Ocean and Polar Research

  • 제42권1호
  • /
  • Pages.33-47
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  • 2020
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  • 1598-141X(pISSN)
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  • 2234-7313(eISSN)
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)
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남서태평양 라우분지 푸누아레이 열곡확장대 인근 퇴적물의 기원과 열수 분출의 증거

Provenance of Sediments and Evidence of Hydrothermal Venting Adjacent to the Fonualei Rift and Spreading Center, Lau Basin, Southwest Pacific

  • 김문기 (한국해양과학기술원 대양자원연구센터) ;
  • 형기성 (한국해양과학기술원 대양자원연구센터) ;
  • 서인아 (전북대학교 자연과학대학 지구환경과학과) ;
  • 유찬민 (한국해양과학기술원 심해저광물자원연구센터)
  • Kim, Mun Gi (Global Ocean Research Center, Korea Institute of Ocean Science & Technology) ;
  • Hyeong, Kiseong (Global Ocean Research Center, Korea Institute of Ocean Science & Technology) ;
  • Seo, Inah (Department of Earth and Environmental Sciences, College of Natural Science Jeonbuk National University) ;
  • Yoo, Chan Min (Deep-sea Mineral Resources Research Center, Korea Institute of Ocean Science & Technology)
  • 투고 : 2019.09.17
  • 심사 : 2020.03.18
  • 발행 : 2020.03.30
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초록

The bulk and partition geochemistry was studied in two sediment cores collected from the axial valley of the north-central Fonualei Rift and Spreading Center (FRSC), Lau back-arc Basin, southwest Pacific. The sediments consist of mostly volcanic ash, although minor amounts of biogenic and other components were present in some intervals. The major element composition of bulk sediments recalculated to a carbonate-free basis was in good agreement with the magma compositions of the adjacent Tofua Arc and the FRSC, with only significant difference in Mn content. The enrichment of Mn and other associated elements (e.g. Cu, Co, Ni, and P) is attributed to hydrothermal input to the sediments, as evidenced by their significant partitioning in the non-detrital phases according to the partition geochemistry. Hydrogenetic and diagenetic inputs were assessed to be relatively insignificant. Estimated hydrothermal Mn fluxes during the Holocene ranged between 5.0 and 37.1 mg cm-2 kyr-1, with the higher values in younger sediments, suggesting enhanced hydrothermal activity. The hydrothermal Mn fluxes comparable to or higher than those reported from other spreading centers with strong hydrothermal activities may indicate the presence of unknown hydrothermal vent sites and/or topographic restriction on the dispersal of hydrothermal plumes in the northern part of the FRSC.

키워드

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