度变粗、砂含量明显增加、粉砂和黏土含量明显减少的趋势;标准偏差0.48~2.86 φ,分选较差,但由中部向东西两侧分选性变好。研究区近岸细粒沉积物主要来源于长江等沿岸河流携带来的泥沙,外部粗粒沉积物主要是具有滨岸沉积特征的陆架源残留改造沉积,而闽浙沿岸流和台湾暖流对沉积物的分布起着主要的控制作用。依据粒度及其参数特征,综合考虑物源和水动力条件的影响,将闽浙沿岸东部海域划分为3个沉积区:近岸泥质沉积区、中东部混合沉积区和外陆架砂质改造沉积区。Abstract: The grain size of the 83 surface sediment samples taken from the eastern Min-Zhe coast are studied for sediment types and the distribution pattern of grain size parameters. The effect of sediment source and hydrodynamic conditions on the sediment distribution pattern is discussed. The following results have been achieved based on the detailed study of these samples:(1)There are six types of sediment in the study area and they are sand, silty sand, muddy sand, sandy silt, silt and mud. (2)The mean grain size is in a range of 2.01~7.58 φ, and the grains are coarsening seaward with the increase in sand and decrease in silt and mud. (3)The standard deviation varies between 0.48~2.86 φ. It shows a poor sorting in the whole study area and the lowest is in the middle of the study area, and from there the sorting is improved eastward and westward. (4)The inshore fine sediments are from the Yangtze River and other coastal rivers, and the offshore coarse sediments are the reworked relict deposits on shelf. Both the coastal current along the Min-Zhe coast and the Kuroshio current contribute to the distribution of sediments. Based on the data, the Min-Zhe coast is divided into three depositional zones, i.e. the inshore muddy zone, multi-sediments zone in the middle and eastern Min-Zhe coast and offshore reworked sand zone on the outer shelf.
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Key words:
- surface sediments /
- grain size /
- depositional environment /
- the eastern of min-zhe coast
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