新近纪红粘土磁组构特征及其沉积学意义
首发时间:2009-02-04
摘要:通过对第四纪典型风成马兰黄土、受成壤作用影响较大的古土壤层、新近纪红粘土、埋藏化石的红粘土围岩层及现代河流阶地、经流水搬运后再沉积的水成黄土的磁化率各向异性的分析对比,得出新近纪红粘土沉积物的磁组构参数P、F、L、Q值及参数组合特征既具有水动力成因的水成黄土、河流阶地沉积物、埋藏化石的围岩红粘土层的特点,又有部分层段与第四纪风成黄土、古土壤层的磁组构参数及参数组合特征相似,表明新近纪红粘土具有风成原地堆积物沉积的特点,而部分层段又是风动力搬运而来的颗粒经后期流水改造的产物,是风成与水成共同作用的结果。
关键词: 新近纪;红粘土;磁化率各向异性;成因
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Sedimentological Significance of the Magnetic Fabric of Neogene Red Clay in China
Abstract:Based on the the analysis of magnetic fabric of the Quaternary loess- paleosol, neogene red clay, fossil surrounding rock red clay, aquatic loess, Ba River terraces sediments indicates that the magnetic fabric parameters of Neogene Red Clay ,we found that it shows the magnetic fabric parameters (P,F, L, Q )value and parameters combinations characteristics of of Neogene red clay sediments are similar both the characteristics of aquatic loess, river terrace sediments, fossils buried surrounding rock and Quaternary eolian loess-paleosol. Therefore, the formation cause of the neogene red clay is as following, material source is the same as that of quaternary loess, which is induced by eolian transporting, some layer setions are eolian constituent, others experienced rheobiotic reconstruction, which made the eolian transported material of remote derivation re-aggregated.
Keywords: Neogene red clay magnetic fabric genesis
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