| 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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| 引用本文：徐华,李秀章,徐建国,黄永波,王玮,刘中业,于得芹.2025.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[J].地球学报,46(2):361-375. |
| DOI：10.3975/cagsb.2025.012003 |
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| 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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| 中文摘要:山东蓬莱低山丘陵区第四纪地层岩性、岩相多变、厚度不稳定, 成因类型包括坡积、洪积、冲积、湖积、风积和火山堆积, 地层单元划分难度较大, 需要采用多重地层划分方法。依据研究区第四纪地质特征和已有资料, 在年代地层、岩石地层划分的基础上, 提出了地貌地层学、工程岩土学划分方法。研究区第四纪地貌发展划分为汾河期侵蚀-泥河湾期堆积、湟水期侵蚀-周口店期堆积、清水期侵蚀-萨拉乌苏期堆积、末次盛冰期侵蚀-冰后期堆积四个地文期, 相应的将第四纪沉积分为FN序列、HZ序列、QS序列、MB序列四个地貌地层单元; 以第四纪松散沉积的物理力学性质为依据, 将研究区第四纪沉积由上而下划分为A、B、C三个物理地层单元。建立了蓬莱地区第四纪年代地层、岩石地层、地貌地层、物理地层对比格架, 丰富了低山丘陵区第四纪多重地层划分方法。本文强调区域性不整合面在低山丘陵区第四纪地层划分中的重要性, 由于形成时间上具有可对比性, 以其作为分层界面划分的地层单元具备年代地层的含义。层状地貌以及第四纪沉积旋回性是新构造运动阶段性发展的直观体现, 在低山丘陵区第四纪沉积环境演化及新构造运动发展规律研究中将发挥重要作用。 |
| 中文关键词:第四纪 地文期 地貌地层 物理地层 地层格架 |
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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 |
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| Abstract: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. |
| keywords:Quaternary physiographic period geomorphologic strata physical-stratigraphy stratigraphic framework |
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