基于释光技术的全新世苏北平原埋藏潮成砂体演化研究

海岸潮成砂体是气候、海平面变化、潮流、泥沙供应等因素作用的产物，是研究陆海相互作用的理想载体。苏北埋藏潮成砂体与江苏海岸平原的发育密切相关，但迄今为止，仍缺乏系统的年代学研究，其物质来源也存在争议，制约了对其演化过程和机制的认识。本项目利用石英光释光技术，结合AMS14C测年，发展海岸砂体沉积物的定年方法；尝试将释光信号特征与地球化学、环境磁学、矿物分析等方法相结合，对苏北埋藏潮成砂体的物源进行综合分析。通过将年代学与物源分析相结合，揭示苏北埋藏潮成砂体发育过程，及其对全新世海平面变化、海岸泥沙供应、海洋动力的响应机制，为理解苏北埋藏潮成砂体发育机制和海岸变迁提供科学依据。

Coastal tidal sand body is formed under the interaction of climate, sea-level change, tidal currents and sediment supply, which records the information of land-sea interaction. The buried tidal sand body on the coastal zone of northern Jiangsu Province is closely related to the coastal plain evolution. However, there is a lack of systematic chronological study of the sand body, and its provenance remains controversial. This limits our understanding of the formation mechanism of the tidal sand body. In this study, optically stimulated luminescence (OSL) dating technique will be used together with AMS14C to develop reliable dating methodology for coastal sandy deposits. Meanwhile, in combination with geochemical, environmental magnetic and mineral analysis, the characteristics of luminescence signal from different particle-size fractions of quartz will be used to tracing sediment provenance. By integrating chronology and sediment provenance analysis, this project will reveal the process of the tidal sand body and its response to Holocene sea-level change, sediment supply and marine hydrodynamics. This will deepen our understanding on the formation mechanism of tidal sand body and coastal evolution.