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dc.contributor.author
Bridgestock, Luke J.
dc.contributor.author
Williams, Helen
dc.contributor.author
Rehkämper, Mark
dc.contributor.author
Larner, Fiona
dc.contributor.author
Giscard, Marlène D.
dc.contributor.author
Hammond, Samantha
dc.contributor.author
Coles, Barry
dc.contributor.author
Andreasen, Rasmus
dc.contributor.author
Wood, Bernard J.
dc.contributor.author
Theis, Karen J.
dc.contributor.author
Smith, Caroline L.
dc.contributor.author
Benedix, Gretchen K.
dc.contributor.author
Schönbächler, Maria
dc.date.accessioned
2019-12-06T11:12:54Z
dc.date.available
2017-06-11T09:16:31Z
dc.date.available
2019-12-06T11:12:54Z
dc.date.issued
2014-08-15
dc.identifier.other
10.1016/j.epsl.2014.05.029
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/84920
dc.description.abstract
Zinc isotope compositions (δ^66Zn) and concentrations were determined for metal samples of 15 iron meteorites across groups IAB, IIAB, and IIIAB. Also analyzed were troilite and other inclusions from the IAB iron Toluca. Furthermore, the first Zn isotope data are presented for metal-silicate partitioning experiments that were conducted at 1.5 GPa and 1650 K. Three partitioning experiments with run durations of between 10 and 60 min provide consistent Zn metal-silicate partition coefficients of ~0.7 and indicate that Zn isotope fractionation between molten metal and silicate is either small (at less than about ±0.2‰) or absent. Metals from the different iron meteorite groups display distinct ranges in Zn contents, with concentrations of 0.08-0.24 μg/g for IIABs, 0.8-2.5 μg/g for IIIABs, and 12-40 μg/g for IABs. In contrast, all three groups show a similar range of δ^66Zn values (reported relative to 'JMC Lyon Zn') from +0.5‰ to +3.0‰, with no clear systematic differences between groups. However, distinct linear trends are defined by samples from each group in plots of δ^66Zn vs. 1/Zn, and these correlations are supported by literature data. Based on the high Zn concentration and δ^66Zn ≈ 0 determined for a chromite-rich inclusion of Toluca, modeling is employed to demonstrate that the Zn trends are best explained by segregation of chromite from the metal phase. This process can account for the observed Zn-δ^66Zn-Cr systematics of iron meteorite metals, if Zn is highly compatible in chromite and Zn partitioning is accompanied by isotope fractionation with δ^66Znchr-met ≈ - 1.5‰. Based on these findings, it is likely that the parent bodies of the IAB complex, IIAB and IIIAB iron meteorites featured δ^66Zn values of about -1.0 to +0.5‰, similar to the Zn isotope composition inferred for the bulk silicate Earth and results obtained for chondritic meteorites. Together, this implies that most solar system bodies formed with similar bulk Zn isotope compositions despite large differences in Zn contents.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.subject
Iron meteorites
en_US
dc.subject
Stable isotopes
en_US
dc.subject
Zn isotopes
en_US
dc.subject
Volatile elements
en_US
dc.subject
Core formation
en_US
dc.title
Unlocking the zinc isotope systematics of iron meteorites
en_US
dc.type
Journal Article
dc.date.published
2014-06-06
ethz.journal.title
Earth and Planetary Science Letters
ethz.journal.volume
400
en_US
ethz.pages.start
153
en_US
ethz.pages.end
164
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03946 - Schönbächler, Maria / Schönbächler, Maria
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03946 - Schönbächler, Maria / Schönbächler, Maria
ethz.date.deposited
2017-06-11T09:16:57Z
ethz.source
ECIT
ethz.identifier.importid
imp593651f65fb3e85679
ethz.ecitpid
pub:133874
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2017-07-13T12:23:06Z
ethz.rosetta.lastUpdated
2018-11-02T14:49:32Z
ethz.rosetta.versionExported
true
ethz.COinS
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