Genetics, age and crystallization history of group IIC iron meteorites

Tornabene, Hope; Hilton, Connor D.; Bermingham, K. R.; Ash, R. D.; Walker, Richard J.

doi:10.1016/j.gca.2020.07.036

Cited by 25 publications

(37 citation statements)

References 49 publications

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“…The HSE parental melt compositions constrained using M1 and M2 fall between estimated bulk core compositions of the IIC, IVA, and SBT iron meteorites (Fig. 6), whereas the HSE parental melt composition resulting from M3 is similar to that of the IVA iron meteorites (Walker et al 2008;McCoy et al 2011;Hilton et al 2019;Tornabene et al 2020). The HSE parental melt compositions of M1, M2, and M3 are enriched compared to the average HSE abundances of carbonaceous chondrites by factors of 4-10.…”

Section: Fractional Crystallization Modelingmentioning

confidence: 74%

“…2019), and IIC iron meteorites (Tornabene et al. 2020). The average HSE composition of carbonaceous chondrites is also shown (Horan et al.…”

Section: Discussionmentioning

confidence: 99%

“…2019; Tornabene et al. 2020). The HSE parental melt compositions of M1, M2, and M3 are enriched compared to the average HSE abundances of carbonaceous chondrites by factors of 4–10.…”

Section: Discussionmentioning

confidence: 99%

“…6. Calculated HSE parental melt compositions, normalized to CI chondrites (Horan et al 2003), of the IIF M1, M2, and M3 as well as the PES M1 compared to parental melt compositions of the IVB (Walker et al 2008), IVA (McCoy et al 2011, SBT (Hilton et al 2019), and IIC iron meteorites (Tornabene et al 2020). The average HSE composition of carbonaceous chondrites is also shown (Horan et al 2003;Fischer-G€ odde et al 2010).…”

Section: Fractional Crystallization Modelingmentioning

confidence: 97%

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Crystallization histories of the group IIF iron meteorites and Eagle Station pallasites

Hilton

Ash

Walker

2020

Meteorit & Planetary Scien

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The group IIF iron meteorites and Eagle Station pallasites (PES) have highly siderophile element abundances (HSE; Re, Os, Ir, Ru, Pt, and Pd) of metal that are consistent with formation in planetesimal cores by fractional crystallization with minor to major solid metal-liquid metal mixing. Modeling of HSE abundances of the IIF irons indicates a complex formation history that included the mixing of primitive and evolved solid and liquid metals. By contrast, modeling of HSE abundances of PES metal suggests these meteorites formed mainly as equilibrium solids from a common liquid. Abundances of some of the siderophile elements in the IIF irons and PES are permissive of a common core origin; however, the abundances of W and Ni indicate the PES ultimately formed on a more oxidized body. The PES most likely formed by the injection of olivine present at the core-mantle boundary into a metallic core liquid as a result of impact. The core then crystallized inward, trapping the olivine.

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Section: Fractional Crystallization Modelingmentioning

confidence: 74%

“…2019), and IIC iron meteorites (Tornabene et al. 2020). The average HSE composition of carbonaceous chondrites is also shown (Horan et al.…”

Section: Discussionmentioning

confidence: 99%

“…2019; Tornabene et al. 2020). The HSE parental melt compositions of M1, M2, and M3 are enriched compared to the average HSE abundances of carbonaceous chondrites by factors of 4–10.…”

Section: Discussionmentioning

confidence: 99%

Section: Fractional Crystallization Modelingmentioning

confidence: 97%

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Crystallization histories of the group IIF iron meteorites and Eagle Station pallasites

Hilton

Ash

Walker

2020

Meteorit & Planetary Scien

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“…2017; Tornabene et al. 2020). Extreme Mo isotope compositions of IIC group (i.e., ε 92 Mo = +3.12 ± 0.27; Poole et al.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the O‐Cr‐Mo isotope signatures in various meteorites representing core–mantle–crust fragments: Implications for partially differentiated planetesimal(s) accreted in the early outer solar system

Ali

Jabeen

2021

Meteorit & Planetary Scien

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The Allende, Eagle Station pallasites (ESP), some ungrouped achondrites (UA), and ungrouped irons (UI) represent different types of meteorites; these are traditionally distinguished as chondrule‐bearing chondrite, chondrule‐free stony irons, stones, and irons, respectively. Oxygen isotopic compositions of meteorites have long been used as a robust tool to identify the parent bodies of these extraterrestrial materials. We revisited the δ18O‐∆17O, along with ε54Cr and ε92Mo, of these meteorites and established a genetic link that possibly suggests that undifferentiated carbonaceous chondrites and their differentiated counterparts belong to a common reservoir. We observed that the differentiated counterparts of Allende CV3 including ESP, ungrouped achondrites, and ungrouped irons collectively provide the oxygen isotope trends comparable to those of the Y&R and the PCM lines, and are likely to represent the primitive isotope reservoirs in the solar nebula. ε54Cr and ε92Mo data of these meteorite types support their oxygen isotope trends. The idea of a common partially differentiated parent body also lends support from natural remnant magnetization in the CV chondrites and Eagle Station olivine. Furthermore, ∆17O‐ε54Cr data suggest that these meteorites originated from carbonaceous planetesimal(s) accreted at different heliocentric distances in the solar nebula in the outer solar system. As proposed earlier, these bodies remained separated from the inner solar system due to formation of Jupiter. Taken together, we propose that the ungrouped irons, ESP, and ungrouped achondrites could possibly represent the differentiated sections, such as core, core–mantle, and mantle of a planetesimal(s), respectively, with the Allende CV3 representing an undifferentiated chondritic crust.

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Early solar system chronology from short-lived chronometers

Anand

Mezger

2023

Geochemistry

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Genetics, age and crystallization history of group IIC iron meteorites

Cited by 25 publications

References 49 publications

Crystallization histories of the group IIF iron meteorites and Eagle Station pallasites

Crystallization histories of the group IIF iron meteorites and Eagle Station pallasites

Evaluating the O‐Cr‐Mo isotope signatures in various meteorites representing core–mantle–crust fragments: Implications for partially differentiated planetesimal(s) accreted in the early outer solar system

Early solar system chronology from short-lived chronometers

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