Mass-independent Oxygen Isotopic Partitioning During Gas-phase SiO2 Formation
Affiliations
Meteorites contain a wide range of oxygen isotopic compositions that are interpreted as heterogeneity in solar nebula. The anomalous oxygen isotopic compositions of refractory mineral phases may reflect a chemical fractionation process in the nebula, but there are no experiments to demonstrate this isotope effect during particle formation through gas-phase reactions. We report experimental results of gas-to-particle conversion during oxidation of silicon monoxide that define a mass-independent line (slope one) in oxygen three-isotope space of (18)O/(16)O versus (17)O/(16)O. This mass-independent chemical reaction is a potentially initiating step in nebular meteorite formation, which would be capable of producing silicate reservoirs with anomalous oxygen isotopic compositions.
Mechanisms and Thermochemistry of Reactions of SiO and SiO with OH and HO.
Andersson S J Phys Chem A. 2023; 127(18):4015-4026.
PMID: 37129861 PMC: 10184121. DOI: 10.1021/acs.jpca.3c00862.
A mineral-based origin of Earth's initial hydrogen peroxide and molecular oxygen.
He H, Wu X, Zhu J, Lin M, Lv Y, Xian H Proc Natl Acad Sci U S A. 2023; 120(13):e2221984120.
PMID: 36940327 PMC: 10068795. DOI: 10.1073/pnas.2221984120.
Robert F, Chaussidon M, Gonzalez-Cano A, Mostefaoui S Proc Natl Acad Sci U S A. 2021; 118(52).
PMID: 34949641 PMC: 8719873. DOI: 10.1073/pnas.2114221118.
Tartese R, Chaussidon M, Gurenko A, Delarue F, Robert F Proc Natl Acad Sci U S A. 2018; 115(34):8535-8540.
PMID: 30082400 PMC: 6112742. DOI: 10.1073/pnas.1808101115.
A light carbon isotope composition for the Sun.
Lyons J, Gharib-Nezhad E, Ayres T Nat Commun. 2018; 9(1):908.
PMID: 29500355 PMC: 5834507. DOI: 10.1038/s41467-018-03093-3.