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

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Title	Quartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia
Authors	Zhu, S Li, Y
Keywords	Earth sciences Geology
Issue Date	2010
Publisher	Pergamon. 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?] DOI: http://dx.doi.org/10.1016/j.gca.2010.04.052
Abstract	The 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.
Description	This 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
ISSN	0016-7037 2011 Impact Factor: 4.259 2011 SCImago Journal Rankings: 0.270
DOI	http://dx.doi.org/10.1016/j.gca.2010.04.052

DC Field	Value
dc.contributor.author	Zhu, S
dc.contributor.author	Li, Y
dc.date.accessioned	2010-10-31T14:05:55Z
dc.date.available	2010-10-31T14:05:55Z
dc.date.issued	2010
dc.description.abstract	The 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.nature	link_to_OA_fulltext
dc.description	This journal supplement is the 2010 Goldschmidt Conference Abstracts
dc.description	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
dc.description.other	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
dc.identifier.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?] DOI: http://dx.doi.org/10.1016/j.gca.2010.04.052
dc.identifier.doi	http://dx.doi.org/10.1016/j.gca.2010.04.052
dc.identifier.epage	A1234
dc.identifier.hkuros	176211
dc.identifier.issn	0016-7037 2011 Impact Factor: 4.259 2011 SCImago Journal Rankings: 0.270
dc.identifier.issue	12 suppl.
dc.identifier.spage	A1234
dc.identifier.uri	http://hdl.handle.net/10722/128116
dc.identifier.volume	74
dc.language	eng
dc.publisher	Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
dc.publisher.place	United Kingdom
dc.relation.ispartof	Geochimica et Cosmochimica Acta
dc.subject	Earth sciences
dc.subject	Geology
dc.title	Quartz nanoparticles in 2461-2495 million years old banded iron formation from Dales Gorge, Hamersley, Western Australia
dc.type	Conference_Paper

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