Electron microscopy study on the formation of ferromanganese crusts, western Pacific Magellan Seamounts SCIE SCOPUS

Cited 4 time in WEB OF SCIENCE Cited 5 time in Scopus
Title
Electron microscopy study on the formation of ferromanganese crusts, western Pacific Magellan Seamounts
Author(s)
Yang, Kiho; Park, Hanbeom; Son, Seung-Kyu; Baik, Hionsuck; Park, Kyeongryang; Kim, Jonguk; Yoon, Junbeom; Park, Chan Hong; Kim, Jinwook
KIOST Author(s)
Son, Seung Kyu(손승규)Kim, Jonguk(김종욱)
Publication Year
2019-04
Abstract
Variations in mineralogy and chemical composition, layer structures, redox states of Fe and Mn, and microbial diversity are closely linked to the biogeochemical process when a ferromanganese crust layer forms. A sample collected from the Magellan Seamount (OSM11), in the western Pacific, was characterized in five well-defined layers, top to bottom (L1-5). Fe-vernadite occurs in all layers, compared to detritus quartz, feldspar, goethite, and hematite in Li and L3, and carbonate fluorapatite (CFA) in L4-5. The relatively high concentrations of Ca and P in L4-5, and Fe, Co, and Si in L1 and L3 correspond to the mineralogical variations in the crust layer. Disappearance of elongated voids along the convex growth line is likely due to void filling precipitation of CFA in L4-5, resulting in the void reduction (31.6 to 6.0%). The oxidation states of Fe in Fe-vernadite measured by electron energy loss spectroscopy (EELS) ranges from 36 to 63% of Fe3+/Fe-tot, and a layer where CFA appeared (L4) contains a more reductive form of Fe (Fe3+/Fe-tot = 36-48%). Presence of Fe- (coxC) and Mn-oxidizing gene (cumA), particularly displaying a strong PCR band of coxC in L2-3, indicates a dominant oxidizing condition. Direct evidence of microbial activity in Fe - and Mn-oxide precipitation with various redox conditions was identified in the focused ion beam-sectioned microfossil. Particularly, a spectrum image displaying a more reducing form of Fe around the voids previously occupied by microorganisms, strongly supports that microorganisms play an important role in the redox reaction in the growth of a crust.
ISSN
0025-3227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/651
DOI
10.1016/j.margeo.2019.01.001
Bibliographic Citation
MARINE GEOLOGY, v.410, pp.32 - 41, 2019
Publisher
ELSEVIER SCIENCE BV
Subject
FE-MN CRUSTS; COBALT-RICH; SUBSTRATE ROCKS; IRON OXIDATION; NODULES; REDUCTION; ATLANTIC; ELEMENTS; FE(III); GENES
Keywords
CFA; EELS; Ferromanganese crust; Focused ion beam; Microbial activity; Redox states; Spectrum image
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

marine chemistry,Environmental Monitoring,resource development,해양화학,환경모니터링,자원개발

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