Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Characteristics of Organic Matter in the Quaternary Sediments from ODP Leg 127 Site 794A, East Sea

동해 ODP Leg 127 Site 794A에서 채취한 제4기 퇴적물의 유기지화학적 특성 연구

  • Lee Sang Il (Department of Geology, Chungnam National University) ;
  • Lee Young-Joo (Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim Ji Hoon (Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Oh Jae Ho (Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Yun HyeSu (Department of Geology, Chungnam National University)
  • 이상일 (충남대학교 지질학과) ;
  • 이영주 (한국지질자원연구원 석유해저자원연구부) ;
  • 김지훈 (한국지질자원연구원 석유해저자원연구부) ;
  • 오재호 (한국지질자원연구원 석유해저자원연구부) ;
  • 윤혜수 (충남대학교 지질학과)
  • Published : 2005.12.01
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Abstract

Organic geochemical analyses including Rock-Eval pyrolysis, elemental analysis and stable carbon isotope analysis were performed to evaluate the characteristics of organic matter in the ODP Leg 127 Site 794A sediments and to understand paleoceanographic changes. Based on the TOC contents, C/N ratio, HI vs. OI, $\delta^{13}C_{org}$ and C/S ratio, results imply that dark layers containing a large amount of terrigenous organic matter were deposited under the suboxic/anoxic conditions, whereas the light layers containing largely marine organic matter were deposited under the oxic conditions. These results indicate that increasing surface-productivity by the input of a large amount of terrigenous organic matter from adjacent continent led to the deposition of dark layers during the interglacial highstands, whereas marine primary production and dilution caused by Kosa from the China desert area led to the deposition of light layers with the decreased to terrigenous organic matter during the glacial lowstands.

ODP Leg 127 Site 794A에서 채취한 제4기 퇴적물의 유기지화학적 특성을 규명하고 고해양학적 의의를 이해하기 위하여 Rock-Eval 열분석, 원소 분석 및 유기물의 탄소동위원소 분석 등의 유기지화학적 분석을 실시하였다. 총유기탄소 함량, 총유기탄소에 대한 총질소 함량비, 총유기탄소에 대한 총황 함량비, 수소지수와 산소지수의 관계 및 유기물의 탄소동위원소 비를 기초로 유기물 특성 및 퇴적 당시의 고해양환경 해석을 시도하였다. 유기지화학적 분석결과 암색층은 상당량의 육상기원 유기물을 함유하고 빈산소/무산소환경에서 퇴적된 것으로 나타났다. 반면 담식층은 해양기원 유기물이 우세하게 포함되어 있으며 산소환경에서 퇴적된 것으로 나타났다. 이와 같은 결과는 해수면이 상승했던 간빙기동안 주변 대륙으로부터 다량의 육상기원 유기물의 유입으로 동해 표층생산성이 높아짐으로써 암색층이 퇴적된 것으로 해석된다. 반면에 해수면이 하강했던 빙기동안에는 육상기원 유기물 유입이 급감하였으며, 주로 해양의 일차생산과 중국사막지역으로부터 유입된 Kosa에 의한 퇴적물 희석작용에 의해 담색층이 퇴적된 것으로 해석된다.

Keywords

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