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Conference Paper: Quartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia
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TitleQuartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia
 
AuthorsZhu, S
Li, Y
 
KeywordsEarth sciences
Geology
 
Issue Date2010
 
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
 
CitationGoldschmidt 2010: Earth, Energy, and the Environment, Knoxville, TN., 13–18 June 2010. In Geochimica et Cosmochimica Acta, 2010, v. 74 n. 12 suppl., p. A1234 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gca.2010.04.052
 
AbstractThe 2461-2495 million year old banded iron formation (BIF) from Dales Gorge Formation, Hamersley, Western Australia contains hematite, magnetite, Fe (II)-silicate, quartz, carbonates and apatite [1]. Massive hematite were observed to contain quartz nanoparticles with size ranged from <100 nm to 400 nm. Electron dispersive spectroscopic (EDS) measurements indicated their chemical compositions are close to quartz. Fourier infrared probe also showed a Si-O composition. Some quartz crystals were observed on the surface of massive aggregates of hematite (Figure 1), more quartz nanoparticles could be found inside the etching cavities bigger than quartz in hematite aggregates with a few etching cavities contain two quartz nanoparticles. All those quartz nanoparticles have euhedral faces. Those quartz nanoparticles are common in the anhedral hematite aggregates, but different from quartz crystals in the BIF assemblage which were bigger. Quartz nanoparticles are the only mineral that can be observed in the etching cavities, and they were the only mineral observed in hematite. This implied their formation was short after the precipitation of hematite, but earlier than magnetite, iron-silicates and carbonates. Those particles on the surface of hematite appeared tightly fixed in the etching cavities indicated undisturbed hydrological condition, while the crystals in bigger etching cavities implied a poppling hydrodynamic condition. We suggest that those quartz nanoparticles fell on the just precipitated hematite iron-gel in the shallow oxidized sea environment with an exogenesis. It implied that hematite was the only chemical phase at the early stage of banded iron deposition.
 
DescriptionThis journal supplement is the 2010 Goldschmidt Conference Abstracts
Poster Session - 02d: Precambrian sediments as records of early earth tectonics and ocean-atmosphere-biosphere interactions, no. 35 - Open URL: http://goldschmidt.info/2010/program/programViewfa73.html?session=02d#abstract_2602
 
ISSN0016-7037
2012 Impact Factor: 3.884
2012 SCImago Journal Rankings: 2.149
 
DOIhttp://dx.doi.org/10.1016/j.gca.2010.04.052
 
DC FieldValue
dc.contributor.authorZhu, S
 
dc.contributor.authorLi, Y
 
dc.date.accessioned2010-10-31T14:05:55Z
 
dc.date.available2010-10-31T14:05:55Z
 
dc.date.issued2010
 
dc.description.abstractThe 2461-2495 million year old banded iron formation (BIF) from Dales Gorge Formation, Hamersley, Western Australia contains hematite, magnetite, Fe (II)-silicate, quartz, carbonates and apatite [1]. Massive hematite were observed to contain quartz nanoparticles with size ranged from <100 nm to 400 nm. Electron dispersive spectroscopic (EDS) measurements indicated their chemical compositions are close to quartz. Fourier infrared probe also showed a Si-O composition. Some quartz crystals were observed on the surface of massive aggregates of hematite (Figure 1), more quartz nanoparticles could be found inside the etching cavities bigger than quartz in hematite aggregates with a few etching cavities contain two quartz nanoparticles. All those quartz nanoparticles have euhedral faces. Those quartz nanoparticles are common in the anhedral hematite aggregates, but different from quartz crystals in the BIF assemblage which were bigger. Quartz nanoparticles are the only mineral that can be observed in the etching cavities, and they were the only mineral observed in hematite. This implied their formation was short after the precipitation of hematite, but earlier than magnetite, iron-silicates and carbonates. Those particles on the surface of hematite appeared tightly fixed in the etching cavities indicated undisturbed hydrological condition, while the crystals in bigger etching cavities implied a poppling hydrodynamic condition. We suggest that those quartz nanoparticles fell on the just precipitated hematite iron-gel in the shallow oxidized sea environment with an exogenesis. It implied that hematite was the only chemical phase at the early stage of banded iron deposition.
 
dc.description.naturelink_to_OA_fulltext
 
dc.descriptionThis journal supplement is the 2010 Goldschmidt Conference Abstracts
 
dc.descriptionPoster Session - 02d: Precambrian sediments as records of early earth tectonics and ocean-atmosphere-biosphere interactions, no. 35 - Open URL: http://goldschmidt.info/2010/program/programViewfa73.html?session=02d#abstract_2602
 
dc.description.otherGoldschmidt 2010: Earth, Energy, and the Environment, Knoxville, TN., 13–18 June 2010. In Geochimica et Cosmochimica Acta, 2010, v. 74 n. 12 suppl., p. A1234
 
dc.identifier.citationGoldschmidt 2010: Earth, Energy, and the Environment, Knoxville, TN., 13–18 June 2010. In Geochimica et Cosmochimica Acta, 2010, v. 74 n. 12 suppl., p. A1234 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gca.2010.04.052
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.gca.2010.04.052
 
dc.identifier.epageA1234
 
dc.identifier.hkuros176211
 
dc.identifier.issn0016-7037
2012 Impact Factor: 3.884
2012 SCImago Journal Rankings: 2.149
 
dc.identifier.issue12 suppl.
 
dc.identifier.spageA1234
 
dc.identifier.urihttp://hdl.handle.net/10722/128116
 
dc.identifier.volume74
 
dc.languageeng
 
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofGeochimica et Cosmochimica Acta
 
dc.subjectEarth sciences
 
dc.subjectGeology
 
dc.titleQuartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia
 
dc.typeConference_Paper
 
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