胶州湾铅-210比活度的分布模式及百年尺度的沉积速率  

Specific activity distribution patterns of lead-210 and sediment accumu-lation rates in the Jiaozhou Bay in Shandong Province,China

作　　者：刘运令[1] 汪亚平[1] 高建华[1] 贾建军[2] 夏小明[2] 

机构地区：[1]南京大学地理与海洋科学学院海岸与海岛开发教育部重点实验室,江苏南京210093 [2]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《海洋学报》2010年第1期83-93,共11页

基　　金：国家"九○八"专项资助(908-02-03-08);教育部"新世纪优秀人才支持计划"资助(NCET-06-0446)

摘　　要：2006年6月在胶州湾采集柱状岩心并对岩心沉积物中铅-210比活度进行测试分析,结果表明,铅-210沿岩心的垂向分布具有两段、三段模式和异常的多段、倒置模式等。基于铅-210的CIC（constant initial concentration）计年模式和铯-137时标,并且结合历史海底地形对比,计算出近百年来胶州湾海域的现代沉积速率为1.49~24.96 mm/a,沉积通量为0.17~2.62 g/（cm2.a）。除沧口水道末端个别区域外,胶州湾多数区域（包含水道）的沉积速率较低,量级为100mm/a,湾内水道主要呈现出微淤甚至侵蚀,表明近百年来胶州湾沉积环境相对稳定,在可作为航道资源的湾内水道并未出现显著淤积。Column-like cores were collected in the Jiaozhou Bay in June 2006 and the lead-210 specific activity was measured in the sediments of these cores.The results show that there are four types of vertical distribution patterns of lead-210 specific activity,i.e.,the two-section,three-section,multisection and reversed-section patterns.Based on the CIC（constant initial concentration） model,the deposition rates and the depositonal fluxes are estunated as 1.49~24.96 mm/a and 0.17~2.62 g/（cm2 a）,respectively.The magnitude of the accumulation rate is 100 in the study area.A slight sedimentation or even partial erosion occur in the deep channels in the bay.It indicates that the sedimentary environment is relatively stable in the Jiaozhou Bay during the past century.

关 键 词：岩心沉积物 铅-210测年 沉积速率 航道资源 胶州湾 

分 类 号：P736.21[天文地球—海洋地质]