Skip to Main content Skip to Navigation
Journal articles

A unique basaltic micrometeorite expands the inventory of solar system planetary crusts

Abstract : Micrometeorites with diameter ≈100–200 μm dominate the flux of extraterrestrial matter on Earth. The vast majority of micrometeorites are chemically, mineralogically, and isotopically related to carbonaceous chondrites, which amount to only 2.5% of meteorite falls. Here, we report the discovery of the first basaltic micrometeorite (MM40). This micrometeorite is unlike any other basalt known in the solar system as revealed by isotopic data, mineral chemistry, and trace element abundances. The discovery of a new basaltic asteroidal surface expands the solar system inventory of planetary crusts and underlines the importance of micrometeorites for sampling the asteroids' surfaces in a way complementary to meteorites, mainly because they do not suffer dynamical biases as meteorites do. The parent asteroid of MM40 has undergone extensive metamorphism, which ended no earlier than 7.9 Myr after solar system formation. Numerical simulations of dust transport dynamics suggest that MM40 might originate from one of the recently discovered basaltic asteroids that are not members of the Vesta family. The ability to retrieve such a wealth of information from this tiny (a few micrograms) sample is auspicious some years before the launch of a Mars sample return mission.
Complete list of metadata
Contributor : AdminHAL UnivBrestBU Connect in order to contact the contributor
Submitted on : Friday, April 23, 2021 - 11:04:56 AM
Last modification on : Saturday, June 25, 2022 - 9:15:36 PM
Long-term archiving on: : Saturday, July 24, 2021 - 6:25:49 PM


Publisher files allowed on an open archive



Matthieu Gounelle, Marc Chaussidon, Alessandro Morbidelli, Jean-Alix J-A Barrat, Cécile Engrand, et al.. A unique basaltic micrometeorite expands the inventory of solar system planetary crusts. Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 2009, 106, pp.6904-6909. ⟨10.1073/pnas.0900328106⟩. ⟨insu-00377414⟩



Record views


Files downloads