Nucleosynthetic Pt isotope anomalies and the Hf-W chronology of core formation in inner and outer solar system planetesimals

Spitzer, Fridolin; Burkhardt, C.; Nimmo, F.; Kleine, T.

doi:10.1016/j.epsl.2021.117211

Cited by 41 publications

(26 citation statements)

References 47 publications

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“…In this pressure bump, inward drifting CAIs could accumulate for several million years, resulting in the enrichment of CAIs observed in some carbonaceous chondrites ( 63 ). Because the CC-iron parent bodies accreted within ~1 Ma after CAI formation ( 5 , 16 ), our study suggests the outward RMN enrichment in the protoplanetary disk occurred even earlier.…”

Section: Discussionmentioning

confidence: 78%

“…Iron meteorites can be classified into two broad categories, “magmatic” and “nonmagmatic.” Magmatic iron meteorites show compositional evidence for having formed by fractional crystallization within well-mixed molten metallic cores in differentiated asteroids ( 13 – 15 ). The parent bodies of magmatic iron meteorites are the earliest differentiated asteroids, accreting within ~1 Ma of solar system history ( 5 , 16 ). Notably, the iron meteorite parent bodies formed earlier than the (unmelted) chondritic asteroids ( 17 ).…”

Section: Introductionmentioning

confidence: 99%

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Compositions of carbonaceous-type asteroidal cores in the early solar system

2022

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The parent cores of iron meteorites belong to the earliest accreted bodies in the solar system. These cores formed in two isotopically distinct reservoirs: noncarbonaceous (NC) type and carbonaceous (CC) type in the inner and outer solar system, respectively. We measured elemental compositions of CC-iron groups and used fractional crystallization modeling to reconstruct the bulk compositions and crystallization processes of their parent asteroidal cores. We found generally lower S and higher P in CC-iron cores than in NC-iron cores and higher HSE (highly siderophile element) abundances in some CC-iron cores than in NC-iron cores. We suggest that the different HSE abundances among the CC-iron cores are related to the spatial distribution of refractory metal nugget–bearing calcium aluminum–rich inclusions (CAIs) in the protoplanetary disk. CAIs may have been transported to the outer solar system and distributed heterogeneously within the first million years of solar system history.

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Section: Discussionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Compositions of carbonaceous-type asteroidal cores in the early solar system

2022

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“…for nucleosynthetic Pt isotope variations are slightly younger (1 − 2 Myr for NC meteorites and 3 − 3.5 Myr for CC meteorites(Spitzer, Burkhardt, Nimmo and Kleine, 2021)). In the case of NC iron meteorites, these younger ages were confirmed by Mn − Cr chronometry (0.4 − 2.2 Myr)(Anand, Pape, Wille, Mezger and Hofmann, 2021).…”

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confidence: 94%

Structure of differentiated planetesimals: A chondritic fridge on top of a magma ocean

Limare

Chaussidon

Kaminski

2022

Icarus

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“…I thus suggest reviving the older structural classes, at least at the highest level-hexahedrite, octahedrite, ataxite (see Fig. 3)-which incidentally, in being chiefly controlled by Ni content, roughly correlates with the redox state of the parent body, with more oxidized conditions apparently prevailing for C irons (e.g., Hilton et al, 2022;Spitzer et al, 2021). For many irons, structural classes can be extracted from Buchwald's (1975) compilation.…”

Section: Ironsmentioning

confidence: 99%

“…Now there are arguably meteorites which are not even remotely associated with any group whatsoever, such as many chemically anomalous irons, so they could still be called “ungrouped” (as a distinction from classwise anomalies). Yet, increasingly systematically, anomalous meteorites are subjected to isotopic analyses (e.g., Spitzer et al., 2021), which may reveal affinity, if not to known “clans,” at least to the NC or the C superclans. So, for instance, the eucrite‐like NWA 011 meteorite, which plots in the C field in a δ 50 Ti‐δ 54 Cr diagram (e.g., Warren, 2011a, 2011b) should be classified as “basaltic achondrite, C‐an”, which would be more informative than its current classification as simply “achondrite, ungrouped.” We have likewise “NC‐an pallasites” and “C‐an pallasites,” as depicted in Fig.…”

Section: Principles Of a Binominal Schemementioning

confidence: 99%

Meteorite petrology versus genetics: Toward a unified binominal classification

Jacquet

2022

Meteorit & Planetary Scien

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The current meteorite taxonomy, a result of two centuries of meteorite research and tradition, entangles textural and genetic terms in a less than consistent fashion, with some taxa (like "shergottites") representing varied lithologies from a single putative parent body while others (like "pallasites") subsume texturally similar objects of multifarious solar system origins. The familiar concept of "group" as representative of one primary parent body is also difficult to define empirically. It is proposed that the classification becomes explicitly binominal throughout the meteorite spectrum, with classes referring to petrographically defined primary rock types, whereas groups retain a genetic meaning, but no longer tied to any assumption on the number of represented parent bodies. The classification of a meteorite would thus involve both a class and a group, in a twodimensional fashion analogous to the way Van Schmus and Wood decoupled primary and secondary properties in chondrites. Since groups would not substantially differ, at first, from those in current use de facto, the taxonomic treatment of "normal" meteorites, whose class would bring no new information, would hardly change. Yet classes combined with high-or low-level groups would provide a standardized grid to characterize petrographically and/or isotopically unusual or anomalous meteorites-which make up the majority of represented meteorite parent bodies-for example, in relation to the carbonaceous/ noncarbonaceous dichotomy. In the longer term, the mergers of genetically related groups, a more systematic treatment of lithology mixtures, and the chondrite/achondrite transition can further simplify the nomenclature.

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Nucleosynthetic Pt isotope anomalies and the Hf-W chronology of core formation in inner and outer solar system planetesimals

Cited by 41 publications

References 47 publications

Compositions of carbonaceous-type asteroidal cores in the early solar system

Compositions of carbonaceous-type asteroidal cores in the early solar system

Structure of differentiated planetesimals: A chondritic fridge on top of a magma ocean

Meteorite petrology versus genetics: Toward a unified binominal classification

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