자원환경지질 (Economic and Environmental Geology)

  • 제47권1호
  • /
  • Pages.71-85
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  • 2014
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
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ODP Leg 204 Site 1249C와 Site 1251B 퇴적물의 유기물 기원 및 지화학적 특성

The Characteristic and Origin of Organic Matter in the ODP Leg 204 Site 1249C and Site 1251B

  • 심은형 (충남대학교 지질환경과학과) ;
  • 윤혜수 (충남대학교 지질환경과학과) ;
  • 이영주 (한국지질자원연구원) ;
  • 한상영 (충남대학교 지질환경과학과)
  • Shim, Eun-Hyoung (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Yun, Hye-Su (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Lee, Young-Joo (Petroelum and Marine Resources Research Division, KIGAM) ;
  • Han, Sang-Young (Department of Geology and Earth Environmental Sciences, Chungnam National University)
  • 투고 : 2013.11.14
  • 심사 : 2014.01.09
  • 발행 : 2014.02.28
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초록

오레곤 대륙 주변부 남부 하이드레이트 릿지에서 실시한 ODP Leg 204에서 회수한 코어 Site 1249C와 Site 1251B의 유기물 기원 및 유기지화학적 특성을 규명하기 위하여 원소분석과 Rock-Eval 열분석 및 동위원소 비 분석을 실시하였다. 분석결과 Site 1249C와 Site 1251B의 유기물은 해양기원 유기물이 우세하며 이러한 결과는 퇴적물의 퇴적당시 환경이 일반적인 해양 환경이었음을 시사한다. 그러나 Rock-Eval 열분석 결과는 다른 분석결과와 반대의 결과를 나타내는데 이러한 결과는 열적으로 미성숙한 유기물이 열분석 과정에서 유기물의 특성이 제대로 반영되지 못하기 때문이다. 따라서 열분석 결과 해석은 다양한 지화학적 결과를 종합하여 해석할 필요가 있다. 코어의 유기물 기원이 동일함에도 불구하고 Site 1249C는 전 구간에서 가스 하이드레이트의 집적이 높은 반면, Site 1251B는 가스 하이드레이트가 일부 구간에서만 소량 발견되었다. 이러한 결과는 하이드레이트 정상부에 위치한 Site 1249C는 가스 하이드레이트 생성에 필요한 심부 열기원 가스가 천부 퇴적물로 이동할 수 있는 이동 통로(Horizon A, BSR2)가 존재하는 것을 시사한다. 그러나 가스 하이드레이트 집적이 미비한 분지 지역의 Site 1251B는 열기원 가스가 심부로부터 이동할 수 있는 가스 이동 통로가 제한적이고 그에 따른 가스 공급이 원활하게 이루어지지 않기 때문에 현장 퇴적물의 속성작용에 의한 생물기원 가스가 우세하여 가스 하이드레이트 생성이 제한적인 것으로 추정된다.

To study biogeochemical characteristics and origin organic matter, sediment samples were taken from Site of 1249C and Stie 1251B of ODP Leg 204. Data of Rock-Eval, isotope, and element analysis generally indicate dominance of marine organic matter in sediments deposited under marine sedimentary environment. Only Rock-Eval data are somewhat different from those of others owing to under-maturation of organic matter. Samples of Site 1249C show high content of gas hydrate, whereas Site 1251B low content of gas hydrate in some intervals of the core. This result may be accounted to different location of two cores and presence of transportation passage (Horizon A, BSR 2) of thermogenic gas in the core, 1249 C. However, Site 1251B Located in the basin of low accumulation of gas hydrate is presumed to be limited in the gas hydrate production. Because not only transportation passage is limited to move thermogenic gas from the core, but also gas supply was not enough. Therefore, the biogenic gas that resulted from diagenesis of there sediment is superior.

키워드

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