Characteristics in Elemental Composition of Ferromanganese Concretions from Lake Biwa.
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- TAKAMATSU Takejiro
- Water and Soil Enviroment Division, National Institute for Environmental Studies
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- KAWASHIMA Munetsugu
- Faculty of Liberal Arts and Education, Shiga Universisty
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- TAKADA Jitsuya
- Research Reactor Institute, Kyoto University
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- MATSUSHITA Rokuji
- Research Reactor Institute, Kyoto University
Bibliographic Information
- Other Title
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- 琵琶湖産フェロマンガン酸化物の元素組成とその特性
Abstract
Ferromanganese crusts were sampled from the surface of a stone collected at a depth of 20 m in the northern part of Lake Biwa, Japan. These samples were analysed for 37 elements by neutron activation, X-ray fluorescence, and ICP-AE. The crusts were found to be enriched with Ba, P, B, As, and sometimes with Co, Ni, Cu and Sb. The elements were classified into 4 groups based on the varieties of host minerals (Fe-oxides, Mn-oxides or allochthonous materials) in which they were incorporated : elements mainly associated with 1) Mn-oxides : Ba, Ni, Cs, Sr and Co ; 2) Fe-oxides : P, B and As; 3) allochthonous materials : Na, K, Rb, Al, Ti, Sc, Hf and Th ; and 4) Mn-oxides plus allochthonous materials : rare earth elements and major heavy metals. The elemental compositions in the Lake Biwa concretions, including the crusts and Mn-deposits studied previously by these authors, were compared with those in other freshwater and oceanic concretions. As a result, the concentrations of rare earth elements and major heavy metals were found to be much lower, whereas those of B, P and As were higher in the Lake Biwa than in the oceanic concretions. These differences could be well explained in terms of the effects of sea salt, growth rates of the concretions, and pH of the formation environment.
Journal
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- Japanese Journal of Limnology (Rikusuigaku Zasshi)
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Japanese Journal of Limnology (Rikusuigaku Zasshi) 54 (4), 281-291, 1993
The Japanese Society of Limnology
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Keywords
Details 詳細情報について
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- CRID
- 1390282679035862784
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- NII Article ID
- 130003442191
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- ISSN
- 18824897
- 00215104
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed