INFLUENCE OF DIFFERENT PRETREATMENT METHODS ON GRAIN SIZES OF THE DONGSHA SEDIMENTS OF THE SOUTH CHINA SAE
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摘要: 通过采用不同方法对东沙沉积物样品进行了预处理,并采用综合法进行了粒度分析,以探讨东沙沉积物中碳酸盐和有机质对其粒度的影响。结果表明,去除有机质后沉积物的平均粒径和63~4 μm粒径范围内的组分明显减小,有机质含量变化与平均粒径变化呈明显负相关,说明东沙沉积物中有机质的沉积是伴随细粒悬浮物质和胶体物质沉积下来的,且对细颗粒有明显的絮凝作用;去除碳酸盐后沉积物的平均粒径呈减小趋势,但粒径范围内组分含量的变化不明显,且碳酸盐含量的变化与沉积物粒径变化的关系也不甚密切。Abstract: Sediments from Dongsha area of the Soth China Sea are pretreated by different methods for grain size analysis and by integrated methods for particle size analysis in order to determine influences of carbonate and organic matters on the particle-size characteristics. The results showed that average grain sizes and components within 63~4 μm grain sizes reduced significantly after removal of organic matter, and changes in contents of organic matters and those in the average grain sizes were negatively correlated, indicating that organic matter in Dongsha sediments was deposited with suspended materials of fine grain and colloidal material, and had a clear role in flocculation of fine grains. Average grain size reduces significantly after removal of carbonate, but influences of carbonate on contents of components within grain size scope are not clear, and the relationship between changes in the carbonate content and those in average grain sizes is not close.
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Key words:
- sediments /
- particle size analysis /
- pretreatment method /
- synthesis method
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