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对太湖现代沉积物进行了X射线衍射分析、粒度分析和常量元素分析,由此推断它们的矿物成分、化学风化程度差异,并分析了不同的水动力条件和物源.太湖沉积物的主要矿物组成是石英、云母、正长石和钠长石,粘土矿物为伊利石、绿泥石、高岭石和蒙脱石.北学组成显示,太湖沉积物的烧失量较高,与上部陆壳平均化学成分相比,Na、Ca、K、Mg亏损,Mn、Ti富集,上部陆壳成分标准化图表明其风化程度明显强于下蜀土.化学风化程度指标CIA、Na/K值和Fe/Mg值的变化也表明太湖沉积物的化学风化作用比下蜀土强,并存在地域的差别.太湖沉积物的CaCO3含量明显较低,反映了太湖流域本身的特点.所有这些特征表明,太湖沉积物的形成不仅与物源、地域位置有关,而且明显受人类活动的影响.
X-ray diffraction, particle size analysis and elemental analysis of modern sediments in Taihu Lake are carried out to deduce their differences in mineral composition and degree of chemical weathering, and to analyze different hydrodynamic conditions and provenances. The main minerals in the Taihu Lake sediments Composed of quartz, mica, orthoclase and albite, and the clay minerals are illite, chlorite, kaolinite and montmorillonite.The composition of North School shows that the loss on sediment of Taihu Lake is higher than that of the upper crust Compared with the chemical composition, Na, Ca, K, Mg loss, enrichment of Mn and Ti, the normalized maps of the composition of the upper continental crust show that the degree of weathering is obviously stronger than that of Xiashu. The chemical weathering indicators CIA, Na / The change of Mg value also shows that the chemical weathering of the sediments in Taihu Lake is stronger than that of Xiashu and there are geographical differences.The content of CaCO3 in the sediments of Taihu Lake is obviously lower and reflects the characteristics of the Taihu Lake basin itself.All these characteristics indicate that the Taihu Lake sediments The formation of objects is not only related to the source and geographical location, but also obviously influenced by human activities.