地球学报2025，Vol.46Issue(2)：361-375,15.DOI:10.3975/cagsb.2025.012003
山东蓬莱地区第四纪地貌地层与物理地层
Quaternary Geomorphologic Strata and Physical-stratigraphy in the Penglai Region of Shandong Province:Implications for Quaternary Stratigraphic Division in Low Hilly Areas
摘要
Abstract
The Quaternary lithology and lithofacies of low hills in Penglai,Shandong,exhibit diverse variations and unstable thicknesses.The genesis types include slope deposits,alluvial deposits,fluvial deposits,lacustrine deposits,aeolian deposits,and volcanic accumulations.The subdivision of the stratigraphic units poses major challenges and necessitates the use of multiple stratigraphic division methods.Based on the Quaternary geological characteristics of the study area and existing data,a geomorphological stratigraphy and engineering geotechnical stratigraphic division method are proposed alongside chronological and lithostratigraphic divisions.The Quaternary geomorphic development in the study area is divided into four geomorphic periods:the Fenhe erosion-mud bay Period accumulation,Huangshui erosion-Zhoukoudian accumulation,Qingshui ersion-Salawusu accumulation,and last glacial maximum erosion-post-glacial accumulation.Correspondingly,the Quaternary sediments are classified into the FN,HZ,QS,and MB sequences as four geomorphic stratigraphic units.Based on their physical and mechanical properties,the loose Quaternary sediments in the study area were vertically divided into three physical stratigraphic units:A,B,and C.A comparative framework for quaternary chronostratigraphy,lithostratigraphy,geomorphostratigraphy,and physical stratigraphy was established for the Penglai region,enriching the multi-stratigraphic division methods in low hilly areas.This study emphasizes the significance of regional unconformities in the Quaternary stratigraphic divisions of lowhill areas.With comparable formation times,these unconformities serve as stratigraphic units for age stratigraphy at the stratigraphic interfaces.Layered landforms and the cyclic Quaternary sedimentation reflect the phased development of neotectonics and are crucial for studying Quaternary sedimentary environment evolution and the development laws of neotectonic movements in low-hill areas.关键词
第四纪/地文期/地貌地层/物理地层/地层格架Key words
Quaternary/physiographic period/geomorphologic strata/physical-stratigraphy/stratigraphic framework分类
地质学引用本文复制引用
徐华,李秀章,徐建国,黄永波,王玮,刘中业,于得芹..山东蓬莱地区第四纪地貌地层与物理地层[J].地球学报,2025,46(2):361-375,15.基金项目
本文由中国地质调查局地质调查项目(编号:1212011220001 （）
12120114033801)资助. This study was supported by China Geological Survey(Nos.1212011220001 and 12120114033801). （Nos.1212011220001 and 12120114033801）
