渤海湾老狼坨子海岸带^(14)C、^(137)Cs、^(210)Pb测年与现代沉积速率的加速趋势  

^(14)C, ^(137)Cs and ^(210)Pb dating and accelerated tendency of the present sedimentation rate along the Laolangtuozi coast of the Bohai Bay

作　　者：王宏[1] 姜义[2] 李建芬[1] 夏威岚[3] M.Van Strydonck S.L.Goodbred 康慧[1] 

机构地区：[1]中国地质调查局天津地质矿产研究所,天津300170 [2]中国地质调查局,北京100035 [3]中国科学院地理与湖泊研究所,江苏南京210008 [4]Royal Institute for Cultural Heritage [5]State University of NewYork

出　　处：《地质通报》2003年第9期658-664,共7页Geological Bulletin of China

基　　金：泥质海岸带现代地质作用(沉积;剥蚀及岸线变迁)与精细测年研究(编号:0100201094)。

摘　　要：通过对渤海湾西岸L剖面中同一关键层的碳酸钙和原生腹足类壳体的14C测年对比研究,确定了晚全新世约2800calBP的层位及沉积速率0.045cm/a;8个样柱的137Cs和210Pbexc强度、蓄积量揭示了距今约120年来堤后盐沼的平均沉积速率约为0.35cm/a,而面向开放海湾的潮坪上部则达到约2～3cm/a。研究区近1个世纪以来沉积速率的加速趋势,是渤海湾西岸泥质海岸带的特征之一。C dating comparative study of the calcium carbonate and insitu gastropods in the same key layer in transect L on the west coast of the Bohai Bay has determined the late Holocene ～2800 cal BP horizon and the sedimentation rate of 0.045 cm/a. The 210Pb and 137Cs data and inventories of eight columns, combined with the radiocarbon ages, reveal that the average sedimentation rate in the last ～120 years is ～0.35cm/a for the back-marsh and ～2-3cm/yr for the upper part of the open intertidal flat. The acceleration trend of the sedimentation rate in the study area over nearly a century is one of the features of the muddy coastal zone of the Bohai Bay. has existed in the transect L in the back-marsh and intertidal area in Laolangtuozi, Bohai Bay.

关 键 词：^14C测年 ^137Cs/^210Pb测年 沉积速率 加速 渤海湾西岸 

分 类 号：P597[天文地球—地球化学] P512.2[天文地球—地质学]