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湖泊科学  2011 

埃及Faiyum盆地沉积物中粒度和磁化率对风沙活动的指示意义

DOI: 10.18307/2011.0222

Keywords: 粒度频率曲线,单峰,双峰,撒哈拉沙漠,尼罗河,石英形态,Faiyum盆地

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Abstract:

埃及Faiyum盆地是尼罗河下游的泛滥平原,沉积物主要来自尼罗河和撒哈拉沙漠.本文通过对钻孔FYAM(孔深4.6m)沉积物的粒度、磁化率的分析,并结合石英形态、石膏和碳酸盐含量分析,旨在寻找Faiyum盆地沉积物中代表风沙活动的粒度、磁化率特征.研究结果显示,钻孔沉积物中共发现7种粒度频率曲线类型,主要为细粒组(6-20μm)和粗粒组(80-100μm)两个峰值组合而成的单峰或双峰曲线.除去人类活动影响的高磁化率层以及高碳酸盐含量导致的低磁化率层外,其余层位沉积物的磁化率随着曲线类型的不同呈现规律性变化,当80-100μm峰为主峰时,磁化率明显偏低,风成石英颗粒含量升高,代表着风沙活动强烈,当6-20μm的峰为主峰时,磁化率相对较高,风成石英颗粒含量减少,意味着风沙活动减弱,以尼罗河物质输入为主。

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