Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Geochemical Properties of Deep Sea Sediment in the Benthic Environmental Impact Experiment Site (BIS) of Korea

심해 저층환경충격 시험지역의 퇴적물 지화학적 특성

  • 공기수 (한국지질자원연구원 석유해저연구본부) ;
  • 형기성 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 최헌수 (한국지질자원연구원 석유해저연구본부) ;
  • 지상범 (한국해양과학기술원 심해저광물자원연구센터)
  • Received : 2014.10.06
  • Accepted : 2014.11.27
  • Published : 2014.12.30
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Abstract

The benthic environmental impact experiment addresses environmental impacts at a specific site related to deep-sea mineral resource development. We have acquired several tens of multi- or box core samples at 31 sites within the Benthic environmental Impact Site (BIS) since 2010, aiming to examine the basic properties of surficial deep-sea sediment as a potential source for deep-water plumes. In this study, we present the geochemical properties such as major elements, rare earth elements (REEs), and heavy metal contents at the BIS. Such proxies vary distinctly according to the Facies association. The lithology of all core sediments in the BIS corresponds to both Association Ib and Association IIIb. The vertical profiles of some major elements ($SiO_2$, $Fe_2O_3$, CaO, $P_2O_5$, MgO, MnO) show noticeable differences between Association Ib and IIIb, while others ($Al_2O_3$, $TiO_2$, $Na_2O$, and $K_2O$) do not vary between Association Ib and IIIb. REEs are also distinctly different for Associations Ib and IIIb; in Association Ib, REY and HREE/LREE are uniform through the sediment section, while they increase downward in Association IIIb like the major elements; below a depth of 8 cm, REY is over 500 ppm. The metal enrichment factor (EF) evaluates the anthropogenic influences of some metals (Cu, Ni, Pb, Zn, and Cd) in marine sediments. In both Associations, the EF for Cu is over 1.5, the EF for Ni and Pb ranges from 0.5 to 1.5, and the EF for Zn and Cd are less than 0.5, indicating Cu is enriched but Zn and Cd are relatively depleted in the BIS. The vertical variations of geochemical properties between Association Ib and IIIb are shown to be clearly different, which seems to be related to the global climate changes such as the shift of Intertropical convergence zone (ITCZ).

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References

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