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为研究衡阳市红土风化强度和原始物质来源,对高兴剖面86件样品进行了元素测试和分析。结果表明:1)地球化学参数CIA、BA值指示,风化强度由底部往上呈现减弱趋势,高兴剖面上段(72cm以上)为中等风化强度,下段(72cm以下)为强烈化学风化程度。2)元素UCC标准化曲线显示,元素Na、Ca、Mg、K和Sr表现出不同程度的亏损,AI和Fe为轻度富集,暗示了红土剖面曾经遭受了Na、Ca、Mg、K化学风化。3)A-CN-K风化趋势图指示,不同土层在物质组成上具有高度均一性,剖面风化过程发展到K元素迁移阶段,风化作用以伊利石和钾长石风化为特征;4)常量元素比值显示,高兴剖面红土与衡山花岗岩风化壳元素比值曲线相近似,微量元素La/Co、Th/Cr比值与酸性来源细粒沉积物比值参数范围较吻合,说明了高兴剖面红土可能与花岗岩风化壳同源。
In order to study the weathered strength of red earth and the source of raw materials in Hengyang, 86 samples were tested and analyzed. The results show that: 1) The geochemical parameters CIA and BA indicate that the weathering intensity decreases from the bottom to the top, and the upper section (above 72 cm) is moderately weathered, while the lower section (below 72 cm) is strongly chemical and weathering. 2) The elemental UCC normalization curves show that the elements Na, Ca, Mg, K and Sr show different degrees of depletion, and AI and Fe are slightly enriched, suggesting that the laterite profiles have been subjected to chemical weathering of Na, Ca, Mg and K . 3) A-CN-K weathering trend indicates that there is a high degree of homogeneity in the composition of matter in different layers of soil, and the profile weathering progresses to the K-element migration stage. Weathering is characterized by the weathering of illites and potash feldsones. 4) The ratios show that the ratios of La / Co, Th / Cr ratios of the kaolinite red clay and Hengshan granite weathering crust are close to each other, which is in good agreement with the ratio of the acid source fine-grained sediments. It is concluded that the kaolinite red clay may be related to the granite weathering crust Homologous.