입도분포에 따른 하상퇴적물의 지구화학적 분산 및 부화

• 발행기관: 대한자원환경지질학회
• 저자명: 이현구 조애란 이찬희
• 간행물 정보: 『자원환경지질』32권 3호, 247~260쪽, 전체 14쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1999.06.30

영문 초록

geochermical characteristics of the fluvial sediments deprnding on particle size distribution size were investigated in the respect of majir, minor and rare eath element chemisitry. Ratios of Al2O3 and K2O/Na2O of the sediments show the homogeneous valus, and partly positive correlation with SiO2/Al2O3, respecively. Characteristics of minor element ratios (V/Ni, Cr/V, Ni/Co and Zr/Hf)are within the lower and narrow range. Thesesuggested that sediment sources may be acidic to intermediate granitic rock, and may be explained by simple weathering and sedimentation. With increasing SiO2 contents, concentrations of Al2O3, Fe2O3, CaO and MgO decreased, but those of K2O and Na2O increased, Concentrations of Ba, Be, Cs, Cu, Li, Ni, Sr, V and Zr show comparatively normal negative and some positive trends. Compared with the mean composition of granite, concentrations of Al2O3, TiO2, Fe2O3, MnO, CaO and MgO in the sediments of the study area were highly enriced. Among some minor and rare earth elements, concentrations of As, Cd, Cu, and V were enriched, but those of Be, Ce, Rb, Sc, Sr and Zn were depleted when compared with average composition of granite. By decreasing of particle size fractions, SiO2, Rb and Sr conterts decreased, but concentrations of Al2O3, Fe2O3, CaO, MgO, TiO2, MgO, P2O5, Be, Cu, Hf, Pb, V and Zr increased. From the correlations between particle size fractions and element concenreations, some elements of Fe2O3, CaO, MgO, P2O5, Cu, Ni, Zn and Zr showed typical trends in the secondary contramination sediments. These trends are typically shown under 100 mesh fractions. It indicates that the fraction of minus 100 mesh is the optimum size fraction for geochemical and environmental survey.

키워드

입도분포 하상퇴적물 지구화학 대전