Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
권호 표지

Sulfate Reduction and Origin of Organic Matter in the Ulleung Basin, East Sea

동해 울릉분지에서의 황산염 환원작용과 유기물의 기원

  • Park Myong-Ho (Technical Department, Korea National Oil Corporation) ;
  • Kim Ji-Hoon (Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Ryu Byong-Jae (Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim Il-Soo (Domestic Exploration Team I, Korea National Oil Corporation) ;
  • Lee Youngju (Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Chang Ho-Wan (School of Earth and Environmental Science, Seoul National University)
  • 박명호 (한국석유공사 기술실) ;
  • 김지훈 (한국지질자원연구원 석유해저자원연구부) ;
  • 류병재 (한국지질자원연구원 석유해저자원연구부) ;
  • 김일수 (한국석유공사 대륙봉탐사처) ;
  • 이영주 (한국지질자원연구원 석유해저자원연구부) ;
  • 장호완 (서울대학교 지구환경과학부)
  • Published : 2005.06.01
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Abstract

In this study, core sediments and pore water were analysed to identify the origin of organic matter and Bas in late Quaternary sediments from the northwestern Ulleung Basin of the East Sea. C/N and C/S ratios in the sediments show that the organic matter in the study area originated predominantly from marine algae. However, the results of Rock-Eval pyrolysis indicate that the organic matter has an origin of the land-plant (Type III), locating in the immature stage. These different results might be due to the heavy oxidizing of the organic matter during sinking down to the seafloor or after deposition in the sediments. Concentration of sulfate in the pore water decreases gradually with core depth, while concentration of $CH_4$ increases gradually with core depth. This indicates that sulfate reduction and methanogenesis occurred actively in the sediments. Also, it is likely that the compositions of $CH_4$ are characterized as a more biogenic origin, mostly caused by microbial activity, rather than a thermogenic one.

이 연구에서는 동해 울릉분지 북서부해역의 제4기 후기 퇴적물 내의 유기물과 가스의 기원을 규명하기 위해서 천부 퇴적물과 공극수를 분석하였다. 연구지역에서 채취한 코어퇴적물을 원소 분석한 결과, C/N 및 C/S 비$(wt.\;\%)$는 퇴적물 내 유기물이 주로 해양조류 기원을 가지고, 일반적인 해양 또는 정체 환경에서 퇴적되었음을 지시한다 그러나 열분석 결과는 유기물 기원이 육상식물이고, 열적 성숙단계가 미성숙단계임을 보여준다. 이러한 원소분석과 열분석간의 관계는 유기물이 침강하는 동안 또는 퇴적 후 이루어진 강한 산화작용에 기인한 것으로 추정된다. 퇴적물 내 공극수와 공기층 가스의 분석을 통하여 매몰심도가 증가할수록 $SO_4\;^{2-}$농도는 감소하고, 공기층 가스의 주성분인 $CH_4$의 양이 증가한다는 것을 알 수 있었다 이것은 코어퇴적물에서 미생물과 관련된 황산염 환원작용이 일어났으며, 점진적으로 메탄생성단계로 전이가 일어났음을 의미한다. 또한 $CH_4$의 성분은 열기원보다는 생물기원임을 가리킨다.

Keywords

References

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