Sedimentological Significance of the Magnetic Fabric of the Neogene Red Clay in Lingtai,Gansu Province
Sedimentological Significance of the Magnetic Fabric of the Neogene Red Clay in Lingtai,Gansu Province
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DOI：
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发表时间：
2007
影响因子：
11.8
通讯作者：
Wang Wei
中科院分区：
文献类型：
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作者：
Wang Wei
对马兰黄土、风化成土作用强烈的第五层古土壤、红粘土和基质的磁组构分析表明，新近系红粘土的F值介于第五层古土壤马兰黄土与基质之间，其重叠边界为F=1.01 L的平均值与风成黄土相当，Q的平均值与马兰风成黄土相似，在磁组构参数组合图上，红粘土的磁组构参数与水力成因的基质红粘土的磁组构参数近似对应，处于过渡区，说明红粘土的磁组构参数组合图与水力成因的基质红粘土的磁组构参数基本一致，粘土沉积物具有类似于未经历搬运的风成沉积物的磁组构值特征和经历水力改造的化石包埋岩特征，从而得出红粘土是原生风成颗粒经过沉积后水力作用的产物的结论。
The analysis of magnetic fabric of the Malan loess,the fifth layer of paleosol which is well-known for its intensity of weathering and pedogenesis,red clay and matrix indicates that the magnetic fabric parameters P,F of Neogene Red Clay are between Malan loess-the fifth layer of paleosol and matrix with the overlapping boundary as the equation ”F=1.01”.The average value of L is equal to that of the eolian loess while the average value of Q,which is similar to that of the eolian Malan loess from the aspect of event deposition,approximately corresponds with that of the matrix red clay of hydraulic genesis and is in the transition area when it is in the assembled diagram of magnetic fabric parameters.All above show that the red clay deposits have the similar characters of magnetic fabric values resembling those of eolian deposits without experiencing transportation and also the features of shrouding rock of the fossils undergoing the hydraulic reconstruction thus the conclusion can be reached that red clay is the product of the primary aeolian particles which go through the post-depositional hydraulic process.