Estimate of Manganese and Iron Oxide Reduction Rates in Slope and Basin Sediments of Ulleung Basin, East Sea

동해 울릉분지 퇴적물에서 망간산화물과 철산화물 환원율 추정

  • Choi, Yu-Jeong (School of Earth and Environmental Science/Research Institute of Oceanography, Seoul National University) ;
  • Kim, Dong-Seon (Climate Change & Coastal Disaster Research Department, KORDI) ;
  • Lee, Tae-Hee (Southern Coastal Environment Research Department, KORDI) ;
  • Lee, Chang-Bok (School of Earth and Environmental Science/Research Institute of Oceanography, Seoul National University)
  • 최유정 (서울대학교 지구환경과학부/해양연구소) ;
  • 김동선 (한국해양연구원 기후연안재해연구부) ;
  • 이태희 (한국해양연구원 남해연구소) ;
  • 이창복 (서울대학교 지구환경과학부/해양연구소)
  • Published : 2009.08.31

Abstract

In order to determine organic carbon oxidation by manganese and iron oxides, six core sediments were obtained in slope and basin sediments of Ulleung Basin in East Sea. The basin sediments show high organic carbon contents (>2%) at the water depths deeper than 2,000 m; this is rare for deep-sea sediments, except for those of the Black Sea and Chilean upwelling regions. In the Ullleung Basin, the surface sediments were extremely enriched by Manganese oxides with more than 2%. Maximum contents of Fe oxides were found at the depth of $1{\sim}4cm$ in basin sediments. However, the high level of Mn and Fe oxides was not observed in slope sediment. Surface manganese enrichments (>2%) in Ulleung Basin may be explained by two possible mechanisms: high organic carbon contents and optimum sedimentation rates and sufficient supply of dissolved Manganese from slope to the deep basin. Reduction rates of iron and manganese oxides ranged from 0.10 to $0.24\;mmol\;m^{-2}day^{-1}$ and from 0.30 to $0.57\;mmol\;m^{-2}day^{-1}$, respectively. In Ulleung Basin sediments, $13{\sim}26%$ of organic carbon oxidation may be linked to the reduction of iron and manganese oxides. Reduction rates of metal oxides were comparable to those of Chilean upwelling regions, and lower than those of Danish coastal sediments.

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