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昆明滇池沉积速率的测定
于银亭1, 李培泉1, 吴润2, 孟伟3, 刘玉生3, 邹兰3
1.中国科学院海洋研究所 青岛266071;2.青岛大学化学系 青岛266071;3.中国环境科学院 北京100012
摘要:
于1989年12月采用210Ph法测定昆明滇池（草海和外海）两个柱样的沉积速率，其值分别为0.29cm/a和0.28cm/a，平均值约为0.29cm/a。在沉积柱12cm以上，由于人为影响，其沉积速率没有规律，估计约有30—40年的历史。在12cm以下，210Pbex随深度的变化明显地表现出规律性，以0.29cm/a的速率计算，从12cm到40cm这一段大约有90年的沉积历史。
关键词:  沉积速率  210Pb法  示踪体  衰变  沉积柱
DOI：
分类号:
基金项目:中国环科院资助!890450
DETERMINATIONS OF SEDIMENTATION RATES IN KUNMING'S DIANCHI LAKE
Yu Yinting1, Li Peiquan1, Wu Run2, Meng Wei3, Liu Yusheng3, Zou Lan3
1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;2.Department of Chemistry, Qingdao University, Qingdao 266071;3.Chinese Research Academy of Enviromental Science, Beijing 100012
Abstract:
The sedimentation rates of two sediment cores (Caohai and Waihai) in Kunming's Dianchi Lake determined by 210Pb dating in 1989 are 0.29 cm/a and 0.28 cm/a respectively, and not regular above 12 cm at the two cores due to anthropengenic influence. The sedimentation rates were calculated based on the 210Pb radioactivity’s very regular variation under 12cm of the cores. The sedimentary history was estimated to be about 90 years from 12cm to 40cm of the cores based on the sedimentary rate of 0.29 cm/a.
Key words:  Sedimentation rates, 210Pb dating method, Tracer, Decay, Sediment core
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