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Article: Quartz nanocrystals in the 2.48 Ga Dales Gorge banded iron formation of Hamersley, Western Australia: Evidence for a change from submarine to subaerial volcanism at the end of the Archean

TitleQuartz nanocrystals in the 2.48 Ga Dales Gorge banded iron formation of Hamersley, Western Australia: Evidence for a change from submarine to subaerial volcanism at the end of the Archean
Authors
KeywordsBanded iron formation
Chert
Quartz nanocrystal
Subaerial volcanism
Rise of atmospheric
Issue Date2013
PublisherMineralogical Society of America. The Journal's web site is located at http://www.minsocam.org/MSA/AmMin/AmMineral.html
Citation
American Mineralogist, 2013, v. 98 n. 4, p. 582-587 How to Cite?
AbstractBanded iron formations (BIF) have recently been used as proxies for tracking the chemical changes associated with the transition from an anoxic to oxic atmosphere around 2.45 billion years ago, known as the Great Oxidation Event (GOE). The timing of the GOE has been ascribed to both the collapse of a methane greenhouse and a decreased overall demand for oxygen due to the production of more oxidizing gases associated with greater subaerial volcanism. The latter is a byproduct of a period of high mantle plume activity and the formation of new continental crust between 2.51 to 2.45 Ga. Here we report unique mineral evidence for momentary subaerial volcanism recorded in hematite-rich layers of the 2.48 Ga BIF from Dales Gorge, Hamersley of Western Australia. The BIF contains euhedral quartz nanocrystals (QNC), which only occur on the surfaces or in cavities of hematite breccias exhibiting soft-sediment features and an exogenous source. These QNCs with an average size of 170–100 nm are distinct to the amorphous chert in the BIF mineral assemblage and have the smallest crystal sizes of well-crystallized quartz ever reported. We suggest that QNCs represent pyroclastic materials that were transported as dust particles to the BIF depositional setting. Although the analysis of one specific BIF unit does not provide proof of changing modes of volcanism during the Archean-Paleoproterozic transition, this high-resolution petrological study does confirm that subaerial volcanism existed at that time.
Persistent Identifierhttp://hdl.handle.net/10722/183103
ISSN
2015 Impact Factor: 1.918
2015 SCImago Journal Rankings: 1.185
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, YLen_US
dc.contributor.authorCole, DRen_US
dc.contributor.authorKonhauser, Ken_US
dc.contributor.authorChan, LSen_US
dc.date.accessioned2013-05-15T01:42:34Z-
dc.date.available2013-05-15T01:42:34Z-
dc.date.issued2013en_US
dc.identifier.citationAmerican Mineralogist, 2013, v. 98 n. 4, p. 582-587en_US
dc.identifier.issn0003-004X-
dc.identifier.urihttp://hdl.handle.net/10722/183103-
dc.description.abstractBanded iron formations (BIF) have recently been used as proxies for tracking the chemical changes associated with the transition from an anoxic to oxic atmosphere around 2.45 billion years ago, known as the Great Oxidation Event (GOE). The timing of the GOE has been ascribed to both the collapse of a methane greenhouse and a decreased overall demand for oxygen due to the production of more oxidizing gases associated with greater subaerial volcanism. The latter is a byproduct of a period of high mantle plume activity and the formation of new continental crust between 2.51 to 2.45 Ga. Here we report unique mineral evidence for momentary subaerial volcanism recorded in hematite-rich layers of the 2.48 Ga BIF from Dales Gorge, Hamersley of Western Australia. The BIF contains euhedral quartz nanocrystals (QNC), which only occur on the surfaces or in cavities of hematite breccias exhibiting soft-sediment features and an exogenous source. These QNCs with an average size of 170–100 nm are distinct to the amorphous chert in the BIF mineral assemblage and have the smallest crystal sizes of well-crystallized quartz ever reported. We suggest that QNCs represent pyroclastic materials that were transported as dust particles to the BIF depositional setting. Although the analysis of one specific BIF unit does not provide proof of changing modes of volcanism during the Archean-Paleoproterozic transition, this high-resolution petrological study does confirm that subaerial volcanism existed at that time.-
dc.languageengen_US
dc.publisherMineralogical Society of America. The Journal's web site is located at http://www.minsocam.org/MSA/AmMin/AmMineral.htmlen_US
dc.relation.ispartofAmerican Mineralogisten_US
dc.subjectBanded iron formation-
dc.subjectChert-
dc.subjectQuartz nanocrystal-
dc.subjectSubaerial volcanism-
dc.subjectRise of atmospheric-
dc.titleQuartz nanocrystals in the 2.48 Ga Dales Gorge banded iron formation of Hamersley, Western Australia: Evidence for a change from submarine to subaerial volcanism at the end of the Archeanen_US
dc.typeArticleen_US
dc.identifier.emailLi, YL: yiliang@hku.hken_US
dc.identifier.emailChan, LS: chanls@hku.hken_US
dc.identifier.authorityLi, Y=rp01354en_US
dc.identifier.authorityChan, LS=rp00665en_US
dc.identifier.doi10.2138/am.2013.4205-
dc.identifier.hkuros214221en_US
dc.identifier.hkuros240156-
dc.identifier.volume98en_US
dc.identifier.spage582en_US
dc.identifier.epage587en_US
dc.identifier.isiWOS:000317373200007-
dc.publisher.placeUnited States-

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