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Confirmation of mass-independent Ni isotopic variability in iron meteorites

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Confirmation of mass-independent Ni isotopic variability in iron meteorites. / Steele, Robert Charles John; Elliott, Tim; Coath, Christopher D.; Regelous, Marcel .

In: Geochimica et Cosmochimica Acta, Vol. 75, No. 24, 15.12.2011, p. 7906-7925.

Research output: Contribution to journalArticlepeer-review

Harvard

Steele, RCJ, Elliott, T, Coath, CD & Regelous, M 2011, 'Confirmation of mass-independent Ni isotopic variability in iron meteorites', Geochimica et Cosmochimica Acta, vol. 75, no. 24, pp. 7906-7925. https://doi.org/10.1016/j.gca.2011.08.030

APA

Steele, R. C. J., Elliott, T., Coath, C. D., & Regelous, M. (2011). Confirmation of mass-independent Ni isotopic variability in iron meteorites. Geochimica et Cosmochimica Acta, 75(24), 7906-7925. https://doi.org/10.1016/j.gca.2011.08.030

Vancouver

Steele RCJ, Elliott T, Coath CD, Regelous M. Confirmation of mass-independent Ni isotopic variability in iron meteorites. Geochimica et Cosmochimica Acta. 2011 Dec 15;75(24):7906-7925. https://doi.org/10.1016/j.gca.2011.08.030

Author

Steele, Robert Charles John ; Elliott, Tim ; Coath, Christopher D. ; Regelous, Marcel . / Confirmation of mass-independent Ni isotopic variability in iron meteorites. In: Geochimica et Cosmochimica Acta. 2011 ; Vol. 75, No. 24. pp. 7906-7925.

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@article{bb20d9ad15624eb486414e9b13ea4ab7,
title = "Confirmation of mass-independent Ni isotopic variability in iron meteorites",
abstract = "We report high-precision analyses of internally-normalised Ni isotope ratios in 12 bulk iron meteorites. Our measurements of 60Ni/61Ni, 62Ni/61Ni and 64Ni/61Ni normalised to 58Ni/61Ni and expressed in parts per ten thousand (‱) relative to NIST SRM 986 as ε60Ni586, ε62Ni5861 and ε64Ni5861 vary by 0.146, 0.228 and 0.687, respectively. The precision on a typical analysis is 0.03, 0.05nd 0.08‱ for ε60Ni5861,  ε62Ni5861 and ε64Ni5861, respectively, which is comparable to our sample reproducibility. We show that this {\textquoteleft}mass-independent{\textquoteright} Ni isotope variability cannot be ascribed to interferences, inaccurate correction of instrumental or natural mass-dependent fractionation, fractionation controlled by nuclear field shift effects, nor the influence of cosmic ray spallation. These results thus document the presence of mass-independent Ni isotopic heterogeneity in bulk meteoritic samples, as previously proposed by Regelous et al. (2008) (EPSL 272, 330–338), but our new analyses are more precise and include determination of 64Ni. Intriguingly, we find that terrestrial materials do not yield homogenous internally-normalised Ni isotope compositions, which, as pointed out by Young et al. (2002) (GCA 66, 1095–1104), may be the expected result of using the exponential (kinetic) law and atomic masses to normalise all fractionation processes. The certified Ni isotope reference material NIST SRM 986 defines zero in this study, while appropriate ratios for the bulk silicate Earth are given by the peridotites JP-1 and DTS-2 and, relative to NIST SRM 986, yield deviations in ε60Ni5861, ε62Ni5861 and ε64Ni5861 of −0.006, 0.036 and 0.119‱, respectively. There is a strong positive correlation between ε64Ni5861 and ε62Ni5861in iron meteorites analyses, with a slope of 3.03 ± 0.71. The variations of Ni isotope anomalies in iron meteorites are consistent with heterogeneous distribution of a nucleosynthetic component from a type Ia supernova into the proto-solar nebula.",
keywords = "Nickel, Technique, Mass-independent, Isotope, Iron meteorite, Early Solar System",
author = "Steele, {Robert Charles John} and Tim Elliott and Coath, {Christopher D.} and Marcel Regelous",
note = "Funding: NERC (NE/F007329/1), STFC (ST/F002734/1) and NHM.",
year = "2011",
month = dec,
day = "15",
doi = "10.1016/j.gca.2011.08.030",
language = "English",
volume = "75",
pages = "7906--7925",
journal = "Geochimica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Elsevier",
number = "24",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Confirmation of mass-independent Ni isotopic variability in iron meteorites

AU - Steele, Robert Charles John

AU - Elliott, Tim

AU - Coath, Christopher D.

