基于释光测年的晚全新世福建东南海岸沙丘演化序列研究

项目名称： 基于释光测年的晚全新世福建东南海岸沙丘演化序列研究

项目编号： No.41301012

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 靳建辉

作者单位： 福建师范大学

项目金额： 28万元

中文摘要： 全新世晚期是全球海岸沙丘广泛发育的典型时期，海岸沙丘记录了海岸带以风力作用为主的沙丘动力地貌系统和以波浪作用为主的水动力地貌系统的耦合演变过程，反映了陆-海-气之间复杂的相互作用。因此，海岸沙丘中蕴含着丰富的气候变迁、海平面变化、新构造运动、环境考古信息。福建东部沿海深受东亚季风系统演变影响，是记录海陆交互作用和全球变化的敏感地带，因此，本项目以福建东南沿海砂质海岸带的海岸沙丘为研究对象，选择典型海岸沙丘沉积剖面，通过GPR探测技术,并结合人工探槽和天然剖面露头观测海岸沙丘沉积构造，划分海岸沙丘沉积序列；采用OSL测年技术，结合AMS14C测年校验，确定海岸沙丘发育年代框架；对典型海岸沙丘较高密度采样，进行粒度参数实验和成因分析。以典型海岸沙丘的年代框架为基础，通过区域和东亚海岸带海岸沙丘沉积序列对比，重建研究区晚全新世以来海岸沙丘的演化序列,探讨区域海岸沙丘演化序列的影响因素和动力机制。

中文关键词： 光释光；全新世；海岸沙丘；人类活动；环境演变

英文摘要： The late Holocene is a typical formation period of the coastal dune in the globe. Coastal dune deposition record the coupled process between the dune and water dynamic geomorphology system, formed by wind transport and wave action, respectively, and also reflect the complex interaction among land surface, atmosphere and ocean, therefore, coastal dune deposition include abundant information of climate change, sea level eustacy, Neotectonic movement and environmental archaeology. The eastern coastal of Fujian is a sensitive region of recording the global change and interaction of sea and land, located between the Pacific plate and Eurasian plate, deeply influenced by the evolution of East Asian monsoon. Thus, this project study the typical profile of coastal dune deposition and distinguish the sedimentary sequence, through the ground-penetrating radia method to detecting the sedimentary structure, combined with the field observation of natural outcrop section. The chronological framework will be constructed by optically stimulated luminescence(OSL) dating ,and the AMS14C dating will be used to test the reliability of OSL dating datas. In the mean while, the grain-size analysis with high density sampling will be devoted to distinguish the formation of different layer of the coastal dune. Then, based on the

英文关键词： OSL；Holocene；coastal sand dunes；human activity；environmental change