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http://dx.doi.org/10.4217/OPR.2022012

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

Yang, Kiho (Department of Oceanography, College of Natural Sciences, Pusan National University)
Jung, Jaewoo (Global Ocean Research Center, Korea Institute of Ocean Science & Technology)
Publication Information
Ocean and Polar Research / v.44, no.2, 2022 , pp. 139-145 More about this Journal
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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