⑦국문지리학회지-이광률-OK

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철민 노
6 years ago
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1 Properties of Deposits and Geomorphic Formative Ages on Marine Terraces in Gwangyang Bay, South Sea of Korea Gwang-Ryul Lee* and Chung-Sun Park** OSL m OSL MIS 5a 0.141m/ka 2 18~22m MIS 5e 3 27~32m MIS 7 : Abstract In order to analyze synthetically geomorphological processes of marine terrace in Korea, this study deals with the distribution of marine terraces, stratification of sedimentary layers, physicochemical properties of deposits, and formative ages of marine terraces based on OSL(Optically Stimulated Luminescence) absolute age at coastal area of Gwangyang Bay in central part of the South Coast. As a result of comparison with physicochemical properties on diverse geomorphic materials, there is not enough distinction in them, because of recycling and mixing of materials at Gwangyang Bay having a geomorphic closure. In Gwangyang bay coast, marine terraces are discovered at least 3 levels and have a small area. Formative age of 1st Terrace, as the lowest level ranging in 10~13m above the sea level, is estimated at MIS(Marine Isotope Oxygen Stage) 5a, based on OSL age dating and properties of deposits. Uplifting rate is calculated at 0.141m/ka in Gwangyang bay coast. For application to this rate, 2nd terrace(18~22m) is estimated at MIS 5e, 3rd terrace(27~32m) is latter part of MIS 7. Consequently, we might conclude that uplifting and geomorphic process of marine terrace in South Coast is similar to East Coast during the Late Pleistocene in Korea. : Gwangyang bay, marine terrace in South Coast, formative age of marine terrace, uplifting rate, major element and rare earth element analyses Researcher, Institute of Education for National Unification, Korea National University of Education georiver@khu.ac.kr Master, Department of Geography, Kyung-Hee University 346

2 a 1980b 1983 Lee 1987 Chang a 1995b 1996a 1996b km -1m tidal flat m 30 40m kaolinite chlorite illite smectite m km km km

3 348

4 km km km magnetic susceptibility ZH SM ph X XRF ICP-MS sand granule sieve mud Stokes U Folk and Ward ph 1 5 PHC-200 ph Munsell dry moisture Taylor Taylor 2001 rubification melanization Rubification=10[(hue X+value X+chroma X)dry+(hue X+value X+chroma X)wet]/190 Melanization=10[(hue Y+value Y+chroma Y)dry+(hue Y+value Y+chroma Y)wet]/85 X Y X Shimadzu XRF Sequential Rh target 40KV 30mA wt SiO 2 Al 2 O 3 Fe 2 O 3 TiO La Lu 14 Pm ppm Leedey Masuda et al., 1973; Masuda, 1975 Ce Eu La/Yb N 349

5 350

6 OSL Optically Stimulated Luminescence OSL km 2 30m cm m 472m F2 3 F m 61 66m 72 76m 80 85m cm 1 2m m 19 22m 27 32m 38 43m 45 49m 53 58m 63 69m 74 80m 86 91m 94 99m m m m m 14 35m 6 cm 35m 35m

7 3 1 T m 1 2m 1 2m 2 T m 3 T m GY1 GY GY m GY4-0.5m GY5-2.0m GY11-0.2m GY2-2.0 GY4-1.0m GY11-1.8m GY U fine sand GY m 0.7m 1m 21m 5 0 7m GY m m OSL 30cm 3 10cm GY2 OSL 8 9m 1 8m 2 4m 9 5m GY

8 광양만 일대 해안단구의 퇴적물 특성과 지형 형성시기 그림 4. 여수시 조화리 일대의 지형경관 그림 5. 하동군 갈사리 일대의 지형경관 그림 6. 남해군 갈화리 일대의 해안단구 지형 경관 그림 7. 여수시 신풍리 GY2 노두 그림 8. 여수시 조화리 GY4 인접 노두 그림 9. 광양시 황금동 GY5 노두 그림 10. 광양시 황금동 GY15 노두 -`353`-

9 U (m) granule sand mud ph (10-6 SI) 1m GY GY GY GY GY GY GY GY , GY GY , GY GY GY GY GY GY GY GY GY ,120 GY4 2 19m 0 8m GY m 1, SI GY4 30m 8 354

10 m GY5 3 F3 7 8m pebble cobble 9 472m 2m 50 sand 1 60U GY m 1 5m 5 10cm 0 4m 6 64U 1m 4 64U 1 2mm burrow SI SI m 2 3m 0 8m 0 8m m 3m GY8 2 1m 5cm GY9 1 10m 1m cm GY10 14m cm GY11 1 6m 0 6m 1 2cm 1m 0 8cm 355

11 SiO 2 Al 2 O 3 TiO 2 Fe 2 O 3 Ce/Ce* Eu/Eu* (La/Yb) N GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY GY

12 GY12 4 cm GY13 GY12 100m 3 26m 0 3m 0 4m GY14 m GY4-1.0 GY GY GY GY2 1 5m 9 5m OSL ka OSL 2004 OSL GY m 1 7 MIS 5a 1995b MIS 5a 20 25m 13 18m 357

2002 1 MIS 5a 0 119m/ka 0 163m/ka 0 141m/ ka 2 3 13

13 MIS 5a 0 119m/ka 0 163m/ka 0 141m/ ka m 2 MIS 5e 27 32m 3 MIS m

14 1 GY2-1.5m 9 5m OSL 70.1ka GY2 9.5~13m 1 7 MIS 5a m/ka 18~22m 2 MIS 5e 27~32m 3 MIS 7 OSL Toshiro Naruse Akira Hayashida 2004 E55S a b mechanism

15 1992 Shore Platform (1), a b a b OSL Chang, H., 1987, Geomorphic Development of Intermontane Basins in Korea, Dissertation to the Univ. of Tsukuba. Chappell, J., Omura, A., Esat, T., McCulloch, M., Pandolfi, J., Ota, Y. and Pillans, B., 1996, Reconciliation of late Quaternary sea levels derived from coral terraces at Huon Peninsula with deep sea oxygen isotope records, Earth and Planetary Science Letters, 141, Lee, D. Y., 1987, Stratigraphical Research of the Quaternary Deposits in the Korean Peninsula, The Korean Journal of Quaternary Research, 1(1), Masuda, A., 1975, Abundances of mono isotopic REE, consistent with the Leedey chondritic values, Geochemical Journal, 9, Masuda, A., Nakamura, N. and Tanaka, T., 1973, Fine Structure of mutually normalized rare-earth patterns of chondrites, Geochimica et Cosmochimica Acta, 37, Saito, Y., Katayama, H., Ikehara, K., Kato, Y., Matsumoto, E., Oguri, K., Oda M. and Yumoto, M., 1998, Transgressive and highstand systems tracts and post-glacial transgression, the East China Sea, Sedimentary Geology, 122, Taylor, G. and Eggleton, R. A., 2001, Regolith Geology and Geomorphology, John Wiley & Sons georiver@khu.ac.kr Correspondence Lee, Gwang-Ryul, Ssangyong Apt , Imoon 3-Dong, Dongdaemoon-Gu, Seoul, Korea( georiver@khu.ac.kr, Tel ) 360

44-3대지.02이광률c

44-3대지.02이광률c Properties of Channel and Evolutions of Fluvial Terraces in Odae River Gwang-Ryul Lee* 1 3 OSL 1 MIS 2 2 MIS 3 2 0 205m/ka 0 269m/ka Abstract This study analyzes the properties of fluvial landforms in