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Conference Paper: Quartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia

TitleQuartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia
Authors
KeywordsEarth sciences
Geology
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
Citation
Goldschmidt 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?
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
Persistent Identifierhttp://hdl.handle.net/10722/128116
ISSN
2014 Impact Factor: 4.331
2014 SCImago Journal Rankings: 2.284

 

DC FieldValueLanguage
dc.contributor.authorZhu, Sen_HK
dc.contributor.authorLi, Yen_HK
dc.date.accessioned2010-10-31T14:05:55Z-
dc.date.available2010-10-31T14:05:55Z-
dc.date.issued2010en_HK
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. A1234en_HK
dc.identifier.issn0016-7037en_HK
dc.identifier.urihttp://hdl.handle.net/10722/128116-
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.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.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca-
dc.relation.ispartofGeochimica et Cosmochimica Actaen_HK
dc.subjectEarth sciences-
dc.subjectGeology-
dc.titleQuartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australiaen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailZhu, S: syzhu@hku.hken_HK
dc.identifier.emailLi, Y: yiliang@hku.hken_HK
dc.identifier.authorityLi, Y=rp01354en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1016/j.gca.2010.04.052-
dc.identifier.hkuros176211en_HK
dc.identifier.volume74en_HK
dc.identifier.issue12 suppl.-
dc.identifier.spageA1234en_HK
dc.identifier.epageA1234-
dc.publisher.placeUnited Kingdom-
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-

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