단구 퇴적층의 화학 조성 변화에 대한 연구 - 정동진 단구의 세립 물질을 사례로 -
A study on the change of chemical composition of sediment particles of terrace deposits - A case of fine sediments at Jeongdongjin area -
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
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.
Abstract
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.
참고문헌 (24)
- Buggle, B., "An evaluation of geochemical weathering indices in loesspaleosol studies", Quaternary International, 240, pp.12~21 (2011)
- Burke, B. J., "Weathering the escarpment:chemical and physical rates and processes, south-eastern Australia", Earth Surface Processes and Landforms, 34, pp.768~785 (2009)
- Choi, J. H., "Luminescence dating of well-sorted marine terrace sediments on the southeastern coast of Korea", Quaternary Science Reviews, 22, pp.407~421 (2003)
- Choi, S. J., "Estimation of possible maximum earthquake magnitudes of Quaternary faults in the southern Korean Peninsula", Quaternary International, 344, pp.53~63 (2014)
- Fedo, C. M., "Unvailing the effects of potassium metasomatism in sedimentary rocks and paleosols, with implications for paleoweathering conditions and provenance", Geology, 23(10), pp.921~924 (1995)
- Hong, H., "Clay mineralogy and geochemistry and their palaeoclimatic interpretation of the Pleistocene deposits in the Xuancheng section, southern China", Journal of Quaternary Science, 25(5), pp.662~672 (2010)
- Hong, S.C., "Constraining the depositional age of marine terrace sediments along the Eastern coast of Korea using optical dating", Ph.D, pp.2014
- 김종연, "암석의 특성과 풍화 미지형과의 관계에 대한 연구 -심곡 지역의 셰일과 사암을 사례로-", 한국사진지리학회지, 25(2), pp.77~95 (2015), 한국사진지리학회
- 김종연, "아야진 구릉에 분포하는 풍화대와 토양의 특성에 대한 연구", 한국사진지리학회지, 25(4), pp.67~86 (2015), 한국사진지리학회
- 김종연, "고창군 광승리 연안 퇴적층의 퇴적 시기와 범람 기원 특성", 한국지구과학회지, 36(3), pp.222~235 (2015), 한국지구과학회
- 김종연, "정동진 단구 자갈층과 충진 물질의 입도 및 형상 특성에 대한 연구", 한국지형학회지, 23(1), pp.17~33 (2016), 한국지형학회[DOI]
- Kim, Y.J, "A weathering progressing aspect based on physical and chemical properties of tafoni in the Simgok area of Gangneung, Korea", Master, pp.2014
- Korean Geological Society, "Geology of Korea" (1999), Sigma press
- 이광률, "북한강 하안단구 퇴적층의 풍화 특성", 대한지리학회지, 39(3), pp.425~443 (2004), 대한지리학회
- Lim, Y.S., "Evaluation of suspended sediment sources in the Yeongsan River", Ph.D, pp.2016
- Nesbitt, H.W., "Prediction of some weathering trends of plutonic and volcanic rocks based on thermodynamic and kinetic considerations", Geochemica Cosmochemica Acta, 48, pp.1523~1534 (1984)
- Parker, A., "An index of weathering for silicate rocks", Geological Magazine, 107(6), pp.501~504 (1970)
- Ruxton, B.P., "Measures of degree of chemical weathering of rocks", The Journal of Geology, 76, pp.518~527 (1968)
- Shin, W.J., "The Quaternary sedimentary environment using physical-geochemical characteristics and depositional ages of aeolian deposits Gwangseung-ri", Master, pp.2016
- Tanaka, K., "Dating of marine terrace sediments by ESR, TL and OSL methods and their applicabilities", Quaternary Science Reviews, 16, pp.257~264 (1997)
- van der Weijden, C.H., "Mobility of major, minor and some redox-sensitive trace elements and rare-earth elements during weathering of four granitoids in central Portugal", Chemical Geology, 125, pp.149~167 (1995)
- Wintle, A.G., "A review of quartz optically stimulated luminescence characteristics and their relevance in single aliquot regeneration dating protocols", Radiation Measurements, 41, pp.369~391 (2006)
- 이선복, "江陵市 正東津 地域 段丘地形 再考", 한국지형학회지, 16(2), pp.29~42 (2009), 한국지형학회
- Yi, S.B., "Characteristics and depositional environment of paleosol layers developed on top of the terrace in the Jeongdongjin area, East Coast, Korea", The Korean Journal of Quaternary Research, 23(1), pp.1~24 (2009)