자원환경지질 (Economic and Environmental Geology)

  • 제45권5호
  • /
  • Pages.477-486
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  • 2012
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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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북동태평양 한국 KODOS 연구지역 중 KR1 지역 망간단괴의 지역적인 특성 변화

Regional Variability of Manganese Nodule Facies in the KR1 Area in KODOS Area, Northeastern Equatorial Pacific

  • 이현복 (한국해양과학기술원 남해연구소 해양시료도서관) ;
  • 김원년 (한국해양과학기술원 심해저자원연구부) ;
  • 고영탁 (한국해양과학기술원 심해저자원연구부) ;
  • 김종욱 (한국해양과학기술원 심해저자원연구부) ;
  • 지상범 (한국해양과학기술원 심해저자원연구부) ;
  • 박정기 (한국해양과학기술원 종합연구선건조사업단)
  • Lee, Hyun-Bok (Library of Marine Samples(LIMS), South Sea Research Institute, KIOST) ;
  • Kim, Wonnyon (Deep-sea & Seabed Resources Research Division, KIOST) ;
  • Ko, Young-Tak (Deep-sea & Seabed Resources Research Division, KIOST) ;
  • Kim, Jonguk (Deep-sea & Seabed Resources Research Division, KIOST) ;
  • Chi, Sang-Bum (Deep-sea & Seabed Resources Research Division, KIOST) ;
  • Park, Cheong-Kee (Research Vessel Building Unit, KIOST)
  • 투고 : 2012.07.24
  • 심사 : 2012.10.16
  • 발행 : 2012.10.28
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초록

북동태평양 대한민국 망간단괴 광구중 하나인 KR1 지역에서 망간단괴의 분포특성을 파악하기 위하여 정밀수심 측량과 망간단괴의 특성(외형, 조직, 크기, 금속함량) 분석을 수행하였다. 작고(<2 cm), 매끄럽고(s-형), 불규칙하고(I-형), Fe의 함량이 높은 망간단괴가 KR1의 북동부(KR1-2) 지역에 우세하게 분포하는 것에 비하여, KR1의 남서부(KR1-1) 지역에서는 상대적으로 Mn, Cu, Ni의 함량이 높고, 크고(2~4 cm), 거칠고(t-형, d-형), 원반형(D-형)의 망간단괴가 우세하게 분포하는 것으로 나타났다. 정밀수심 자료에 의하면 상대적으로 KR1-1 지역은 수심이 깊고(3,838~4,799 m; 평균 4,599 m), KR1-2 지역은 3,940~4,664 m (평균: 4,451 m)의 수심을 보이며 소규모의 해저산이 발달해 있다. KR1 지역에서 나타나는 이러한 수심과 망간단괴에 포함된 Mn, Cu, Ni의 함량과의 상관성은 태평양 전역에 걸쳐 나타나는 일반적인 특성과도 일치한다. 또한 망간단괴의 크기와 형태와 관련하여, KR1-2 지역에 분포하고 있는 소규모 해저산에서부터 망간단괴의 핵으로 사용되는 암편의 공급이 원활하기 때문에 작고 매끄럽고 불규칙한 초기 형태의 망간단괴가 주로 분포하고 있는 것으로 판단된다. 이러한 연구결과는 망간단괴의 분포특성에 있어서, 수심과 더불어 해저지형의 특성이 중요한 변수로 작용할 수 있음을 보여준다.

High-resolution bathymetry and physico-chemical properties of manganese nodules were explored to identify the relationship between morphological features and nodule occurrences in the KR1, one of the Korean contract nodule fields located in the NE Pacific. The high-resolution seabed mapping showed that the southwestern sector of the KR1 (KR1-1) was relatively deeper than the northeastern sector (KR1-2) which is occupied by small-scale seamounts. In terms of nodule occurrence, manganese nodules in the KR1-1 were comparatively larger (2-4 cm) with rough surface (t-type) and discoidal shapes (D-type), while those in the KR1-2 were generally small (<2 cm) with smooth surface (s-type) and irregular shapes (I-type). In addition, the nodules in the KR1-1 had higher contents of Cu, Mn and Ni. Such connections of water depths to nodule appearances and metal contents are commonly observed in the Pacific nodule fields. On the other hand, the nodules in the KR1-2 tend to be controled by morphological features. The seamounts in the KR1-2 might continuously provide rock fragments as new nuclei of manganese nodules. As a result, the nodules could not grow over than 2 cm and showed the shapes of a newbie (i.e., smooth surface and irregular shapes). As a result, our observations indicate that occurrence features of manganese nodules could be subjected to water depths and seabed morphology simultaneously.

키워드

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피인용 문헌

  1. Stratigraphy of a Sediment Core Collected from the NE Equatorial Pacific Using Reversal Patterns of Geomagnetic Field and Be Isotope Ratio vol.36, pp.4, 2014, https://doi.org/10.4217/OPR.2014.36.4.395