Characterization of Clay Minerals and Elemental Compositions between Fe/Mn Nodules and Their Surrounding Soils Distributed in Okinawa, Japan
スポンサーリンク
概要
- 論文の詳細を見る
This study was carried out to characterize clay minerals and elemental compositions between Fe/Mn nodules and their surrounding soils in Okinawa and Kume Islands, Japan, and find out reliable sources of their origin. Mineralogical composition of Fe/Mn nodules and surrounding soils was analyzed by the successive selective dissolution procedure (SSDP) combined with XRD technique. Their total elemental composition was carried out using the acid digestion system. Total elemental analysis of extracts were performed by inductively coupled plasma atomic emission spectrometry (ICP-AES). Results explained that Mn minerals of lithiophorite (Lp) and birnessite (Bs) were concentrated only in nodules, while Fe and Al oxides and layer silicate minerals were contained in nodules as well as soils. Secondary mineral of smectite was observed in only one nodule sample and its corresponding soil sample. Concentrations of Ca, P, Mn, Ba, V, Co, Ni, Zn, Cu and Fe in many samples were higher in the nodules than in the surrounding soils, while Ba concentration was unexpectedly higher in nodule samples. Concentrations of Mg, Al, Cr and K were higher in the surrounding soils. Although some nodules had higher concentration of Sr and Na than the surrounding soils, there was no discernible trend towards higher concentration in the nodules. The results suggested that there was a tendency for Mn nodules to concentrate most of Mn minerals and trace elements together with Mn and Ba. Moreover, Fe/Mn nodules in Okinawa and Kume Islands have a close relationship with sea floor activities and "Shimajiri mahji" in the surrounding environment of nodules which could be formulated after upheaval of marine sediments.
- 日本ペドロジー学会の論文
- 2005-06-30
著者
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TOKASHIKI Yoshihiro
Dept. Environmental Sciences & Technology, College of Agriculture, University of the Ryukyus
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Arachchi Lal
Dept. Of Environmental Science & Technology Faculty Of Agriculture University Of The Ryukyus
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Kitou Makoto
Dept. Of Environmental Sciences & Technology Faculty Of Agriculture University Of The Ryukyus
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Bakker Alexandre
Dept. Of Environmental Science & Technology Faculty Of Agriculture University Of The Ryukyus
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Tokashiki Y
Dept. Of Environmental Science & Technology Faculty Of Agriculture University Of The Ryukyus
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De Bakker
National Institute For Research In Amazonia (inpa) Agronomy Coordination (cpca)
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Bakker Alexandre
National Institute For Research In Amazonia (inpa) Agronomy Coordination (cpca)
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Vidhana Arachchi
Dept. of Environmental Sciences & Technology, Faculty of Agriculture, University of the Ryukyus
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