杭嘉湖平原第四纪地层高精度对比方法研究

通过标准孔古气候旋回宏观识别标志的研究,并运用高分辨率层序地层理论,解决了杭嘉湖平原第四纪地层划分和200余个钻孔的等时对比问题,在此基础上制作了高精度对比的剖面图及准瞬时岩相古地理图,为研究杭嘉湖平原第四纪地层划分、古地貌变迁提供了更为精确的资料。运用“基准面旋回”作为层序地层的划分依据,以古土壤层及其可与之对比的暴露面和河流冲刷面为边界,将平原第四系划分为9个亚层序,并发现亚层序与气候旋回呈耦合关系。

High-resolution stratigraphic correlation method of the Quaternary in the Hangzhou-Jiaxing-Huzhou plain

Through studying the macroscopic recognition mark of paleoclima ti c cycles from standard strati-graphic holes and using the theory of high-reso lution sequence stratigraphy,the authors solved the prob-lems of stratigraph ic division of the Quaternary and isochronous correlation of over200holes in the Hangzhou-Jiaxing-Huzhou plain.On that basis,the authors constructed high-precision correlative sections and a quasi-instant lithofacies-paleoge ographic map,which offer more precise information for the study of the strati graphic division of the Quaternary and palaeogeomorphologic change of the plai n.Using the"base-level cycles"as the basis for the sequence stratigraphic d ivision and treating the paleosol layer and its correlative exposure surface an d river erosion surface as the boundary,the authors divide the Quaternary of t he plain into nine subsequences and find that the subsequences can be coupled wi th the climatic cycles.