Chemical characteristics of iron meteorite parent bodies

Hilton, Connor D.; Ash, Richard D.; Walker, Richard J.

doi:10.1016/j.gca.2021.11.035

Chemical characteristics of iron meteorite parent bodies

Journal Article · 15 December 2021 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2021.11.035· OSTI ID:1837647

^[1]; Ash, Richard D. ^[1]; Walker, Richard J. ^[1]

Univ. of Maryland, College Park, MD (United States)

The projected relative abundances of the highly siderophile elements (HSE; Re, Os, Ir, Ru, Pt, and Pd) for bulk parent bodies of 10 magmatic iron meteorite groups/grouplet (IC, IIAB, IIC, IID, IIF, IIIAB, IIIF, IVA, IVB, and South Byron Trio) are broadly similar and show no resolvable differences between noncarbonaceous (NC) and carbonaceous (CC) genetic heritage. The processes driving genetic isotopic heterogeneity in the early Solar System, therefore, evidently did not leave discernable chemical fingerprints with respect to HSE relative abundances on the bulk planetesimal scale. By contrast, the absolute abundances of HSE projected for parent body cores, which reflect core size, are more variable and, on average, higher in CC bodies compared to NC bodies. Overall, bulk core chemical compositions, as well as core size, are linked to the distribution of Fe within a parent body, which is controlled by its oxidation state. The CC parent bodies are constrained to have formed under heterogeneous oxidizing conditions which were, on average, more oxidizing than those of the NC environment.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1837647

Report Number(s):: PNNL-SA-162199

Journal Information:: Geochimica et Cosmochimica Acta, Vol. 318; ISSN 0016-7037

Publisher:: Elsevier; The Geochemical Society; The Meteoritical Society

Country of Publication:: United States

Language:: English

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