中文摘要：

海平面上升造成的一个直接后果就是沿海盆地发生海侵事件，可能给低海拔沿海城市带来灾难，因此地质时期的海平面升降一直是学术界研究的热点。本文通过对福建霞浦钻孔沉积物进行详细的环境磁学参数测试和AMS 14C定年，并结合岩性描述及前人对福建沿海全新世以来海平面波动曲线的重建结果，探讨了约7800a B.P.以来研究区海平面波动的磁学记录。研究表明，钻孔沉积物中的主导磁性矿物为陆源碎屑磁铁矿。当海平面上升时，沉积区水动力条件减弱，陆源碎屑物质输入量减少，沉积物以浅海相淤泥为主，κ、ARM及SIRM值很低，TOC含量升高；当海平面波动下降时，沉积区水动力条件加强，陆源碎屑物质输入量增加，沉积物以潮滩相含中粗砂沉积为主，κ、ARM及SIRM值升高，TOC含量下降。结果表明磁学参数可以很好地响应海平面上升过程中次一级波动变化，但是不同的研究区海平面升降的磁学响应不同，在使用时应当谨慎。此外，本文的研究结果与前人对研究区重建的海平面变化曲线相比存在一定的差异，可能是由于定年手段及研究材料的不同或区域性差异造成的。

英文摘要：

Transgressions of sea-level rise in the coastal areas can cause disasters to the foreland cities, so the study of sea-level changes is a focus of scientific research all over the world.In the past decades, the sea-level fluctuations detected from Fujian coastal areas since Late Quaternary attracted more and more attentions, several curves of sea-level changes have been reconstructed by using different methods.However, there is few works focus on the magnetic properties.In order to reveal how the magnetic parameters response to the sea-level fluctuation, a 105.19-m-long core was obtained at Xiapu （26°53＇21.78＂N, 120°02＇22.96＂E） which located in the northern Fujian, and the total recovery of the core was ca.74% （i.e. the actual length of sediment is 78.78m）.In this work, pilot samples from 2.88~13.70m（about 550~7800a B.P.AMS 14C age） with a recovery of more than 95% were collected.According to the sedimentary facies and diatom data, the studied core can be divided into three parts：13.70~8.33m （shallow marine deposits）, 8.33~6.59m（tidal flat deposits） and 6.59~2.88m （shallow marine deposits）.Detailed magnetic parameters （such as κ, ARM, IRM, κ-T curves, hysteresis loops and so on）and the concentration of total organic carbon（TOC）were measured.Moreover, combined with AMS 14C dating, sedimentary facies and the reconstructed sea-level fluctuation curves in the previous works, the magnetic responses to sea-level changes since about 7800a B.P.were studied.The results show that the main magnetic mineral in the sediments is detrital magnetite, besides, κ, ARM and SIRM decreased when the sea-level raised（i.e. shallow marine deposits）, while these values increased when the sea-level declined （i.e. tidal flat deposits）.The relationships among κ, ARM, SIRM, κfd% and ARM/κ are various in different sedimentary facies, which indicates different concentrations of magnetite deposited during various sea-level stages.The main reason is probably related to the distance between