| 山东蓬莱地区第四纪地貌地层与物理地层——对低山丘陵区第四纪地层划分的启示 |
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| 关键词:Quaternary physiographic period geomorphologic strata physical-stratigraphy stratigraphic framework |
| 基金项目:中国地质调查局地质调查项目(编号: 1212011220001; 12120114033801) |
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| Quaternary Geomorphologic Strata and Physical-stratigraphy in the Penglai Region of Shandong Province: Implications for Quaternary Stratigraphic Division in Low Hilly Areas |
| The Quaternary lithology and lithofacies of low hills in Penglai, Shandong, exhibit diverse variations and unstable thick-nesses. 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 di-vided 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. Cor-respondingly, the Quaternary sediments are classified into the FN, HZ, QS, and MB sequences as four geomorphic strati-graphic 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 chronostra-tigraphy, 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 uncon-formities 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 sedi-mentary environment evolution and the development laws of neotectonic movements in low-hill areas. |
| XU Hua,LI Xiuzhang,XU Jianguo,HUANG Yongbo,WANG Wei,LIU Zhongye,YU Deqin.2025.Quaternary Geomorphologic Strata and Physical-stratigraphy in the Penglai Region of Shandong Province: Implications for Quaternary Stratigraphic Division in Low Hilly Areas[J].Acta Geoscientica Sinica,46(2):361-375. |
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