郑州市第四纪沉积地层的三维空间分布规律

3D spatial distribution of Quaternary sedimentary strata in Zhengzhou

郑州市第四纪沉积地层的空间分布特征与规律研究,与探明人类早期文明在黄河沿岸,特别是在郑州周边地区的诞生和发展关系密切,对现代城市规划布局、地下空间开发利用以及黄河生态保护与高质量发展也具有重要的支撑作用。为此,郑州市开展了地质旅游与地质文化资源调查工作,在主城区及周边不同地貌单元的第四纪沉积覆盖区实施了38个沉积钻孔,其中有9个为钻穿第四系的深部钻孔。根据深部钻孔分析,结合已有的HKGA孔勘探成果,在准确划分各钻孔第四纪沉积地层结构的基础上,分别建立了各种地貌单元的标椎地层柱;通过分析对比这些不同地貌单元沉积地层的变化特征,取得了在东部平原区早更新世与中更新世普遍存在风成沉积,晚更新世转为河流与湖沼相沉积的认识和实证;沉积物物源特性分析结果,从侧面证实了黄河沉积物在区内的沉积时间可能始于晚更新世时期。

The study of the spatial distribution characteristics and law of Quaternary sedimentary strata in Zhengzhou is closely related to the birth and development of early human civilization along Yellow River,especially in the surrounding areas of Zhengzhou.And,it also plays an important supporting role in modern urban planning and layout,underground space development and utilization,as well as the ecological protection and high-quality development of Yellow River.Thus,the geological tourism and geological cultural resources survey was carried out in Zhengzhou,and 38 sedimentary boreholes were drilled in the main urban area of Zhengzhou and different geomorphic units around it,including 9 deep boreholes exposing Quaternary period.Based on the results of deep drilling and existing HKGA borehole exploration results,the authors established the standard stratigraphic columns of various geomorphic units,through accurately dividing the Quaternary sedimentary stratigraphic structure of each borehole.By analyzing and comparing the changing characteristics of sedimentary strata in these different geomorphic units,the authors obtained the understanding and empirical evidence,that is aeolian sedimentation was commonly present in Early and Middle Pleistocene in the eastern plain area,and it transformed into river and lacustrine facies sedimentation in Late Pleistocene.Based on the analysis of sediment source characteristics,it has indirectly confirmed that the sedimentation time of Yellow River sediment in this area may have started from the Late Pleistocene period.