| 海岸带地区137Cs沉积剖面类型划分及其意义 |
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| 引用本文： | 王 福,王 宏.海岸带地区137Cs沉积剖面类型划分及其意义[J].地质通报,2011,30(7):1099-1110. |
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| 作者姓名： | 王 福 王 宏 |
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| 作者单位： | 中国地质调查局天津地质调查中心,天津,300170 |
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| 基金项目： | 中国地质调查局国土资源大调查项目《中国泥质海岸带对全球变化响应的研究与趋势预测》 |
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| 摘 要： | 作为一种人工核素,<'137>Cs年代学方法已在海岸地区得到广泛应用,并成为重建现代地质过程的重要方法.搜集了海岸带地区报道的200余组<'137>Cs沉积剖面数据(其中中国海岸带地区121个站住,其它地区100余站位),通过对<'137>Cs沉积剖面形态的分析.并与理想<'137>Cs沉积剖面对比研究,结果显示,海岸...
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| 关 键 词： | 137Cs 沉积剖面 沉积过程 海岸带 |
The division of 137Cs vertical profile types on coastal area and its implications |
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| WANG Fu,WANG Hong.The division of 137Cs vertical profile types on coastal area and its implications[J].Geologcal Bulletin OF China,2011,30(7):1099-1110. |
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| Authors: | WANG Fu WANG Hong |
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| Institution: | Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China |
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| Abstract: | As an anthropogenic radionuclide, the 137Cs tracer dating method has been widely used in coastal areas, and has served as an important means for reconstructing modern geological processes. Based on an analysis of the shape of the 137Cs vertical profiles and a comparison with ideal 137Cs vertical profiles, the authors collected more than 200 137Cs vertical profiles, which included 121 stations in China's coastal areas, and more than 100 stations in other areas of the world. The results show that there exist six main types, i.e., (1) discontinuous 137Cs curves, (2) continuous 137Cs curve without characteristic peak, (3) characteristic peak on the lower part of the continuous 137Cs curve, (4) characteristic peak on the upper part of the continuous 137Cs curve, (5) increasing activity of 137Cs with depth, and (6) decreasing activity of 137Cs with depth. The main 137Cs vertical profiles reflect a variety of sedimentary environments and imply that the main factors controlling the profiles of 137Cs are erosion, mixing and sediments supply; The key points of the application of 137Cs are undisturbed sampling and the consideration of the influence of sampling resolution on the interpretation of the data. In the coastal area without atmosphere fallout monitoring, the profile in a relative stable environment could serve as a background reference for tidal flat and shallow sea area. |
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| Keywords: | 137Cs vertical profile deposition processes coastal area |
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