| JI Lihong,LIU Guangshan,HUANG Yipu,XING Na,CHEN Zhigang. 2015. The distribution of iodine and effects of phosphatization on it in the ferromanganese crusts from the Mid-Pacific Ocean. Acta Oceanologica Sinica, 34(8):13－19 |
| The distribution of iodine and effects of phosphatization on it in the ferromanganese crusts from the Mid-Pacific Ocean |
| 中太平洋铁锰结壳碘分布及磷酸盐化对其影响 |
| Received:February 09, 2014 Revised:June 04, 2014 |
| DOI：10.1007/s13131-015-0704-x |
| Key words:ferromanganese crust iodine phosphatization Mid-Pacific Ocean two-stage distribution |
| 中文关键词: 铁锰结壳 碘 磷酸盐化 中太平洋 两段式分布 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | JI Lihong | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
College of Resources and Environment, Linyi University, Linyi 276000, China | | | LIU Guangshan | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | lgshan@xmu.edu.cn | | HUANG Yipu | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | XING Na | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | CHEN Zhigang | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | |
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| Abstract: |
| In the present paper, iodine (I), iron (Fe), manganese (Mn), cobalt (Co), phosphorus (P) and calcium (Ca) contents in three ferromanganese crusts from the Pacific Ocean are measured by spectrophotometric method and inductively coupled plasma atomic emission spectrometers (ICP-AES) to investigate the contents and distribution of iodine in ferromanganese crusts. The results show that iodine contents in three crusts vary between 27.1 and 836 mg/kg, with an average of 172 mg/kg, and the profile of iodine in the three crusts all exhibits a two-stage distribution zone: a young non-phosphatized zone and an old phosphatized zone that is rich in I, P and Ca. The iodine content ratios of old to young zone in MP5D44, CXD62-1 and CXD08-1 are 2.3, 3.4 and 13.7, respectively. The boundary depths of two-stage zone in MP5D44, CXD62-1 and CXD08-1 locate at 4.0 cm, 2.5 cm and 3.75 cm, respectively, and the time of iodine mutation in three crusts ranges from 17-37 Ma derived from 129I dating and Co empirical formula, which is consistent with the times of Cenozoic phosphatization events. The present study shows that the intensity of phosphatization is the main responsible for the distribution pattern of iodine in the crusts on the basis of the correlation analysis. Consequently, iodine is a sensitive indicator for phosphatization. |
| 中文摘要: |
| 为了研究铁锰结壳碘含量和分布特征,本文用分光光度法和电感耦合等离子体原子发射谱仪测量中太平洋三块结壳中I、Fe、Mn、Co、P和Ca含量.MP5D44、CXD62-1和CXD08-1三结壳碘含量变化范围为27.1-836 mg/kg,平均值为172 mg/kg.三结壳碘分布均呈现出两段式分布:年轻未磷酸盐化壳层和老磷酸盐化壳层,且老磷酸盐化层富集I、P和Ca.MP5D44、CXD62-1和CXD08-1老壳层中碘含量分别是年轻壳层碘含量的2.3、3.4和13.7倍.MP5D44、CXD62-1和CXD08-1两段分界线分别位于4.0 cm,2.5 cm和 3.75 cm.利用129I年代学和Co经验公式得到,三结壳碘含量在17-37 Ma期间发生突变.这与新生代磷酸盐化事件发生的时间一致.根据元素相关性分析,磷酸盐化强弱程度是控制铁锰结壳碘含量和分布的主要因素.因此,碘是结壳磷酸盐化的灵敏指示剂. |
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