基于地层结构组合的第四纪地质单元划分研究——以皖江经济带沿江丘陵平原区为例

为支撑地质条件复杂地区的水文地质、工程地质和环境地质调查研究,在皖江经济带沿江丘陵平原区通过系统分析第四纪地层的岩性、结构、构造等组合,以地貌以及第四系成因、沉积相和沉积物物源为指标,结合已有区域第四纪研究成果以及年代地层和岩石地层划分标准,进行皖江沿江丘陵平原区“第四纪地质单元”划分,共划分出冲积-湖积平原地质单元、洪积-坡积岗地地质单元和残积-剥蚀丘陵地质单元3个一级地质单元,总结了7种类型第四纪地层结构组合及其特征,为区域水文地质和工程地质调查与研究奠定了基础。

Division of Quaternary geological units based on stratigraphic architecture combination: A case study in Wanjiang River Economic Zone

In order to support the geological investigation and research of hydrological engineering environment in the areas with complicated geological conditions, the authors analyzed systematically the lithology, architecture and structure of Quaternary strata in hilly plain areas of Wanjiang River Economic Zone. Taking the geomorphology, Quaternary genesis, sedimentary facies and sediment provenance as the indexes, combined with the existing regional Quaternary research achievements and the classification of chronostratigraphy and lithostratigraphy, the authors carried out the division of Quaternary geological units in hilly plain areas along Wanjiang River. The hilly plain areas were divided into three first-level geological units, namely, alluvial-lacustrine plain geological units, flood-slope hilly geological units and residual-denuded hilly geological units. Seven types of Quaternary stratigraphic structure combinations and their characteristics are summarized. This study can lay a foundation for regional hydrogeological and engineering geological survey and research.