자원환경지질 (Economic and Environmental Geology)

  • 제36권1호
  • /
  • Pages.9-15
  • /
  • 2003
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  • 1225-7281(pISSN)
  • /
  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
권호 표지

울릉분지 남서부 해역의 제4기 후기 퇴적환경에 대한 지질${\cdot}$지화학적 연구

Geological and Geochemical Studies on the Late Quaternary Sedimentary Environment of the Southwestern Ulleung Basin, East Sea.

  • 김일수 (연세대학교 지구시스템과학과) ;
  • 박명호 (한국지질자원연구원 석유 해저자원연구부) ;
  • 이영주 (한국지질자원연구원 석유 해저자원연구부) ;
  • 류병재 (한국지질자원연구원 석유 해저자원연구부) ;
  • 유강민 (연세대학교 지구시스템과학과)
  • 발행 : 2003.02.01
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초록

울릉분지 남서부 해역에서 두 개의 코어(00GHP-01, 00GHP-07)를 시추하였다. 채취된 코어의 제4기 후기 퇴적환경 변화 및 지화학적 특성을 연구하였다. 유기탄소의 함량은 일반적인 개방형 해양보다 높게(평균 1.8%) 측정되었다. 기존의 보고된 테프라층 연대를 이용한 지층의 층서에 따르면 울릉분지는 높은 퇴적률(12.1-14.9 cm/kyr)을 보이는 환경이었을 것으로 추정된다. 질소와 유기탄소의 비(평균 6.18-7.42)는 퇴적되어진 유기물이 주로 해양성 유기물에서 비롯된 것으로 보인다. 퇴적률과 황의 함량을 각각 유기탄소의 함량과 비교하여 도시해 본 결과, 산소가 결핍되고 다소 생산성이 높은 환경이었을 것으로 생각된다. 연구지역은 Termination I 동안에 유기물의 유입이 많았으며, 유입된 유기물들이 축척되기 용이한 높은 퇴적률을 갖는 산소가 결핍된 환경이었던 것으로 생각된다.

Two piston cores, obtained from the southwestern Ulleung Basin in East Sea, were analyzed to study the geochemical characteristics of the late Quaternary sediments and to detect any changes in sedimentary environment. The results show that the capacity of Total Organic Carbon is remarkably higher (average 1.8%) than that known from general open-sea. According to tephrochronology from known eruption ages, the sedimentation rates are high, ranging from 12.1 to 14.9 cm/kyr. The ratios of nitrogen and TOC (average 6.18-7.42) imply that the organic matter in the study area would be of oceanic origin. The correlation between sedimentation rates and sulfur contents suggests that the study area may be on the whole anoxic and somewhat high in primary productivity. During the Termination 1, inflows of organic matters were high. The sedimentary environments are characterized by rapid rates of sedimentation, and high anoxic values were compatible with accumulation of organic matters.

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참고문헌

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