The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Geotechnical Properties of Pelagic Red Clay in Northeast Equatorial Pacific

북동태평양 원양성 적점토의 지질공학적 특성에 관한 연구

  • Chi, Sang-Bum (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Lee, Hyun-Bok (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Hyeong, Ki-Seong (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Ju, Se-Jong (Marine Living Resources Research Department, KORDI) ;
  • Lee, Gun-Chang (Deep-sea & Marine Georesources Research Department, KORDI) ;
  • Ham, Dong-Jin (Deep-sea & Marine Georesources Research Department, KORDI)
  • 지상범 (한국해양연구원 심해.해저자원연구부) ;
  • 이현복 (한국해양연구원 심해.해저자원연구부) ;
  • 형기성 (한국해양연구원 심해.해저자원연구부) ;
  • 주세종 (한국해양연구원 해양생물자원연구부) ;
  • 이근창 (한국해양연구원 심해.해저자원연구부) ;
  • 함동진 (한국해양연구원 심해.해저자원연구부)
  • Published : 2008.08.31
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Abstract

In order to understand the physical properties of deep-sea sediments, which mainly consist of pelagic red clays, sediment samples were collected at 24 stations using a multiple corer in the Clarion-Clipperton fracture zone of the northeast equatorial Pacific. The sampled sediment cores were examined for the mass physical properties(i.e. grain size distribution, mean grain size, water content, specific grain density, wet bulk density, void ratio, and porosity) and the geotechnical properties(i.e. shear strength and consistency limits) with the content of biogenic opal and mineral composition. Although KR1 and KR2 areas on the same latitude are logitudinally far from each other, the mass physical properties of these areas are not distinctly different except for shear strengths. The maximum shear strength of surface sediments in KR2 area is higher than that in KR1 due to the appearance of a consolidated lower layer(Unit 3) in the sediment core from KR2.

북동태평양 클라리온-클리퍼톤 균열대(Clarion-Clipperton Fracture Zone, C-C지역) 사이의 북쪽지역에 위치한 연구지역 원양성 적점토 표층퇴적물의 특성파악을 위해 기계적 교란이 적은 다중주상시료채취기로 24개 정점에서 시료를 채취하였다. 채집된 퇴적물 시료의 입도, 함수율, 밀도, 공극률 등 지표 특성과 전단강도, 컨시스턴시 한계 등의 지질공학적 특성 그리고 생물기원 오팔함량 및 광물조성을 분석하였다. 원양성 적점토가 분포하는 광범위한 연구지역($15^{\circ}45'{\sim}16^{\circ}55'N,\;125^{\circ}20'{\sim}134^{\circ}10'W$) 퇴적물의 지표 특성 및 광물학적 특성은 동일 경도 상에서 동측지역과 서측지역 사이의 큰 거리차이에도 불구하고 매우 균일한 특성을 보인다. 단지 표층퇴적물의 전단강도는 KR1 지역에 비해 KR2지역이 고화된 특성을 보이는데, 이것은 KR2 지역에서 나타나는 하부 Unit 3의 영향에 의한 것으로 판단된다.

Keywords

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