阜平大沙河沿岸黄土组成特征及成因研究

Study on the Component Feature and Formation of the Loess along Da-Sha River Reach in the Fuping region

阜平大沙河段位于太行山中北部地区,黄土类型与西部黄土高原一致,是黄土高原向东延伸的一部分。构成黄土高原的东部边缘,该区黄土复杂多样,厚度变化较大,成点状或片状分布。阜平沙河沿岸阶地之上、山麓背风地带、断裂带出露区发育有厚度不一的黄土层堆积。阜平沙河黄土物质来源复杂、既有西北风搬运来的物质,又有近地表生成的颗粒,堆积期间又经过明显的流水作用的干扰。大沙河黄土、古土壤的堆积、发育与更新世气候变化关系密切,同时又受到本区地貌和构造的影响。

Da-sha river reach in Fuping area is located in the middle-north part of the Taihang Mountain. The local loess type is identical with those of the western loess plateau, and is part of the loess plateau stretched eastwards. As the eastern edge of the loess plateau, the loess of this area is complex and diverse, with obviously varied thickness and punctate or sheet distributions. Loess layers with different thickness are piled up widely on terraces along the Sha River and piedmont leeward zones and fault zones rock outcropped areas. Through the sampiing and research of the loess section, it is conclude that ： the materials of the loess have complex sources, comprising materials transported by northwest wind, and the grains generated form the near-surface. During their accumulation, they were subjected to the affection of water. The accumulation and development of the Fuping loess and paleosol were significantly correlated with Pleistocene climatic variation and were also influenced by local micro-relief and conformation.