The characterization of ferromanganese crust and its redox change, Western Pacific Magellan seamounts

DC Field Value Language
dc.contributor.author 양기호 -
dc.contributor.author 김진욱 -
dc.contributor.author 박한범 -
dc.contributor.author 백현석 -
dc.contributor.author 박경량 -
dc.contributor.author 김종욱 -
dc.date.accessioned 2020-07-15T22:33:21Z -
dc.date.available 2020-07-15T22:33:21Z -
dc.date.created 2020-02-11 -
dc.date.issued 2015-12-15 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/24982 -
dc.description.abstract Biotic/abiotic redox reaction is a ubiquitous process in mineral formation and growth, and changes in elemental redox states, particularly Fe/Mn may reflect the redox conditions in the sediment/ocean when the mineral forms. Samples were dredged from the seamounts in the western Pacific, OSM11 in order to investigate the formation, growth and its implications to geological history. The crust consist of five well-defined layers (here after called “layer 1” (rim) through “layer 5” (core)). Quartz, feldspar, and hematite are detected only in the layer 1 in addition to the poorly crystallined Fe-rich vernadite, which is likely to be associated with slower growth rate compared to the layers 2-5. CFA were identified in layers 4 and 5 under XRD measurement. Visible size of white colored well crystallined CFA were only observed in layer 4 whereas nano-sized CFA in layer 5 were identified by TEM. Clay minerals such as smectite were observed by TEM with SAED pattern and EDX in layers 1 and 3. The oxidation states of Fe and Mn in Fe-rich vernadite in entire layers were determined by EELS analysis. All the layers of Mn oxide minerals was consisted with dominantly Mn4+, which is consistent with appearance of vernadite in Fe-Mn crust. Fe-rich vernadite in layers 1 and 4 were consisted with 26-52 % of Fe3+/Fetot, dominant reduced form of Fe compared to layers 2, 3, and 5. The observed alternative patterns of Fe oxidation state dged from the seamounts in the western Pacific, OSM11 in order to investigate the formation, growth and its implications to geological history. The crust consist of five well-defined layers (here after called “layer 1” (rim) through “layer 5” (core)). Quartz, feldspar, and hematite are detected only in the layer 1 in addition to the poorly crystallined Fe-rich vernadite, which is likely to be associated with slower growth rate compared to the layers 2-5. CFA were identified in layers 4 and 5 under XRD measurement. Visible size of white colored well crystallined CFA were only observed in layer 4 whereas nano-sized CFA in layer 5 were identified by TEM. Clay minerals such as smectite were observed by TEM with SAED pattern and EDX in layers 1 and 3. The oxidation states of Fe and Mn in Fe-rich vernadite in entire layers were determined by EELS analysis. All the layers of Mn oxide minerals was consisted with dominantly Mn4+, which is consistent with appearance of vernadite in Fe-Mn crust. Fe-rich vernadite in layers 1 and 4 were consisted with 26-52 % of Fe3+/Fetot, dominant reduced form of Fe compared to layers 2, 3, and 5. The observed alternative patterns of Fe oxidation state -
dc.description.uri 1 -
dc.language English -
dc.publisher American Geophysical Union -
dc.relation.isPartOf AGU Fall Meeting -
dc.title The characterization of ferromanganese crust and its redox change, Western Pacific Magellan seamounts -
dc.type Conference -
dc.citation.conferencePlace US -
dc.citation.endPage 1 -
dc.citation.startPage 1 -
dc.citation.title AGU Fall Meeting -
dc.identifier.bibliographicCitation AGU Fall Meeting, pp.1 -
dc.description.journalClass 1 -
Appears in Collections:
Marine Resources Research Division > Deep-sea Mineral Resources Research Center > 2. Conference Papers
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