Silicon isotope constraints on terrestrial planet accretion

Onyett, Isaac J.; Schiller, Martin; Makhatadze, Georgy V.; Deng, Zhengbin; Johansen, Anders; Bizzarro, Martin

doi:10.1038/s41586-023-06135-z

Cited by 21 publications

(3 citation statements)

References 96 publications

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“…Based on Fe isotopes, Hopp et al (2022) recently suggested that Ryugu and the parent body of CI chondrites formed beyond the accretion of most carbonaceous chondrite parent bodies. However, CR and CI chondrites (and/or Ryugu) define nucleosynthetic compositional endmembers among carbonaceous chondrite groups in Si, Fe, and Mg (Schiller et al 2020;Hopp et al 2022;Onyett et al 2023). Although this does not preclude that CR, CI, and Ryugu all accreted in the outermost disk, it is difficult to reconcile with the observation that other carbonaceous chondrites record nucleosynthetic compositions intermediated between the CR and CI chondrites (and/or Ryugu) endmembers.…”

Section: Kinship With the CI Parent Asteroid And The Accretion Region...mentioning

confidence: 98%

“…Although our analysis does not allow us to distinguish between 26 Al or Mg isotope heterogeneity to account for the range of μ 26 Mg * composition across chondrite groups and, in particular, Ryugu's μ 26 Mg * excess relative to CIs, future measurements of Ryugu samples may provide insights into this question. Silicon has been recently developed as a novel nucleosynthetic tracer to probe genetic relationships between solar system solids, asteroids, and planetary bodies (Onyett et al 2023). Carbonaceous chondrites record μ 30 Si variability that corresponds to about 23 ppm, with CR and CI chondrite groups defining compositional endmembers.…”

Section: Excess 26 Mg * In Ryugumentioning

confidence: 99%

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The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

Bizzarro,

Schiller,

Yokoyama

et al. 2023

ApJL

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The nucleosynthetic isotope composition of planetary materials provides a record of the heterogeneous distribution of stardust within the early solar system. In 2020 December, the Japan Aerospace Exploration Agency Hayabusa2 spacecraft returned to Earth the first samples of a primitive asteroid, namely, the Cb-type asteroid Ryugu. This provides a unique opportunity to explore the kinship between primitive asteroids and carbonaceous chondrites. We report high-precision μ 26Mg* and μ 25Mg values of Ryugu samples together with those of CI, CM, CV, and ungrouped carbonaceous chondrites. The stable Mg isotope composition of Ryugu aliquots defines μ 25Mg values ranging from –160 ± 20 ppm to –272 ± 30 ppm, which extends to lighter compositions relative to Ivuna-type (CI) and other carbonaceous chondrite groups. We interpret the μ 25Mg variability as reflecting heterogeneous sampling of a carbonate phase hosting isotopically light Mg (μ 25Mg ∼ –1400 ppm) formed by low temperature equilibrium processes. After correcting for this effect, Ryugu samples return homogeneous μ 26Mg* values corresponding to a weighted mean of 7.1 ± 0.8 ppm. Thus, Ryugu defines a μ 26Mg* excess relative to the CI and CR chondrite reservoirs corresponding to 3.8 ± 1.1 and 11.9 ± 0.8 ppm, respectively. These variations cannot be accounted for by in situ decay of 26Al given their respective 27Al/24Mg ratios. Instead, it requires that Ryugu and the CI and CR parent bodies formed from material with a different initial 26Al/27Al ratio or that they are sourced from material with distinct Mg isotope compositions. Thus, our new Mg isotope data challenge the notion that Ryugu and CI chondrites share a common nucleosynthetic heritage.

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Section: Kinship With the CI Parent Asteroid And The Accretion Region...mentioning

confidence: 98%

Section: Excess 26 Mg * In Ryugumentioning

confidence: 99%

The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

Bizzarro,

Schiller,

Yokoyama

et al. 2023

ApJL

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“…This was taken as instant zero of the age of the solar system. What followed was a complicated series of violent events [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

From the Nascent Earth to Ante-Cells Molecular Structures?

2024

J Biomed Res Environ Sci

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During its early youth, the Earth was the site of extremely violent processes. In particular, the energy of the impact of the planet Theia with the young Earth was such that the latter became entirely covered with a thick layer of molten magma, called the "magma ocean". On the now calmed Earth that we currently know, the objects classified as "living" by our sense organs are distinguished from those classified as "non-living" by two main characteristics: i) living objects have a completely original organic molecular constitution and ii) in contrast to non-living objects, which tend to equilibrate with the outside, living objects never reach equilibrium and are therefore "obligatory dynamical systems" out of equilibrium. It seems that the dynamic characteristic was acquired before the molecular characteristic for the genesis on Earth of the first living object(s). We propose that hypothetical "ante-cells" reached a "dynamic although inorganic" state on the nascent Earth, and then, that these ante-cells gradually transformed into real cells once the Earth had cooled sufficiently for organic molecules to appear there. The vestigial pentameric RNAs would mark this key moment when the ante-cells have begun to join the organic world.

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Is There a Genetic Relationship Between Chondrules and Matrix?

van Kooten,

Brearley,

Ebel

et al. 2024

Space Sci Rev

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Chondritic components such as chondrules and matrix are the key time capsules that can help us understand the evolution and dynamics of the protoplanetary disk from which the Solar System originated. Knowledge of where and how these components formed and to what extent they were transported in the gaseous disk provides major constraints to astrophysical models that investigate planet formation. Here, we explore whether chondrules and matrix are genetically related to each other and formed from single reservoirs per chondrite group or if every chondrite represents a unique proportion of components transported from a small number of formation reservoirs in the disk. These ‘static versus dynamic disk’ interpretations of cosmochemical data have profound implications for the accretion history of the planets in the Solar System. To fully understand the relationship between chondrules and matrix and their potential “complementarity”, we dive into the petrological nature and origin of matrix, the chemical and isotopic compositions of chondrules and matrix and evaluate these data considering the effect of secondary alteration observed in chondrites and the potential complexity of chondrule formation. Even though we, the authors, have used different datasets and arrived at differing interpretations of chondrule-matrix relationships in the past, this review provides clarity on the existing data and has given us new directions towards future research that can resolve the complementarity debate.

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Silicon isotope constraints on terrestrial planet accretion

Cited by 21 publications

References 96 publications

The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

From the Nascent Earth to Ante-Cells Molecular Structures?

Is There a Genetic Relationship Between Chondrules and Matrix?

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