Mineralogical-geochemical Characteristics of Manganese Nodules in the Deep Subseafloor Sediments at Site U1371 in the Western South Pacific Gyre Area

Kiho Yang; Jaewoo Jung

doi:10.4217/OPR.2022012

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2022 Vol.44, Issue 2 Preview Page Next Page

Article

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

30 June 2022. pp. 139-145

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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

Manganese nodule

South Pacific Gyre

deep subseafloor sediments

international ocean discovery program

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Information

Publisher :Korea Institute of Ocean Science and Technology
Publisher(Ko) :한국해양과학기술원
Journal Title :Ocean and Polar Research
Journal Title(Ko) :Ocean and Polar Research
Volume : 44
No :2
Pages :139-145
Received Date : 2022-04-17
Revised Date : 2022-05-30
Accepted Date : 2022-05-30
DOI :https://doi.org/10.4217/OPR.2022012

Ocean and Polar Research ISSN:2234-7313(Online) Ocean and Polar Research

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