Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Characteristics of Marine Terrace Sediments Formed during the Marine Isotope Stage 5e in the West South Coast of the Korean Peninsula

한반도 서남해안 MIS 5e 해안단구의 퇴적층 특성 연구

  • Yang, Dong-Yoon (Quaternary Geology Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Min (Quaternary Geology Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Jin Cheul (Quaternary Geology Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Lim, Jaesoo (Quaternary Geology Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Yi, Sangheon (Quaternary Geology Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Ju-Yong (Quaternary Geology Department, Korea Institute of Geoscience and Mineral Resources)
  • 양동윤 (한국지질자원연구원 제4기지질연구실) ;
  • 한민 (한국지질자원연구원 제4기지질연구실) ;
  • 김진철 (한국지질자원연구원 제4기지질연구실) ;
  • 임재수 (한국지질자원연구원 제4기지질연구실) ;
  • 이상헌 (한국지질자원연구원 제4기지질연구실) ;
  • 김주용 (한국지질자원연구원 제4기지질연구실)
  • Received : 2016.10.16
  • Accepted : 2016.12.21
  • Published : 2016.12.28
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Abstract

It was firstly revealed in this research that the marine terrace of the Ijin-ri (Bukpyung-myeon, Haenam-gun) was formed during the last interglacial (Marine Isotope Stage 5e; MIS 5e). The marine terrace totally ranging from 4.8 m (asl) to 8.8 m (asl) is subdivided into 4 units; Unit I ranges 4.8-5.3 m, unit II ranges 5.3-6.9 m, unit III ranges 6.9-8.3 m, and unit IV ranges 8.3-8.8 m. Strong evidences that units II and III were formed during MIS5e were obtained based on OSL dating, the physical characterizations such as particle size distribution, magnetic susceptibility and water content, principal element and trace element analyses, and quantitative clay mineral analysis for samples at the 30 cm intervals. The rounded gravels on the marine terrace are regarded to be originated from the clastic materials transported directly from the surrounding mountains toward the marine and abraded in the coastal area, without any fluvial processes. During the warmest period (125k, unit II), the increase in rainfall, along with the rapid rise in sea level, was likely caused the high amount of clastic materials transported to the upper part of the beach. As a result of comparing clay mineral ratios of study site with those derived from sediments of either tidal flats, or the Yellow Sea, it is interpreted that the sediments of study site were influenced from the marine. The results will be used to investigate the hydrological activity and sedimentary environment during the high sea level in the past.

이번 연구에서는 해남군 이진리 해안단구가 마지막 간빙기 최온난기(Marine Isotope Stage 5e; MIS 5e)에 형성되었음을 최초로 밝힌다. 이는 해발고도 4.8 m에서 8.8 m까지의 단구이며, 4개의 unit로 나누어진다(unit I: 4.8-5.3 m, unit II: 5.3-6.8 m, unit III: 6.8-8.3 m, unit IV: 8.3-8.8 m). 연구대상 퇴적층은 10-30 cm 간격으로 입도분포, 대자율, 함수율 등의 물리특성 분석, 주원소와 미량원소 분석, 점토광물 정량분석 등을 실시하였으며, OSL 연대분석을 통하여 unit II와 III이 MIS 5e에 형성된 것으로 추정하였다. 퇴적층에 포함된 원력들은 주변에 하천이 없는 점으로 미루어 주변 배후 산지에서 바다로 유입된 쇄설물들이 바다에서 마모 작용을 받은 후 재퇴적된 것으로 추정된다. 연대측정 결과, 전반적으로 매우 빠른 퇴적률을 보이는 점은 최온난기(125k; unit II 하위)를 전후한 급격한 해수면 상승과 더불어 강우량 등의 증가로 인해 쇄설물 유입이 증가한 것으로 추정된다. 연구 지역의 점토 광물 비를 현재의 조간대, 황해와 비교한 결과, 연구 지역의 퇴적물은 바다의 영향을 많이 받은 것으로 추정된다. 이 결과는 과거 해수면이 높았던 시기의 수문 활동 및 퇴적 환경을 규명하는데 활용될 수 있을 것으로 보인다.

Keywords

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