Variable refractory lithophile element compositions of planetary building blocks: Insights from components of enstatite chondrites

Yoshizaki, Takashi; Ash, R. D.; Lipella, Marc D.; Yokoyama, T.; McDonough, William F.

doi:10.1016/j.gca.2021.05.057

Cited by 5 publications

(3 citation statements)

References 124 publications

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“…Münker et al (2017) experimentally showed that under highly reducing conditions, Nb is more chalcophile than Ta, and that sulfide liquids mobilize Nb and reduce the Nb/Ta ratios of residual materials. The same is true for Ti, since this element is mainly contained in troilite in ECs (Yoshizaki et al, 2021). However, ECs do not only contain Fe-sulfides.…”

Section: Implications For the Trace Element Abundances In Primitive M...mentioning

confidence: 77%

“…explains the Mn-depletion in enstatite (e.g., Rubin, 2008). Troilite can be rich in V (Yoshizaki et al, 2021) and it is not surprising that Ti and V concentrations are well correlated in residues. As for Ti, the residues obtained with the most metamorphosed chondrites display the lowest concentrations.…”

Section: Trace Element Abundances In Silicate Fractions and Redistrib...mentioning

confidence: 99%

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Trace element redistributions during metamorphism of E-chondrites: Implications for reduced bodies and the Earth

Barrat

Bischoff

Zanda

2023

Geochimica et Cosmochimica Acta

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Section: Implications For the Trace Element Abundances In Primitive M...mentioning

confidence: 77%

Section: Trace Element Abundances In Silicate Fractions and Redistrib...mentioning

confidence: 99%

Trace element redistributions during metamorphism of E-chondrites: Implications for reduced bodies and the Earth

Barrat

Bischoff

Zanda

2023

Geochimica et Cosmochimica Acta

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“…Sulfides (FeS, MgS and CaS) are an important reservoir for Mo (ref. 43 ) as well as other trace elements such as Zr and Nd in reduced chondrites 44 , 45 . Importantly, astronomical observations suggest that >90% of the sulfur budget in young disks is hosted in refractory sulfides, indicating that these minerals are ubiquitous in protoplanetary disks 46 .…”

Section: Planetary Accretion and Isotope Diversitymentioning

confidence: 99%

Silicon isotope constraints on terrestrial planet accretion

Onyett

Schiller

Makhatadze

et al. 2023

Nature

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Understanding the nature and origin of the precursor material to terrestrial planets is key to deciphering the mechanisms and timescales of planet formation1. Nucleosynthetic variability among rocky Solar System bodies can trace the composition of planetary building blocks2–5. Here we report the nucleosynthetic composition of silicon (μ30Si), the most abundant refractory planet-building element, in primitive and differentiated meteorites to identify terrestrial planet precursors. Inner Solar System differentiated bodies, including Mars, record μ30Si deficits of −11.0 ± 3.2 parts per million to −5.8 ± 3.0 parts per million whereas non-carbonaceous and carbonaceous chondrites show μ30Si excesses from 7.4 ± 4.3 parts per million to 32.8 ± 2.0 parts per million relative to Earth. This establishes that chondritic bodies are not planetary building blocks. Rather, material akin to early-formed differentiated asteroids must represent a major planetary constituent. The μ30Si values of asteroidal bodies correlate with their accretion ages, reflecting progressive admixing of a μ30Si-rich outer Solar System material to an initially μ30Si-poor inner disk. Mars’ formation before chondrite parent bodies is necessary to avoid incorporation of μ30Si-rich material. In contrast, Earth’s μ30Si composition necessitates admixing of 26 ± 9 per cent of μ30Si-rich outer Solar System material to its precursors. The μ30Si compositions of Mars and proto-Earth are consistent with their rapid formation by collisional growth and pebble accretion less than three million years after Solar System formation. Finally, Earth’s nucleosynthetic composition for s-process sensitive (molybdenum and zirconium) and siderophile (nickel) tracers are consistent with pebble accretion when volatility-driven processes during accretion and the Moon-forming impact are carefully evaluated.

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Deciphering Redox State for a Metal-Rich World

et al. 2022

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The Psyche mission’s Oxidation-Reduction Working Group is focused on understanding, determining, and applying the redox state of (16) Psyche to understand the origin of a metal-rich world. The oxidation-reduction state of an asteroid, along with its temperature, parent body size, and composition, is a key parameter in determining the history of an asteroid. Determining the redox state from spacecraft data is most easily done by examining potential metal-oxide buffer pairs. The occurrence of Ni, Fe, C, Cr, P and Si, in that order, in the metal or sulfide phase of an asteroidal body indicates increasingly reduced conditions. Key observations by the Imager and Gamma-Ray and Neutron Spectrometer (GRNS) of Psyche can bracket the redox state using metal-oxide buffers. The presence of Fe,Ni metal can be confirmed by the ratios of Fe/O or Fe/Si and the concentration of Ni variability in metal across the asteroid can be determined by GRNS. The FeO concentration of silicates is complementary to the Ni concentration of metal and can be constrained using filters on the Imager. The presence of FeO in silicates from ground-based observations is one of the few measurements we already have of redox state, although available data permit a wide range of silicate compositions and mineralogies. The presence of C, P or Si concentrated in the metallic, Fe-rich portion of the asteroid, as measured by GRNS, or Ca-sulfide, determined by imaging, would indicate increasingly reducing conditions. Linkage to known types of meteorites, whether metal-rich chondrites, stony-irons or irons, expands the mineralogical, chemical and isotopic data not available from remote observations alone. Redox also controls both silicate and metal mineralogy, influencing differentiation, solidification, and subsolidus cooling, including the relative abundance of sulfur in the core and possible magnetic signatures. The redox state of Psyche, if a fully-differentiated metallic core, might constrain the location and timing of both the formation of Psyche and any oxidation it might have experienced.

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Variable refractory lithophile element compositions of planetary building blocks: Insights from components of enstatite chondrites

Cited by 5 publications

References 124 publications

Trace element redistributions during metamorphism of E-chondrites: Implications for reduced bodies and the Earth

Trace element redistributions during metamorphism of E-chondrites: Implications for reduced bodies and the Earth

Silicon isotope constraints on terrestrial planet accretion

Deciphering Redox State for a Metal-Rich World

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