黄山第四纪泥砾沉积物分形结构特征与沉积环境分析

黄山第四纪泥砾沉积物粒度组成的分维值介于２．７０８￣２．７５３之间，非常接近古泥石流堆积物粒度组成的典型分维值２．７５。结合沉积特征，表明该类沉积物属第四纪间冰缘环境下的稀性泥石流沉积，其形成过程与季风型冰缘环境有关，是两种环境综合作用的结果。

ANALYSIS ON THE FRACTAL STRUCTURE FEATURES AND SEDIMENTARY ENVIRONMENT OF THE BOULDER CLAY OF THE QUATERNARY IN MT. HUANGSHAN

The boulder clay of the Quaternary in Mt. Huangshan is distributed mainly at the foot of the mountain and its elevation is 400-800 m a.s.l. The idea on the formation of the sediments have different explanations. In this paper, the author analyses the fractal structure features of the sediments of the Quaternary in Mt. Huangshan based on the fractal theory. The fractal dimension changes from 2.708 to 2.753. The value is very closed to the fractal dimension of the sediments of ancient debris flow (2.75). The fractal dimension of the non cohesive debris flow is over 2.6. So, the sediments of the Quaternary in Mt. Huangshan is ancient non cohesive debris flow. According to the feature of the sediments, the climate was warm and wet during its deposition. The environment of Mt. Huangshan during the glacial epoch of the Quaternary was the periglacial environment of the monsoon type. The ancient non cohesive debris flow was the sediments of the interperiglacial environment of the monsoon type. Its formation had relationship with the perigalcial environment of the monsoon type.