Growth of diagenetic ferromanganese nodules in an oxic deep-sea sedimentary environment, northeast equatorial Pacific SCIE SCOPUS

Cited 17 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
Growth of diagenetic ferromanganese nodules in an oxic deep-sea sedimentary environment, northeast equatorial Pacific
Author(s)
Jung, HS; Lee, CB
KIOST Author(s)
Jung, Hoi Soo(정회수)
Publication Year
1999-05
Abstract
To study the accretion mechanism of diagenetic ferromanganese nodules formed in an oxic deep-sea sedimentary environment, manganese nodules, sediments, and pore waters were sampled in the northeast equatorial Pacific. Diagenetic ferromanganese nodules are ellipsoidal to discoidal in shape, rough in surface texture, enriched in Cu, Ni and 10 Angstrom-manganite, and are ubiquitous on the abyssal plain; hydrogenetic nodules are polynucleated, irregular in shape, smooth in surface texture, enriched in Co and delta-MnO2, and occur dominantly on seamounts. Numerous microlayers with diagenetic or hydrogenetic characteristics occur successively in the nodules. Concentration of nitrate in sediment pore waters indicates that overall redox conditions are oxic. However, Mn-oxide grains on the walls of burrows and worm tubes are interpreted to be reprecipitated metal ions supplied from oxygen-depleted microenvironments that formed in the oxic sediment column by decomposition of organic matter. Active mixing of bottom sediments by benthic fauna and bottom currents is indicated by ubiquitous burrows, worm tubes, and tracks and trails, high values in sediment mixing coefficients (>1 cm(2)/yr), and scattering of data points in depth profiles of pore water nitrate concentrations. We suggest that diagenetic ferromanganese nodules in an oxic deep-sea sedimentary environment grew from remobilized metal ions as well as reprecipitated Mn-oxide grains, which were supplied to the nodules episodically during the stirring of bottom sediments by benthic fauna and intermittent strong bottom current flow. (C) 1999 Elsevier Science B.V. All rights reserved.
ISSN
0025-3227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/6164
DOI
10.1016/S0025-3227(98)00154-6
Bibliographic Citation
MARINE GEOLOGY, v.157, no.3-4, pp.127 - 144, 1999
Publisher
ELSEVIER SCIENCE BV
Subject
PELAGIC MARINE-SEDIMENTS; PARTICLE MIXING RATES; DOMES SITE-A; MANGANESE NODULES; CHEMICAL-COMPOSITION; PORE WATERS; OCEAN; MINERALOGY; PB-210; MN
Keywords
diagenetic ferromanganese nodules; sediment mixing; oxygen-depleted microenvironment; bioturbation; pore water
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

marine geochemistry,sediment diagenesis,marine environment,해양지화학,퇴적물 속성작용,해양환경

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