Measurement of 129I in ferromanganese crust with AMS

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• 作者：Lihong Ji ; Guangshan Liu ; Zhigang Chen ; Yipu Huang ; Na Xing…
• 关键词：ferromanganese crust ; AgI ; 129I/127I ratio ; accelerator mass spectrometry ; 129I ; dating
• 刊名：Acta Oceanologica Sinica
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：34
• 期：10
• 页码：31-35
• 全文大小：212 KB
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• 作者单位：Lihong Ji (1)
  Guangshan Liu (1)
  Zhigang Chen (1)
  Yipu Huang (1)
  Na Xing (1)
  Shan Jiang (2)
  Ming He (2)
  
  1. College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361102, China
  2. China Institutes of Atomic Energy, Beijing, 102413, China
  
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

In the present study, the analytical method for 129iodine (129I) in ferromanganese crusts is developed and 129iodine/127iodine (129I/127I) ratio in ferromanganese crusts is measured by the accelerator mass spectrometry (AMS). The developed method is applied to analyze 129I/127I ratio in two ferromanganese crusts MP5D44 and CXD08-1 collected from the Mid-Pacific Ocean. The results show that 129I/127I ratio in MP5D44 and CXD08-1 crusts varies from 7×10-4 to 1.27×10-2, with the lowest value falling on the detection limit level of AMS reported by previous literatures. For the depth distribution of 129I/127I, it is found that both MP5D44 and CXD08-1 crusts have two growth generations, and the 129I/127I profiles in two generations all displayed an approximate exponential decay. According to the 129I/127I ratio, the generate age of bottom layer of MP5D44 and CXD08-1 was estimated to be 54.77 and 69.69 Ma, respectively. Keywords ferromanganese crust AgI 129I/127I ratio accelerator mass spectrometry 129I-dating