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地球化学元素不仅反映地球表层沉积物的组成特征,并在分析物源、沉积过程及重建古环境等方面有积极意义。通过野外采样、室内实验,对巴丹吉林沙漠伊和吉格德湖、巴丹湖高大沙山区沉积物地球化学特征进行了分析。结果表明:沙山沉积物元素组成特征和含量略有区域差异;与上部陆壳平均化学组成(UCC)相比,常量元素中仅Si富集,其余均亏损;趋向迎风坡上部剖面,Si、K富集程度相对增加,其他常量元素(除Na)亏损程度增加。常量元素间的关系表明SiO_2影响沙山沉积物的地球化学组成及性质;迎风坡底部剖面沉积物呈现出多源性特征,可能是不同外力作用的结果。两湖区沙山的沙源属局部范围混合的结果,就近供应;干旱气候下沙山沉积物缺少较高等化学风化产生的条件,基本处在大陆风化早期阶段的初期。
Geochemical elements not only reflect the compositional characteristics of the Earth’s surface sediments, but also have positive significance in the analysis of source, deposition process and the reconstruction of paleoenvironment. Through field sampling and laboratory experiments, the geochemical characteristics of the sediments in Badain Jaran Desert, Iraq and Jigad Lake, and Badashan High Sands are analyzed. The results show that there is a slight regional difference in elemental composition and content of the sediments in the Shashan area. Compared with the UCC, the contents of Si in the sediments are only enriched in Si and the rest are depleted. K enrichment relative increase, the other constant elements (except Na) loss increased. The relationship between the elements of the constants indicates that SiO 2 influences the geochemical composition and properties of the sediments in the Shashan area. The sediments at the bottom of the windward slope exhibit multi-source characteristics, which may be the result of different external forces. The sand source of Shashan in the two lakes is the result of the local range mixing and is supplied nearby. In sandy arid climate, the sediments in Shashan area lacks the conditions for higher chemical weathering, and is basically in the early stage of continental weathering.