Non-Mercurian Origin of Ungrouped Achondrite Northwest Africa 7325 from (U-Th)/He Thermochronology

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Diaz C. A. Rollin S. M.* Flowers R. M. Crow C. A. Metcalf J. R.

METSOC 2026 abstract (PDF)

“The preservation of (U-Th)/He ages in merrillite in the ungrouped achondrite NWA 7325 that are much older than the meteorite’s cosmic-ray exposure age is inconsistent with the expected thermal and 4He retention history for a meteorite from Mercury.”

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