| 河口港湾沉积物中的(137)Cs剖面及其沉积学意义 |
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| 引用本文： | 潘少明,李炎.河口港湾沉积物中的(137)Cs剖面及其沉积学意义[J].沉积学报,1997,15(4):67-71. |
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| 作者姓名： | 潘少明 李炎 |
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| 作者单位： | 1 南京大学海岸与海岛开发国家试点实验室,南京 210093; |
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| 基金项目： | 南京大学海岸与海岛开发国家试点实验室资助项目(编号:SCIEL21196119) |
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| 摘 要： | 本文通过对采自海南岛洋浦港?福建厦门外港?浙江象山港三个河口港湾的六个沉积柱样的137Cs分析,分别用137Cs剖面的最大峰值层及137Cs剖面的起始值层位估算了该六个站位的现代沉积速率,结果表明:在河口港湾沉积环境条件下,用137Cs剖面来估算沉积物的平均沉积速率是可行的,由137Cs最大值法,这六个站位的平均沉积速率分别为1.14cm/a?1.56cm/a?0.82cm/a?0.75cm/a?1.26cm/a?1.66cm/a,由137Cs最大值法得出的平均沉积速率其精确度与可信度要好于137Cs起始值得出的平均沉积速率?与210Pb法所得的结果符合的很好?137Cs起始值层位与预期值偏离的大小可以为我们提供有关该站位沉积环境?扰动作用强弱的信息?在应用137Cs剖面估算沉积速率时,还要注意沉积结构变化的影响?
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| 关 键 词： | 河口 沉积速率 （137）Cs |
| 收稿时间： | 1996-06-12 |
Cs-137 Profile in Sediments in Estuaries and Its Application in Sedimentology |
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| Institution: | 1 State Pilot Laboratory of Coast & Island Exploitation,Nanjing University,Nanjing,210093;2 Second Institute of Oceanography,State Oceanic Administration,Hangzhou,310012;3 Department of Physics,Nanjing University,Nanjing,210093 |
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| Abstract: | Six sediment cores, collected in Yangpu Harbour on Hainan Island, Out of Xiamen Harbour in Fu-jian Province and Xiangshan Harbour in Zhejiang Province, were analyzed for Cs- 137 activity, both theposition of the peak (corresponding to the period of maximum deposition) and the position of the horizon(corresponding to the first appearance of Cs- 137 in the environment)were been used to determine sedi-mentation rates.The results showed that it is possiable to use the Cs- 137 profile to determine sedimen-tation rate in estuaries, Rates for these cores based on the position of peak of Cs- 137 profile were 1.14cm /a, 1.56cm /a, 0.82cm /a, 0.75cm /a, 1.26cm /a, respectively.1.66cm /a, which are in good agreementwith that based on Pb- 210 dating and rates based on the occurrence of the horizon were larger than thatbased on Pb- 210 dating, Nhieh this indicates physical mixing or reworking of seidments in estuaryies. |
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