浅覆盖区第四系三维立体透视方法研究--以太湖西北地区为例

采用剖析图法从三维透视角度研究了太湖西北地区浅覆盖区第四系。该剖析图较直观、清晰地展示了新近纪、第四纪各地层的岩性、厚度、沉积结构特征及其在三维空间的变化，并可反映当时的沉积环境及阶地上的岩性分布，同时显示了基底(前新近系)的起伏变化特征，为该区新构造运动的研究、区域地层的对比以及建立该区沉积结构模型等提供了新的视角和较全面的基础地质资料。在简要介绍了剖析图方法的同时，着重强调要通过柱状地层对比，进行第四纪地层的多重划分，确定第四纪地层划分原则。

Study on the 3D Perspective Method for the Areas with Shallow Quaternary Cover:Taking the Northwest of the Taihu Lake as an Example

Using the method of the anatomic drawing, the authors studied the shallow Quaternary cover in the northwest of the Taihu Lake from an angle of 3D stratigraphic perspective. The anatomic drawing expresses the lithological characteristics, thickness and sedimentary structural features, especially the 3D changes of the Neogene and Quaternary systems intuitvely. In this way, we could recognize the environment at the time of deposition and the lithological distribution on the terraces. In the meanwhile, it can show the features of uplift and sybsidence of the basemesnt during the early Neogene. Even more, the drawing provides a new method and steady basic geological data to research the neotectonic movements, correlate the strata and establish the depositional structural model of the area. It should be emphasizd that the stratigraphic correlation and the multiple subdivision of the Quaternary system are essential for this method.