Geochemical properties of deep sea sediment in the benthic environmental impact experiment site (BIS) of korea SCOPUS KCI

Title
Geochemical properties of deep sea sediment in the benthic environmental impact experiment site (BIS) of korea
Author(s)
Kong, G.S.; Hyeong, K.; Choi, H.-S.; Chi, S.-B.
KIOST Author(s)
Hyeong, Kiseong(형기성)Chi, Sang Bum(지상범)
Publication Year
2014
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 (SiO2, Fe2O3, CaO, P2O5, MgO, MnO) show noticeable differences between Association Ib and IIIb, while others (Al2O3, TiO2, Na2O, and K2O) 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). © 2014, Korea Ocean Research and Development Institute. All rights reserved.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2944
DOI
10.4217/OPR.2014.36.4.407
Bibliographic Citation
Ocean and Polar Research, v.36, no.4, pp.407 - 421, 2014
Publisher
Korea Ocean Research and Development Institute
Subject
benthos; climate change; deep-sea sediment; environmental impact; facies analysis; geochemistry; heavy metal; intertropical convergence zone; marine sediment; rare earth element; Korea
Keywords
BIS; Climate change; Facies association; Geochemical properties
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

deep sea mineral resources,deep sea sediments,심해저 광물자원,심해저 퇴적물,심해 환경

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