Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Mineralogical-geochemical Characteristics of Manganese Nodules in the Deep Subseafloor Sediments at Site U1371 in the Western South Pacific Gyre Area

남서태평양 환류지역 U1371 심부퇴적층에서 발견된 망가니즈단괴의 광물학적-지화학적 특성 연구

  • Yang, Kiho (Department of Oceanography, College of Natural Sciences, Pusan National University) ;
  • Jung, Jaewoo (Global Ocean Research Center, Korea Institute of Ocean Science & Technology)
  • 양기호 (부산대학교 자연과학대학 해양학과) ;
  • 정재우 (한국해양과학기술원 대양자원연구센터)
  • Received : 2022.04.17
  • Accepted : 2022.05.30
  • Published : 2022.06.30
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Abstract

Manganese nodules were recovered within the deep subseafloor sediments (118.22 mbsf) at Site U1371 during International Ocean Discovery Program (IODP) expedition 329 from the South Pacific Gyre (SPG). Because most manganese nodules exist on the seabed surface, nodules present in deep sediments are uncommon. Therefore, the growth origin of manganese nodules was identified through mineralogical and geochemical analyses. The manganese nodule was divided into the concentric layer outside the manganese region and the inner part of the phosphatized region consisting of manganese oxide minerals and carbonate fluorapatite (CFA) minerals, respectively. The two-dimensional element distribution analysis of Mn, Co, Ni, Sr and Cu, Zn with low Mn/Fe ratio confirmed that manganese nodules were formed predominantly by a hydrogenetic process and a biogenic process in certain manganese layers. As a result, the manganese nodule was continuously precipitated in SPG environments of oligotrophic open paleoocean conditions and rapidly buried with siliceous ooze sediments when the SPG changed to a eutrophic environment. It has been confirmed that manganese nodules found within deep subseafloor sediments could be used as a new proxy for the reconstruction of paleooceanographic conditions.

Keywords

Acknowledgement

본 연구는 2020학년도 부산대학교 교내학술연구비(신임교수연구정착금)와 2020학년도 부산대학교 BK21 FOUR 대학원 혁신지원사업 지원과 한국해양과학기술원에서 수행중인 서태평양 공해/심해저 신 생명자원 및 퇴적물 희유금속 자원 탐사(PEA0024)사업 지원으로 이루어졌음. 본 논문의 발전을 위해 세심한 검토와 아낌없는 조언을 해주신 편집위원과 익명의 심사위원분들께 깊은 감사 드립니다.

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