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JI Lihong,LIU Guangshan,CHEN Zhigang,HUANG Yipu,XING Na,JIANG Shan,HE Ming. 2015. Measurement of 129I in ferromanganese crust with AMS. Acta Oceanologica Sinica, 34(10):31－35
Measurement of 129I in ferromanganese crust with AMS
Measurement of 129I in ferromanganese crust with AMS
Received:July 03, 2014  Revised:August 07, 2014
DOI：10.1007/s13131-015-0718-4
Key words:ferromanganese crust  AgI  129I/127I ratio  accelerator mass spectrometry  129I-dating
中文关键词:  ferromanganese crust  AgI  129I/127I ratio  accelerator mass spectrometry  129I-dating
基金项目:The National Natural Science Foundation of China under contract No. 41073044.
Author NameAffiliationE-mail
JI Lihong   
LIU Guangshan  lgshan@xmu.edu.cn 
CHEN Zhigang   
HUANG Yipu   
XING Na   
JIANG Shan China Institutes of Atomic Energy, Beijing 102413, China  
HE Ming China Institutes of Atomic Energy, Beijing 102413, China  
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Abstract:
      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 7×10-14 to 1.27×10-12, 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.
中文摘要:
      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 7×10-14 to 1.27×10-12, 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.
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