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• W3206890478 abstract "• Mineralogical mapping at high spatial resolution of small zircons in lunar samples. • Imaging of phase assemblages reveals various different impact related textures. • High spatial resolution U-Pb SIMS dating allows to date zircons of <10 μ m size. • New zircon 207 Pb- 206 Pb ages are between 4.15 and 4.25 Ga. • Zircon ages likely reflect the early formation of large impact basins on the moon. Because of their robustness against resetting, in situ U-Pb ages of zircons in lunar impactites have the potential to provide constraints on the lunar bombardment history that may complement the more common K-Ar ages. Most previous work has focused on relatively large zircons that show growth zoning and ages were mostly interpreted as early igneous crystallization ages. Here we combine high-resolution mineralogical imaging and in situ U-Pb dating by ion microprobe to identify, characterize and date <20 μm size zircons in thin sections of lunar impact breccias. Several tens of grains of zircons of this size range were identified in thin sections of impactites from the Apollo 15 and 16 landing sites. Small zircons are more abundant in both noritic and evolved clinopyroxene, SiO 2 or K-feldspar bearing lithologies compared to anorthositic bulk compositions. Both granular zircon aggregates and overgrowth on existing zircon or baddeleyite (in breccias 15455 and 67915) are interpreted to reflect high-temperature recrystallization of zircons or its high-temperature-pressure precursor phases, following shock heating events by impact. In contrast, conchoidal or poikilitic zircons <10 μm in Fe-Ni metal bearing noritic clasts or matrix (67915, 67955) crystallized in situ from impact melt. Most U-Pb ages of the 24 analyzed grains are either concordant or reverse discordant with 207 Pb- 206 Pb ages ranging from 4.15 to 4.25 Ga. The small age range, combined with a large textural spectrum and the frequent presence of Fe-Ni metal suggest zircon crystallization from impact melt and recrystallization of pre-existing zirconium-bearing minerals by impact heating. Such ‘impact’ zircons with 4.2 Ga ages have now been reported from most Apollo landing sites, suggesting widespread formation and modification of zircons by basin-forming impacts at this time. The contrast between U-Pb zircon (predominantly 4.2 Ga) and K-Ar feldspar ages (predominantly 3.9 Ga) likely reflects resetting of the latter chronometer by impact heating." @default.
• W3206890478 created "2021-10-25" @default.
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• W3206890478 date "2021-12-01" @default.
• W3206890478 modified "2023-09-27" @default.
• W3206890478 title "Impact-related crystallization and modification of small zircons in Apollo 15 and 16 impactites at 4.2 Ga" @default.
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• W3206890478 doi "https://doi.org/10.1016/j.epsl.2021.117216" @default.
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