Fluid-assisted metasomatic processes on planetary bodies: Evidence from vestan lithologies

Shisseh, Taha; Aoudjehane, H. Chennaoui; Barrat, Jean‐Alix; Zanda, B.; Hewins, R. H.; Agee, C. B.; Folco, Luigi; Jacquet, Emmanuel; Pont, Sylvain

doi:10.1016/j.gca.2022.11.007

Cited by 2 publications

(2 citation statements)

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“…The anomalous eucrites, that is, Pasamonte and Ibitira, should have similar metal isotope compositions as normal eucrites (Trinquier et al., 2009). However, their different mass‐independent 17 O/ 16 O (Mittlefehldt, 2015; Scott et al., 2009) could be evidence that these anomalous eucrites come from the Vestoids, that is, smaller asteroids around Vesta (Burbine et al., 2001), and experienced some secondary alteration (e.g., fluid‐assisted metasomatic processes) that changed their O isotope compositions (Shisseh et al., 2023) but not their metal isotope compositions.…”

Section: Discussionmentioning

confidence: 99%

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Calcium Isotope Evolution During Differentiation of Vesta and Calcium Isotopic Heterogeneities in the Inner Solar System

Zhu

Hui

Klaver

et al. 2023

Geophysical Research Letters

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We employed MC‐ICP‐MS to measure the mass‐dependent Ca isotope compositions of Vesta‐related meteorites. Eucrites and diogenites show distinct Ca isotope compositions, which is caused by crystallization of isotopically heavy orthopyroxene. The Ca isotope data support a model where the two lithologies are linked, where the diogenites, mainly composed of orthopyroxene crystallized from an eucritic melt. As normal eucrites are the main Ca reservoir on Vesta, their δ44/40Ca values (per mil 44Ca/40Ca ratios relative to NIST 915a) best represents that of bulk silicate Vesta (0.83 ± 0.04‰). This value is different from those of bulk Earth (0.94 ± 0.05‰) and Mars (1.04 ± 0.07‰), suggesting that there exists notable Ca isotope heterogeneity between inner solar system bodies. The δ44/40Ca difference between chondrules and these planets does not support the pebble accretion model as the main mechanism for planetary growth.

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Section: Discussionmentioning

confidence: 99%

“…come from the Vestoids, that is, smaller asteroids around Vesta (Burbine et al, 2001), and experienced some secondary alteration (e.g., fluid-assisted metasomatic processes) that changed their O isotope compositions (Shisseh et al, 2023) but not their metal isotope compositions.…”

Section: Genetic Relationships Between Heds and Mesosideritesmentioning

confidence: 99%