WANG Ai-jun, GAO Shu, Chen Jian. APPLICATION OF 137Cs CHRONOLOGY TO COASTAL SALT MARSHES[J]. Marine Geology & Quaternary Geology, 2006, 26(5): 85-90.
Citation: WANG Ai-jun, GAO Shu, Chen Jian. APPLICATION OF 137Cs CHRONOLOGY TO COASTAL SALT MARSHES[J]. Marine Geology & Quaternary Geology, 2006, 26(5): 85-90.
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APPLICATION OF 137Cs CHRONOLOGY TO COASTAL SALT MARSHES

  • 1 Open Lab of Ocean & Coast Environmental Geology, Third Institute of Oceanography, SOA, Xiamen 361005, China;

  • 2 Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China

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  • Received Date: March 10, 2006
  • Revised Date: May 23, 2006
    Graphical Abstract
    • Abstract
  • Salt marshes are a widespread coastal and estuarine environment,and geomorphologically are composed of an approximately leveling,vegetated platform dissected by network of typically blind-ended channels. It is important for studying the depositional processes and sedimentation rates to understand deeply the interaction between human activities and coastal system. 137Cs chronology is an effective technique for studying modern sedimentation rates since 20 years. 137Cs is an artificial radioactive isotope introduced into the natural environment since the start of the atmospheric nuclear weapon testing in the 1950s. 137Cs can be exchanged and adsorbed in the surface sediment and buried through the air-water interface and water-sediment interface,and four dating markers(1954,1963,1974 and 1986)which correspond to the onset and peaks discharge of 137Cs can be identified and the sedimentation rates in different periods can be calculated. 137Cs chronology is used widely to study sedimentation rates in lakes,continental shelves,bays and tidal flats,and gives better study results. The 137Cs chronology needs high stability of strata in study area,and its concentration is influenced by clay content and sorting degree of sediments. The root system of the salt marsh vegetation can extend deeply downwards and disturb the stratum sequence. Then it is difficult to identify the characteristic peak,and thus other techniques are needed to do comprehensive estimation.
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    • References (36)
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