한국광물학회지 (Journal of the Mineralogical Society of Korea)

  • 제26권2호
  • /
  • Pages.65-80
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  • 2013
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  • 1225-309X(pISSN)
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  • 2288-7172(eISSN)
한국광물학회 (The Mineralogical Society of Korea)
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독도 인근 해저퇴적물과 유기 퇴적물 분포 특성

Characterization of Clastic and Organic Sediments Near Dokdo, Korea

  • 전창표 (경북대학교 지질학과) ;
  • 김창환 (한국해양과학기술원 동해연구소 독도전문연구센터) ;
  • 이성주 (경북대학교 지질학과)
  • Jun, Chang Pyo (Department of Geology, Kyungpook National University) ;
  • Kim, Chang Hwan (East Sea Research, Korea Institute of Ocean Science & Technology (KIOST)) ;
  • Lee, Seong-Joo (Department of Geology, Kyungpook National University)
  • 투고 : 2013.05.29
  • 심사 : 2013.06.19
  • 발행 : 2013.06.30
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초록

독도로부터의 거리 및 수심에 따라 채취된 표층 퇴적물에 대하여 입도분석, 광물분석, 유기물 분석 및 미화석 분석 결과를 이용하여 독도 인근 해저의 퇴적 기작 및 유기 퇴적물의 분포를 규명하였다. 독도 인근 해저 퇴적물은 자갈 및 사질이 우세하며, 끌림에 의한 퇴적 작용이 주를 이루는 반면에 독도와 거리가 멀어짐에 따라 실트와 머드의 비율이 증가하며 점토광물과 장석 등의 광물 성분의 변화를 보이고 뜬짐에 의한 퇴적이 우세해지는 경향을 보인다. 퇴적물에 포함된 유기 퇴적물의 군집 조성 또한 큰 변화를 보이는데, 연안 퇴적물에서는 해양 기원의 유기 퇴적물이, 심해 퇴적물에서는 육상 기원의 유기 퇴적물이 우점한다. 이러한 유기 퇴적물의 군집 변화는 퇴적물의 입도에 큰 영향을 받는 것으로 밝혀졌으며 유기 퇴적물중 높은 화분 농집도는 심해 퇴적물의 유기탄소 함량을 증가시키는데 중요한 역할을 하는 것으로 판단된다.

Sediment transport mechanism and distribution of organic sediments are elucidated by the study of particle size, mineralogy, organic matters and microfossils of the surface samples collected from seafloor adjacent Dokdo island. Shallow marine sediments are dominated by coarse- grained sediments including gravel and sand, and their sedimentation has mainly been controlled by traction. While the samples collected from oceanic zone are characterized by high contents of fine- grained sediments such as silt and mud in bulk sediments, and the changes of mineral compositions including clay minerals and feldspar, and the fine sediments have been deposited mainly by suspension. The change of organic sedimentary communities is detected between neritic and oceanic zone. Although marine organic matter is predominant in neritic zone, terrestrial organic matter is monopolized according to increasing water depth. This trend is associated with grain size of sediments. The results also suggest that high pollen concentrations in whole organic matters may played an important role in excessive organic carbon in sediment.

키워드

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