한국과 중국의 강 퇴적물의 주성분 원소 함량 특성: 황해 니질 퇴적물의 기원지 연구를 위한 잠재적 추적자 = Major elemental compositions of Korean and Chinese river sediments: potential tracers for the discrimination of sediment provenance in the Yellow Sea

다국어 초록 (Multilingual Abstract)

The Yelow and East China seas received a vast amount of sediment (>109ton/yr), which comes mainly fromthe Changjiang and Huanghe rivers of China and the Korean rivers. However, there are still no direct sedimentological-geochemical indicators, which can distinguish these two end-members (Korean and Chinese river sources) in these seas.within the sediment load of the Yellow and East China seas. The compositions of major elements (Al, Fe, Mg, K, Ca,Na, and Ti) of Chinese and Korean river sediments were analyzed. To minimize the grain-size effect, furthermore, bulksediments were separated into two groups, silt (60-20m) and clay (<20m) fractions, and samples of each fraction wereanalyzed for major and strontium isotope (87Sr/86Sr) compositions. In this study, Fe/Al and Mg/Al ratios in bulk sedimentsamples, using a new Al-normalization procedure, are suggested as an excellent tool for distinguishing the source ofsilt and clay fraction samples. In silt fraction samples, Korean river sediments have much higher 87Sr/86Sr ratio(0.7229~0.7253) than Chinese river sediments (0.7169~0.7189), which suggeststhe distribution pattern of 87Sr/86Sr ratios asa new tracer to discriminate the provenance of shelf sediments in the Yelow and East China seas. On the basis of thesegeochemical tracers, clay fractions of southeastern Yellow Sea mud (SEYSM) patch may be a mixture of two sedimentsoriginated fromKorea and China. In contrast, the geochemical compositions of silt fractions are very close to that ofKorea river sediments, which indicatesthat the silty sediments of SEYSM are mainly originated from Korean rivers.......... Geochemical tracers, Korean and Chinese river sediments, Yellow and East China seas. . : ... ....... ... ... ... ... ... ..... .. .. ..... .... ..

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