폐쇄된 청계만에서 조간대 퇴적물의 퇴적환경과 지구화학적 특성
Sedimentary Environments and Geochemistry Characteristics of Tidal Flat Sediments in Semi-enclosed Cheonggye Bay, Korea
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Considering the depositional environment and geochemical behaviors of metals, a total of 12 surface sediments were sampled along two sections in the tidal flats of Cheonggye bay. The mean size of sediments showed between -0.82∅ to 4.97∅ and 1.65∅ to 7.43∅ in Topmeori and Meoguri tidal flats and the sediments were sorted in 1.79∅ to 4.66∅ and 0.77∅ to 2.44∅ in above flats, respectively. The Topmeori flats are composed of msG, gM, gmS, zS and sM, while the Meoguri flats contained (g)S, zS, sZ, Z and M in facies. From the geochemical investigations of the sediments, major and minor elements of the sediments mostly showed the increasing trends toward open sea in contents. The elementary contents might be controlled by clay minerals produced from surrounding rocks, carbonate shell fragments, coarse feldspathic portions of the sediments related with circumferential geology and so forth. In addition, enrichment factors (EF) of the sediments were investigated. K, Mn, Ba, Li, Zn and Pb were enriched in the sediments. Of them, Li, Zn and Pb were generally related to organic contamination. Thus, administrations on above areas are needed in contamination.
Abstract
Considering the depositional environment and geochemical behaviors of metals, a total of 12 surface sediments were sampled along two sections in the tidal flats of Cheonggye bay. The mean size of sediments showed between -0.82∅ to 4.97∅ and 1.65∅ to 7.43∅ in Topmeori and Meoguri tidal flats and the sediments were sorted in 1.79∅ to 4.66∅ and 0.77∅ to 2.44∅ in above flats, respectively. The Topmeori flats are composed of msG, gM, gmS, zS and sM, while the Meoguri flats contained (g)S, zS, sZ, Z and M in facies. From the geochemical investigations of the sediments, major and minor elements of the sediments mostly showed the increasing trends toward open sea in contents. The elementary contents might be controlled by clay minerals produced from surrounding rocks, carbonate shell fragments, coarse feldspathic portions of the sediments related with circumferential geology and so forth. In addition, enrichment factors (EF) of the sediments were investigated. K, Mn, Ba, Li, Zn and Pb were enriched in the sediments. Of them, Li, Zn and Pb were generally related to organic contamination. Thus, administrations on above areas are needed in contamination.
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