^(210)Pb、^(137)Cs计年法在现代海岸带沉积速率研究中的应用述评  

An Overview on the Application of ^(210)Pb and ^(137)Cs Dating in the Research of Recent Sediment Accumulation Rate of Coastal Zone

作　　者：孙丽[1] 介冬梅[2] 濮励杰[1] 

机构地区：[1]南京大学地理与海洋科学学院,南京210095 [2]东北师范大学城市与环境科学学院,长春130024

出　　处：《地理科学进展》2007年第2期67-76,共10页Progress in Geography

基　　金：江苏省自然科学基金(BK2005080);国家自然科学基金(40371106);教育部"跨世纪优秀人才培养计划"基金(2003)

摘　　要：210Pb、137Cs计年法已被国内外广泛用于湖泊、河流和海洋现代沉积速率的研究中。本文在回顾了210Pb、137Cs计年法应用于海岸带沉积速率研究的现状以及存在问题的基础上,根据海岸带沉积环境特征分析了210Pb、137Cs计年法在应用中应当注意的问题,包括采样精准性,样品分离的分辨率,数据校正方法的选择及两种方法的相互印证等。从几个方面探讨了提高沉积速率测定精度的可能性,同时指出,210Pb、137Cs的扩散混合模型的建立,137Cs沉积滞后的问题,以及137Cs、210Pb计年法的应用范围等仍有待深入探讨。^210Pb and ^137Cs techniques can be used to infer a geochronology with incomparable superiority in accuracy and timescale, which were widely employed for dating recent sediments deposited in fluvial, lacustrine, marine and other sedimentary systems on a timescale of about 100 years. The achievements and current situation of 210pb and 137Cs dating in the coastal zone of China were summarized, which were in the primary stage when compared with the same kind of achievements overseas. Based on the characters of the sedimentary environment in the coastal zone, the problems and limitations of 210pb and 137Cs dating for sedimentary rate were revealed, indicating that undisturbed sampling, high-precision sampling and partition, moderate adjustment, accurate descriptions of the regional distribution patterns of 210Pb and 137Cs concentration and comparison of 210pb method with 137Cs time-mark counting were very important for correcting results. Further analysis of the model establishment for diffusion and mixing of 210Pb and 137Cs techniques was required. Referring to foreign research, the needs of some further improvements and some additional intensive work, especially in the coastal zone of China, were also suggested.

关 键 词：z Opb -优s计年 现代沉积速率 海岸带 

分 类 号：TV148[水利工程—水力学及河流动力学] P736.2[天文地球—海洋地质]