衡阳市区高兴剖面红土化学风化强度与物源分析

发布时间：2019-04-23 12:14

【摘要】：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。
[Abstract]:In order to study the weathering strength and original material source of red soil in Hengyang City, 86 samples of happy section were tested and analyzed. The results are as follows: 1) the geochemical parameter CIA, BA indicates that the weathering intensity decreases from bottom to top, and the upper section of happy section (above 72cm) shows moderate weathering strength. The lower part (below 72cm) is strongly chemically weathered. 2) the normalized curve of element UCC shows that elements Na,Ca,Mg,K and Sr show varying degrees of deficit, while AI and Fe are slightly enriched, suggesting that the laterite profile has suffered from Na,Ca,. Mg,K chemical weathering. 3) the A-CN-K weathering trend chart indicates that the material composition of different soil layers is highly homogeneous, and the weathering process in the profile develops to the stage of K element migration, characterized by the weathering of Illite and potash feldspar, which is characterized by the weathering of Illite and potash feldspar. 4) the ratio of major elements shows that the ratio curve of elements between the red soil and the weathering crust of Hengshan granite in the happy section is similar, and the range of the ratio of trace element La/Co,Th/Cr and the ratio of fine sediment from acid source is in good agreement. It is suggested that the red soil in the happy section may be homologous to the weathering crust of granite.
【作者单位】：衡阳师范学院城市与旅游学院;西南大学地理科学学院;
【基金】：国家自然科学基金项目(41471153) 湖南省自然科学基金项目(2016JJ6015)资助
【分类号】：S151.1

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