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A micrometeorite from a stony asteroid identified in Luna 16 soil
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia.
Swedish Museum of Natural History, Sweden.
Uppsala University, Sweden.
Swedish Museum of Natural History, Sweden; Curtin University, Australia.
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2022 (English)In: Nature Astronomy, E-ISSN 2397-3366, Vol. 6, no 5, p. 560-567Article in journal (Refereed) Published
Abstract [en]

Despite the intense cratering history of the Moon, very few traces of meteoritic material have been identified in the more than 380 kg of samples returned to Earth by the Apollo and Luna missions. Here we show that an ~200-µm-sized fragment collected by the Luna 16 mission has extra-lunar origins and probably originates from an LL chondrite with similar properties to near-Earth stony asteroids. The fragment has not experienced temperatures higher than 400 °C since its protolith formed early in the history of the Solar System. It arrived on the Moon, either as a micrometeorite or as the result of the break-up of a bigger impact, no earlier than 3.4 Gyr ago and possibly around 1 Gyr ago, an age that would be consistent with impact ages inferred from basaltic fragments in the Luna 16 sample and of a known dynamic upheaval in the Flora asteroid family, which is thought to be the source of L and LL chondrite meteorites. These results highlight the importance of extra-lunar fragments in constraining the impact history of the Earth–Moon system and suggest that material from LL chondrite asteroids may be an important component. © 2022, The Author(s)

Place, publisher, year, edition, pages
Nature Research , 2022. Vol. 6, no 5, p. 560-567
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:ri:diva-59062DOI: 10.1038/s41550-022-01623-0Scopus ID: 2-s2.0-85126761335OAI: oai:DiVA.org:ri-59062DiVA, id: diva2:1653210
Note

Funding details: Ministry of Education and Science of the Russian Federation, Minobrnauka, 075-15-2020-780, N13.1902.21.0039; Funding details: Vetenskapsrådet, VR, 2017-00671, 2017-04151, 2020-03828; Funding text 1: We thank F. Kirally (Vienna University) and D. Topa (NHM Vienna) for their help with microprobe analyses. S.I.D. acknowledges the support of the Ministry of Science and Higher Education of the Russian Federation under the grant 075-15-2020-780 (N13.1902.21.0039). M.J.W., A.A.N. and R.M. acknowledge support from Swedish Research Council (VR) grants 2017-04151 and 2020-03828. The NordSIMS facility is supported by VR research infrastructure grant 2017-00671; this is NordSIMS publication 704.

Available from: 2022-04-21 Created: 2022-04-21 Last updated: 2023-03-30Bibliographically approved

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Dobryden, Illia

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