AU - Regelous, Marcel

N1 - Funding: NERC (NE/F007329/1), STFC (ST/F002734/1) and NHM.

PY - 2011/12/15

Y1 - 2011/12/15

N2 - We report high-precision analyses of internally-normalised Ni isotope ratios in 12 bulk iron meteorites. Our measurements of 60Ni/61Ni, 62Ni/61Ni and 64Ni/61Ni normalised to 58Ni/61Ni and expressed in parts per ten thousand (‱) relative to NIST SRM 986 as ε60Ni586, ε62Ni5861 and ε64Ni5861 vary by 0.146, 0.228 and 0.687, respectively. The precision on a typical analysis is 0.03, 0.05nd 0.08‱ for ε60Ni5861,  ε62Ni5861 and ε64Ni5861, respectively, which is comparable to our sample reproducibility. We show that this ‘mass-independent’ Ni isotope variability cannot be ascribed to interferences, inaccurate correction of instrumental or natural mass-dependent fractionation, fractionation controlled by nuclear field shift effects, nor the influence of cosmic ray spallation. These results thus document the presence of mass-independent Ni isotopic heterogeneity in bulk meteoritic samples, as previously proposed by Regelous et al. (2008) (EPSL 272, 330–338), but our new analyses are more precise and include determination of 64Ni. Intriguingly, we find that terrestrial materials do not yield homogenous internally-normalised Ni isotope compositions, which, as pointed out by Young et al. (2002) (GCA 66, 1095–1104), may be the expected result of using the exponential (kinetic) law and atomic masses to normalise all fractionation processes. The certified Ni isotope reference material NIST SRM 986 defines zero in this study, while appropriate ratios for the bulk silicate Earth are given by the peridotites JP-1 and DTS-2 and, relative to NIST SRM 986, yield deviations in ε60Ni5861, ε62Ni5861 and ε64Ni5861 of −0.006, 0.036 and 0.119‱, respectively. There is a strong positive correlation between ε64Ni5861 and ε62Ni5861in iron meteorites analyses, with a slope of 3.03 ± 0.71. The variations of Ni isotope anomalies in iron meteorites are consistent with heterogeneous distribution of a nucleosynthetic component from a type Ia supernova into the proto-solar nebula.

AB - We report high-precision analyses of internally-normalised Ni isotope ratios in 12 bulk iron meteorites. Our measurements of 60Ni/61Ni, 62Ni/61Ni and 64Ni/61Ni normalised to 58Ni/61Ni and expressed in parts per ten thousand (‱) relative to NIST SRM 986 as ε60Ni586, ε62Ni5861 and ε64Ni5861 vary by 0.146, 0.228 and 0.687, respectively. The precision on a typical analysis is 0.03, 0.05nd 0.08‱ for ε60Ni5861,  ε62Ni5861 and ε64Ni5861, respectively, which is comparable to our sample reproducibility. We show that this ‘mass-independent’ Ni isotope variability cannot be ascribed to interferences, inaccurate correction of instrumental or natural mass-dependent fractionation, fractionation controlled by nuclear field shift effects, nor the influence of cosmic ray spallation. These results thus document the presence of mass-independent Ni isotopic heterogeneity in bulk meteoritic samples, as previously proposed by Regelous et al. (2008) (EPSL 272, 330–338), but our new analyses are more precise and include determination of 64Ni. Intriguingly, we find that terrestrial materials do not yield homogenous internally-normalised Ni isotope compositions, which, as pointed out by Young et al. (2002) (GCA 66, 1095–1104), may be the expected result of using the exponential (kinetic) law and atomic masses to normalise all fractionation processes. The certified Ni isotope reference material NIST SRM 986 defines zero in this study, while appropriate ratios for the bulk silicate Earth are given by the peridotites JP-1 and DTS-2 and, relative to NIST SRM 986, yield deviations in ε60Ni5861, ε62Ni5861 and ε64Ni5861 of −0.006, 0.036 and 0.119‱, respectively. There is a strong positive correlation between ε64Ni5861 and ε62Ni5861in iron meteorites analyses, with a slope of 3.03 ± 0.71. The variations of Ni isotope anomalies in iron meteorites are consistent with heterogeneous distribution of a nucleosynthetic component from a type Ia supernova into the proto-solar nebula.

KW - Nickel

KW - Technique

KW - Mass-independent

KW - Isotope

KW - Iron meteorite

KW - Early Solar System

U2 - 10.1016/j.gca.2011.08.030

DO - 10.1016/j.gca.2011.08.030

M3 - Article

VL - 75

SP - 7906

EP - 7925

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

IS - 24

ER -

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