| Manganese Abnormity in Holocene Sediments of the Bohai Sea |
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| 作者姓名： | 刘建国 李安春 徐兆凯 徐方建 |
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| 作者单位： | Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Graduate University Chinese Academy of Sciences Beijing 100049 China，Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences，Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Graduate University Chinese Academy of Sciences Beijing 100049 China，Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Graduate University Chinese Academy of Sciences Beijing 100049 China，Qingdao 266071 China Qingdao 266071 China Qingdao 266071 China Qingdao 266071 China |
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| 基金项目： | This paper is supported by the National Natural Science Foundation of China （No. 40576032）. |
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| 摘 要： | Manganese abnormity has been observed in the Holocene sediments of the mud area of Bohai Sea. On the basis of grain size, chemical composition, heavy mineral content and accelerator mass spectrometry (AMS) 14C dating of foraminifer, relationships between manganese abnormity and sedimentation rates, material source, hydrodynamic conditions are probed. Manganese abnormity occurred during the Middle Holocene when sea level and sedimentation rates were higher than those at present. Sedimentary hiatus was not observed when material sources and hydrodynamic conditions were quite similar. Compared with the former period, the latter period showed a decrease in reduction environment and an inclination toward oxidation environment with high manganese content, whereas provenance and hydrodynamic conditions showed only a slight change. From the above observations, it can be concluded that correlation among manganese abnormity, material source, and hydrodynamic conditions is not obvious. Redox environment seems to be the key factor for manganese enrichment, which is mainly related to marine authigenic process.
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| 关 键 词： | 中国 渤海 全新世 沉淀物 锰 沉积速率 |
| 收稿时间： | 12 January 2007 |
| 修稿时间： | 2007-01-122007-03-20 |
Manganese Abnormity in Holocene Sediments of the Bohai Sea |
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| Liu Jianguo,Li Anchun,Xu Zhaokai,Xu Fangjian.Manganese Abnormity in Holocene Sediments of the Bohai Sea[J].Journal of China University of Geosciences,2007,18(2):135-141. |
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| Authors: | Liu Jianguo Li Anchun Xu Zhaokai Xu Fangjian |
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| Institution: | 1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate University, Chinese Academy of Sciences, Beijing 100049, China
2. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China |
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| Abstract: | Manganese abnormity has been observed in the Holocene sediments of the mud area of Bohai Sea. On the basis of grain size, chemical composition, heavy mineral content and accelerator mass spectrometry (AMS) 14C dating of foraminifer, relationships between manganese abnormity and sedimentation rates, material source, hydrodynamic conditions are probed. Manganese abnormity occurred during the Middle Holocene when sea level and sedimentation rates were higher than those at present. Sedimentary hiatus was not observed when material sources and hydrodynamic conditions were quite similar. Compared with the former period, the latter period showed a decrease in reduction environment and an inclination toward oxidation environment with high manganese content, whereas provenance and hydrodynamic conditions showed only a slight change. From the above observations, it can be concluded that correlation among manganese abnormity, material source, and hydrodynamic conditions is not obvious. Redox environment seems to be the key factor for manganese enrichment, which is mainly related to marine authigenic process. |
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| Keywords: | manganese abnormity Holocene sediment sedimentation rate Bohai Sea |
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