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Evidence of extensive lunar crust formation in impact melt sheets 4,330 Myr ago
Swedish Museum of Natural History, Department of Geology. (Nordsim)ORCID iD: 0000-0003-2227-577X
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2020 (English)In: Nature Astronomy, E-ISSN 2397-3366, Vol. 4, no 10, p. 974-978Article in journal (Refereed) Published
Abstract [en]

Accurately constraining the formation and evolution of the lunar magnesian suite is key to understanding the earliest periods of magmatic crustal building that followed accretion and primordial differentiation of the Moon. However, the origin and evolution of these unique rocks is highly debated. Here, we report on the microstructural characterization of a large (~250-μm) baddeleyite (monoclinic-ZrO2) grain in Apollo troctolite 76535 that preserves quantifiable crystallographic relationships indicative of reversion from a precursor cubic-ZrO2 phase. This observation places important constraints on the formation temperature of the grain (>2,300 °C), which endogenic processes alone fail to reconcile. We conclude that the troctolite crystallized directly from a large, differentiated impact melt sheet 4,328 ± 8 Myr ago. These results suggest that impact bombardment would have played a critical role in the evolution of the earliest planetary crusts.

Place, publisher, year, edition, pages
2020. Vol. 4, no 10, p. 974-978
National Category
Geochemistry
Research subject
The changing Earth
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URN: urn:nbn:se:nrm:diva-3916DOI: 10.1038/s41550-020-1092-5OAI: oai:DiVA.org:nrm-3916DiVA, id: diva2:1507045
Available from: 2020-12-06 Created: 2020-12-06 Last updated: 2022-02-10Bibliographically approved

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Publisher's full texthttps://doi.org/10.1038/s41550-020-1092-5

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