Phosphorus behaviors in Sedimentary Pore water: Evidence of Phosphorite Formation in the South Korea Plateau, East Sea

Title
Phosphorus behaviors in Sedimentary Pore water: Evidence of Phosphorite Formation in the South Korea Plateau, East Sea
Author(s)
조진형; 정갑식; 이준호; 이승용; 강정원; 유이선; 우한준; 김성렬; 유해수
KIOST Author(s)
Cho, Jin Hyung(조진형)Jeong, Kap Sik(정갑식)Lee, Jun Ho(이준호)Lee, Seung Yong(이승용)Kang, Jeong Won(강정원)Yoo, Lee Sun(유이선)Woo, Han Jun(우한준)
Alternative Author(s)
조진형; 정갑식; 이준호; 이승용; 강정원; 유이선; 우한준; 김성렬; 유해수
Publication Year
2011-10-11
Abstract
In order to estimate the fluxes of nutrients in sedimentary pore water and the formation mechanism of phosphorite, we analyzed dissolved nutrients (ammonium, nitrite, nitrate, silicate and phosphate), dissolved trace metals (manganese, vanadium and phosphorus), solid phase organic matter and sediment characteristics (porosity, dry bulk density) in 4 box core samples along the slope of the South Korea Plateau, East Sea. Dissolved phosphate concentration in bottom water and pore water at phosphorite collected site was 2-3 times higher than the other sites. The flux of ammonium from sediment to bottom water was estimated to be 15.6-54.2 mmol/m2/yr; nitrite and nitrate, 22.7-73.2 mmol/m2/yr; phosphate, 9.5-25.9 mmol/m2/yr and silicate, 16.8-30.1 mmol/m2/yr. Especially, phosphate ion is enriched in the bottom water and near surface sediments at the site which is located beneath Oxygen Minimum Zone (OMZ). The vertical profiles of redox sensitive ions (nitrate, phosphate, dissolved manganese and vanadium) suggest that redox boundaries are located at 5-15 cm below the surface sediments. Based on the correlation between phosphorite-bound ions, phosphate reduction or re-oxydation at the redox boundary appears to facilitate the diagenetic processes of phosphorite formation in the topmost sedimentary layer.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28187
Bibliographic Citation
7th International Conference on Asian Marine Geology, pp.170, 2011
Publisher
Asian Marine Geology
Type
Conference
Language
English
Publisher
Asian Marine Geology
Related Researcher
Research Interests

Marine Geology,Marine Geochemistry,Marine Security and Safety Research,해양지질,해양지화학,해양방위

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