Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Geochemical Characteristics of Core Sediments from the northwestern Ulleung Basin, East Sea: Implications for Paleoenvironmental Changes

울릉분지 북서부해역 코어퇴적물의 지화학적 특성: 고환경 변화

Kim, Il-Soo;Park, Myong-Ho;Yu, Kang-Min;Ryu, Byong-Jae
김일수;박명호;유강민;류병재

  • Published : 20040300

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Abstract

Two piston cores (01GHP-01, 01GHP-04), obtained from the northwestern Ulleung Basin in the East Sea, were analyzed to study the geochemical characteristics of core sediments. During the Termination I, total organic carbon increased, resulting from an influx of marine organic matter owing to inflow of Tsushima Current through the Korea Strait. The change of characteristics of organic matter and sedimentary facies mainly occurred from the last glacial maximum (LGM) to Holocene. It results from changing sedimentary environments, such as fluctuation of sea-level and paleoclimate. The C/N ratios indicate that organic matters in the core sediments originated from marine environment. Correlations of results from hydrogen index, oxygen index, total organic carbon and $S_2\;peak$ suggest that most of organic matters in the core sediments are Type II. These results also imply to be of marine origin.

울릉분지 북서부 해역에서 두 개의 코어(01GHP-01, 01GHP-04)를 대상으로 하여 코어퇴적물 내에 분포하는 유기물들의 특성을 연구하였다. 유기탄소 함량이 마지막빙기에서 홀로세로 변화하는 시기(Termination I)에 증가하는 양상을 보이는 것은 대한해협을 통한 쓰시마해류의 유입으로 인한 해수면 상승과 함께 해양성 유기물 유입의 증가 때문으로 판단된다. 유기물의 특성과 퇴적상의 변화가 주로 마지막 빙기에서 홀로세로 변화하는 시기에 뚜렷한 변화를 보인다. 이는 해수면 및 기후 변동을 통한 퇴적환경 변화로 인한 것으로 생각된다. 총유기탄소와 질소의 비율은 전반적으로 해양성 기원의 유기물을 포함하고 있음을 나타낸다. 수소지수와 산소지수, 총유기탄소와 $S_2\;peak$를 상대적으로 비교해 본 결과 대부분 Type II의 유기물에 해당하는 것으로 보아 전체적으로 해양성 기원의 유기물로 이루어진 것으로 생각된다.

Keywords

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