J/ApJ/758/59ivo://CDS.VizieR/J/ApJ/758/59doi:10.26093/cds/vizier.17580059CDSSteele R.C.J.Coath C.D.Regelous M.Russell S.Elliott T.2014-08-27T13:32:40Z2014-08-07T10:07:59ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frchemical-abundancessolar-systemWe present new, mass-independent, Ni isotope data for a range of bulk chondritic meteorites. The data are reported as {epsilon}g^60^Ni_58/61_, {x3b5}^62^Ni_58/61_, and {epsilon}g^64^Ni_58/61_, or the parts per ten thousand deviations from a terrestrial reference, the NIST SRM 986 standard, of the ^58^Ni/^61^Ni internally normalized ^60^Ni/^61^Ni, ^62^Ni/^61^Ni, and ^64^Ni/^61^Ni ratios. The chondrites show a range of 0.15, 0.29, and 0.84 in {epsilon}g^60^Ni_58/61_, {x3b5}^62^Ni_58/61_, and {epsilon}g^64^Ni_58/61_ relative to a typical sample precision of 0.03, 0.05, and 0.08 (2 s.e.), respectively. The carbonaceous chondrites show the largest positive anomalies, enstatite chondrites have approximately terrestrial ratios, though only EH match Earth's composition within uncertainty, and ordinary chondrites show negative anomalies. The meteorite data show a strong positive correlation between {epsilon}g^62^Ni_58/61_ and {x3b5}^64^Ni_58/61_, an extrapolation of which is within the error of the average of previous measurements of calcium-, aluminium-rich inclusions. Moreover, the slope of this bulk meteorite array is 3.003+/-0.166 which is within the error of that expected for an anomaly solely on ^58^Ni. We also determined to high precision (~10 ppm per AMU) the mass-dependent fractionation of two meteorite samples which span the range of {epsilon}g^62^Ni_58/61_ and {x3b5}^64^Ni_58/61_. These analyses show that "absolute" ratios of ^58^Ni/^61^Ni vary between these two samples whereas those of ^62^Ni/^61^Ni and ^64^Ni/^61^Ni do not. Thus, Ni isotopic differences seem most likely explained by variability in the neutron-poor ^58^Ni, and not correlated anomalies in the neutron-rich isotopes, ^62^Ni and ^64^Ni. This contrasts with previous inferences from mass-independent measurements of Ni and other transition elements which invoked variable contributions of a neutron-rich component. We have examined different nucleosynthetic environments to determine the possible source of the anomalous material responsible for the isotopic variations observed in Ni and other transition elements within bulk samples.2012ApJ...758...59Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/758/59CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/758/45 : Isotopic Sr abundances in meteorites (Moynier+, 2012)J/ApJS/156/105 : Transitions in L-shell ions of Fe and Ni (Gu+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/758/59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/758/59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/758/59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/758/59https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/758/59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/758/59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/758/59/table1Mass-dependent and mass-independent Ni isotope data, reported relative to NIST SRM 986, for chondrites and terrestrial materialsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetGroup of materialssrc.classcharNameSample namemeta.id;src.samplecharf_Name[+rs*] Origin of sample (1)meta.codecharClassChemical groupsrc.classcharNHMNatural History Museum numbermeta.idcharNaNumber of analyses for this samplemeta.numberintn62[4/72]? Number of analyses for 62Ni (2)meta.numberintnullablen64[4/50]? Number of analyses for 64Ni (2)meta.numberintnullablee60Ni[-0.2/0.01] {epsilon}^60^Ni_58/61_ (3)phys.abundfloate_e60Ni[0.006/0.04] e60Ni 2-{sigma} errorstat.errorfloate62Ni[-0.2/0.3] {epsilon}^62^Ni_58/61_ (3)phys.abundfloate_e62Ni[0.01/0.07] e62Ni 2-{sigma} errorstat.errorfloate64Ni[-0.4/0.6] {epsilon}^64^Ni_58/61_ (3)phys.abundfloate_e64Ni[0.02/0.2] e64Ni 2-{sigma} errorstat.errorfloat60/58Ni[-0.7/0.4]? {delta}^60/58^Niphys.abundfloatnullablef_60/58Ni[a] Flag on 60/58Ni (4)meta.codechare_60/58Ni[0.02/0.1]? 60/58Ni 2-{sigma} standard errorstat.errorfloatnullableSampAbbreviated name in Sample column in table 3 (Column added by CDS)meta.idcharJ/ApJ/758/59/table3Analyses for which all five isotopes were measuredrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampleSample name and number (separated by underscore=meta.id;meta.mainchare62Ni[-0.2/0.3] Part per ten thousand difference in the ^62^Ni/^61^Ni ratio (1)phys.abundfloate_e62Ni[0.042] One standard deviation of e62Ni (2)stat.errorfloate64Ni[-0.5/0.7] Part per ten thousand difference in the ^64^Ni/^61^Ni ratio (1)phys.abundfloate_e64Ni[0.082] One standard deviation of e64Ni (2)stat.errorfloat