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자료유형
학술저널
저자정보
저널정보
한국지형학회 한국지형학회지 한국지형학회지 제23권 제2호
발행연도
2016.1
수록면
29 - 45 (17page)

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Chemical composition of fine sediments from Jeongdongjin area are analyzed with XRF method . The results are compared with previously reported results of sandstones of the nearest Simgok port. The weight percentage of SiO2 of the samples are far lower than those of sandstones of Simgok. It is supposed to be happened by the selective elution of SiO2 from the sediment layer of coastal terrace, as there’s no evidence of selective input or precipitation of other elements from outside. As a result of chemical alteration or weathering of sediment at coastal terrace, weight percentage of Al2O3 and Fe2O3 of samples show far higher values than those of Simgok sandstone. In addition, the relative portion of Al2O3 and Fe2O3 are decreased to upward within outcrop of terrace sediment layers. It could be caused by the chemical weathering progress with time. However Chemical Index of alteration(CIA) of sediment samples are no larger than 90 and it could be interpreted that it would take over 100ka for total weathering of sediment in this area. Meanwhile the ratio of SiO2/Al2O3 of terrace sediment showed as 3.48~6.0 and it is far smaller than those of Simgok sandstones(23.9~49.0). The ratio of SiO2/Fe2O3 of terrace sediment(19.19~55.85) showed similar pattern with SiO2/Al2O3 (Simgok sanstone: 119.6~601.8). The ratios have a weak trend of decreasing upwards within the outcrop, there also a huge difference in value among the samples. Chemical composition of reddish brown and gray layers which suspected as the result of psudogleization reveals that reddish brown parts have higher concentration of Fe2O3 than other parts, while there was no significant difference in concentration of Al2O3 and CaO.

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