| 静力触探在莱州湾冰后期三角洲层序地层学研究中的应用 |
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| 关键词:cone penetration test post-glacial delta grain structure sequence stratigraphy paleo water depth |
| 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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| The Application of CPT to the Study of Post Glacial Delta Sequence Stratigraphy in Laizhou Bay |
| Cone penetration test (CPT) is an in-situ test method that is widely used in geotechnical investigation of the coastal zone. The continuity and high resolution of static sounding data have unique advantages in its application to the study of the Late Quaternary stratigraphic structure. In this study, the lithologic logging data and static sounding parameter data of 249 engineering geological holes and cone penetration test hole groups along the coast of Laizhou Bay were comparatively analyzed, and the identification model of static sounding parameter curve for different sedimentary facies of post glacial sedimentation was established. On such a basis and in combination with 14C dating, micropaleontological identification and other data, the sequence stratigraphy of post glacial delta along Laizhou Bay was studied, and system tracts as well as sequence boundaries were identified. This research shows the following phenomena: ① River deltas were developed in all the transgressions along the Laizhou Bay in the late Pleistocene, and the post glacial deltas were the most well-preserved ones with important research value. The coastal post glacial delta area of Laizhou Bay could be divided into two sedimentary zones: the main area and the flanking area, which are obvious different in lithologic characteristics. ② In sequence stratigraphy, the post glacia depositional system tracts along the coast of Laizhou Bay might be divided into the following components: low water level system tracts composed of fluvial facies and littoral lacustrine facies deposits from the last glacial maximum to the early post glacial stage, the positive grain sequence transgressive system tract composed of delta front and tidal flat deposits in the middle of post glacial period, and the high water level system composed of delta front, tidal flat and delta plain deposits in the late post glacial period. ③ The sedimentary environment of the post glacial transgressive area along the coast of Laizhou Bay was tidal flat, and the maximum paleo water depth was less than 10 m during the whole transgression process. |
| XU Jian-guo,LIU Zhong-ye,TAO You-bing,XU Hua,JI Wen-long,ZHANG Chun-chi.2022.The Application of CPT to the Study of Post Glacial Delta Sequence Stratigraphy in Laizhou Bay[J].Acta Geoscientica Sinica,43(1):11-24. |
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