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Mineralogy and Biogeochemistry of Intertidal Flat Sediment, Muan, Chonnam, Korea  

Park, Byung-No (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Lee, Je-Hyun (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Oh, Jong-Min (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Lee, Seuug-Hee (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Han, Ji-Hee (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Kim, Yu-Mi (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Seo, Hyun-Hee (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Roh, Yul (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.20, no.1, 2007 , pp. 47-60 More about this Journal
Abstract
While sedimentological researches on Western coastal tidal flats of Korea have been much pelformed previously, mineralogical and biogeochemical studies are beginning to be studied. The objectives of this study were to investigate mineralogical characteritics of the inter-tidal flat sediments and to explore phase transformation of iron(oxyhydr)oxides and biomineralization by metal-reducing bacteria enriched from the inter-tidal flat sediments from Muan, Jeollanam-do, Korea. Inter-tidal flat sediment samples were collected in Chungkye-myun and Haeje-myun, Muan-gun, Jeollanam-do. Particle size analyses were performed using the pipette method and sedimentation method. The separates including sand, silt and clay fractions were examined by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), and X-ray diffiaction (XRD). After enriching the metal-.educing bacteria from the into,-tidal flat sediments, the bacteria were used to study phase transformation of the synthesized iron (oxyhydr)oxides and iron biomineralization using lactate or glucose as the electron donors and Fe(III)-containing iron oxides as the electron accepters. Mineralogical studies showed that the sediments of tidal flats in Chung]rye-myun and Haeje-myun consist of quartz, plagioclase, microcline, biotite, kaolinite and illite. Biogeochemical researches showed that the metal-reducing bacteria enriched from the inter-tidal flat sediments reduced reddish brown akaganeite and mineralized nanometer-sized black magnetite. The bacteria also reduced the reddish brown ferrihydrite into black amorphous phases and reduced the yellowish goethite into greenish with formation of nm-sized phases. These results indicate that microbial Fe(III) reduction may play one of important roles in iron and carbon biogeochemistry as well as iron biomineralization in subsurface environments.
Keywords
Inter tidal flat; Sediment; Biogeochemistry; Iron reduction; Biomineralization;
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Times Cited By KSCI : 1  (Citation Analysis)
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