南海北部晚全新世高海平面及其波动的海滩沉积证据  

Beach sediments from northern South China Sea suggest high and oscillating sea level during the late Holocene

作　　者：余克服[1] 陈特固[1] 

机构地区：[1]中国科学院南海海洋研究所,广东广州510301

出　　处：《地学前缘》2009年第6期138-145,共8页Earth Science Frontiers

基　　金：中国科学院知识创新工程重要方向性项目(kzcx2-yw-318);国家自然科学基金项目(40830852;40572102);国家重点基础研究发展计划"973"项目(2007CB815905);ARC课题(DP0773081)

摘　　要：揭示晚全新世以来的海平面变化过程对于理解海平面所处的现状和变化的趋势等具有重要意义。构造活动相对稳定的雷州半岛珊瑚礁区蕴藏着丰富的海平面变化信息,文中对该区晚全新世发育的海滩沉积序列研究表明,距今约1.7～1.2Cal.kaBP(14C年代为2.1～1.7kaBP)期间总体上是一个海平面持续上升的时期,其中在距今约1.5Cal.kaBP时海平面有过短暂的下降波动,约1.2Cal.kaBP时的海平面比现在的至少高128cm;之后海平面开始下降,至今海岸线后退了约210m,形成现代海滩-沙堤地貌体系。结合本区珊瑚礁记录的全新世其他时段海平面的变化特征,本文认为全新世海平面与气候变化一样,也存在千年、百年、年代际尺度的波动特征。Reconstruction of the late Holocene sea-level changing process is significant for understanding the current situation and the future trend of the present sea level.Leizhou Peninsula located in the northern coast of the South China Sea is an ideal site for studying the Holocene sea-level history because of its tectonic stability and its possession of numerous sea-level indicators.Beach sediment from this site suggests that from 1.7-1.2 Cal.ka BP（or ^14C ages from 2.1 to 1.7 ka BP）it was an overall sea level rising period with a short-term sea-level dropping punctuation occurred at -1.5 Cal.ka BP.The sea-level at 1.2 Cal.ka BP was at least 128 cm higher than the present one,and then it started to decline some time later,which resulted in the retreat of the coastline by about 210 m and the formation of the present beach-sand bank system.Associating with other evidences from coral reefs at this site,we believe that the sea level,just like climate,oscillated at millennial-,centennial-and interdecadal-scale cycles over the Mid-late Holocene.

关 键 词：海平面 晚全新世 波动 海滩沉积 珊瑚礁 南海 

分 类 号：P534.632[天文地球—第四纪地质学] P736.21[天文地球—古生物学与地层学]