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

Title
Mineralogical-geochemical Characteristics of Manganese Nodules in the Deep Subseafloor Sediments at Site U1371 in the Western South Pacific Gyre Area
Alternative Title
남서태평양 환류지역 U1371 심부퇴적층에서 발견된 망가니즈단괴의 광물학적-지화학적 특성 연구
Author(s)
Yang, Kiho; Jung, Jaewoo
KIOST Author(s)
Jung, Jaewoo(정재우)
Alternative Author(s)
정재우
Publication Year
2022-06
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.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43040
DOI
10.4217/OPR.2022012
Bibliographic Citation
Ocean and Polar Research, v.44, no.2, pp.139 - 145, 2022
Publisher
Korea Ocean Research and Development Institute
Keywords
Manganese nodule; South Pacific Gyre; deep subseafloor sediments; international ocean discovery program
Type
Article
Language
Korean
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