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Highly siderophile element abundances and ^187^Re‐^187^Os systematics in the Tafassasset carbonaceous‐like primitive achondrite by Robert W. Nicklas; Kathryn G. Gardner‐Vandy; James M. D. Day is a Physics and Astronomy article available to read on EtoBox.

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## Abstract Highly siderophile elements (HSE) strongly partition into metal phases over silicate minerals and so offer important constraints on nebular and core formation processes acting on early planetesimals. Abundances of the HSE are also an important tool for constraining relationships between metal‐rich meteorites. The first bulk rock and in situ HSE abundance and ^187^Re‐^187^Os data are reported for the ungrouped metal‐rich achondrite Tafassasset to examine models of its petrogenesis and origin. Bulk rock and metal grain HSE abundances are elevated at ~2 and ~15 times CI chondrite abundances, respectively, and are largely unfractionated from one another. Metal within Tafassasset is therefore likely to have quenched shortly after partial melting without significant fractional crystallization. Metal grain HSE abundances can be used to calculate a metal fraction of 14 ± 4 wt%, overlapping with the parent bodies of CC iron meteorites, which have also been related to Tafassasset using nucleosynthetic isotope anomalies. Despite such similarities, HSE systematics of bulk rock Tafassasset are not equivalent to any known chondrites, and metal grains do not overlap with iron meteorit

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Author

Robert W. Nicklas; Kathryn G. Gardner‐Vandy; James M. D. Day

Publisher

Wiley

Published

2024

Language

EN

Field

Physics and Astronomy (Physical Sciences)