High-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zircon

Title:
High-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zircon
Authors:
Page, F. Zeb ( 0000-0002-2100-0806 ) ; Ushikubo, T.; Kita, Noriko T.; Riciputi, L. R.; Valley, John W.
Abstract:
Ion microprobe analysis with a sub-micrometer diameter spot reveals a sharp, 2 μm gradient in oxygen isotope ratio proving that oxygen diffusion in zircon is slow even under prolonged high-grade metamorphism. The data are consistent with an oxygen diffusion coefficient of 10−23.5±1 cm2/s. Furthermore, this gradient is found in a zircon that contains clear textural evidence of recrystallization in nearby regions. This finding shows that through careful textural and chemical analysis, primary information can be extracted from a zircon that has also undergone partial recrystallization. The oxygen isotope ratios found in zircon have been used to infer magmatic and pre-magmatic histories, including the presence of liquid water on the surface of earliest Earth. Recently, these interpretations have been questioned with the assertion that zircon may not retain its primary oxygen isotope signature through metamorphism. The slow diffusion confirmed by these results supports interpretations that assume preservation of magmatic compositions.
Citation:
Page, F. Z., T. Ushikubo, N. T. Kita, L. R. Riciputi, et al. 2007. "High-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zircon." American Mineralogist 92: 1772-1775.
Publisher:
Mineralogical Society of America
DATE ISSUED:
2007
Department:
Geology
Type:
article
PUBLISHED VERSION:
10.2138/am.2007.2697
PERMANENT LINK:
http://hdl.handle.net/11282/310383

Full metadata record

DC FieldValue Language
dc.contributor.authorPage, F. Zeben_US
dc.contributor.authorUshikubo, T.en_US
dc.contributor.authorKita, Noriko T.en_US
dc.contributor.authorRiciputi, L. R.en_US
dc.contributor.authorValley, John W.en_US
dc.date.accessioned2013-12-23T16:31:53Zen
dc.date.available2013-12-23T16:31:53Zen
dc.date.issued2007en
dc.identifier.citationPage, F. Z., T. Ushikubo, N. T. Kita, L. R. Riciputi, et al. 2007. "High-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zircon." American Mineralogist 92: 1772-1775.en_US
dc.identifier.issn0003-004Xen_US
dc.identifier.urihttp://hdl.handle.net/11282/310383en
dc.description.abstractIon microprobe analysis with a sub-micrometer diameter spot reveals a sharp, 2 μm gradient in oxygen isotope ratio proving that oxygen diffusion in zircon is slow even under prolonged high-grade metamorphism. The data are consistent with an oxygen diffusion coefficient of 10−23.5±1 cm2/s. Furthermore, this gradient is found in a zircon that contains clear textural evidence of recrystallization in nearby regions. This finding shows that through careful textural and chemical analysis, primary information can be extracted from a zircon that has also undergone partial recrystallization. The oxygen isotope ratios found in zircon have been used to infer magmatic and pre-magmatic histories, including the presence of liquid water on the surface of earliest Earth. Recently, these interpretations have been questioned with the assertion that zircon may not retain its primary oxygen isotope signature through metamorphism. The slow diffusion confirmed by these results supports interpretations that assume preservation of magmatic compositions.en_US
dc.publisherMineralogical Society of Americaen_US
dc.identifier.doi10.2138/am.2007.2697en
dc.subject.departmentGeologyen_US
dc.titleHigh-precision oxygen isotope analysis of picogram samples reveals 2 μm gradients and slow diffusion in zirconen_US
dc.typearticleen_US
dc.identifier.journalAmerican Mineralogisten_US
dc.subject.keywordIon microprobeen_US
dc.subject.keywordSIMSen_US
dc.subject.keywordZirconen_US
dc.subject.keywordDiffusionen_US
dc.subject.keywordOxygen isotopesen_US
dc.subject.keywordStable isotopesen_US
dc.subject.keywordGranulites faciesen_US
dc.subject.keywordMigmatitesen_US
dc.identifier.volume92en_US
dc.identifier.startpage1772en_US
All Items in The Five Colleges of Ohio Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.