Skip to Main content Skip to Navigation
Journal articles

Analytical protocols for Phobos regolith samples returned by the Martian Moons eXploration (MMX) mission

Abstract : Japan Aerospace Exploration Agency (JAXA) will launch a spacecraft in 2024 for a sample return mission from Phobos (Martian Moons eXploration: MMX). Touchdown operations are planned to be performed twice at different landing sites on the Phobos surface to collect > 10 g of the Phobos surface materials with coring and pneumatic sampling systems on board. The Sample Analysis Working Team (SAWT) of MMX is now designing analytical protocols of the returned Phobos samples to shed light on the origin of the Martian moons as well as the evolution of the Mars-moon system. Observations of petrology and mineralogy, and measurements of bulk chemical compositions and stable isotopic ratios of, e.g., O, Cr, Ti, and Zn can provide crucial information about the origin of Phobos. If Phobos is a captured asteroid composed of primitive chondritic materials, as inferred from its reflectance spectra, geochemical data including the nature of organic matter as well as bulk H and N isotopic compositions characterize the volatile materials in the samples and constrain the type of the captured asteroid. Cosmogenic and solar wind components, most pronounced in noble gas isotopic compositions, can reveal surface processes on Phobos. Long- and short-lived radionuclide chronometry such as 53Mn-53Cr and 87Rb-87Sr systematics can date pivotal events like impacts, thermal metamorphism, and aqueous alteration on Phobos. It should be noted that the Phobos regolith is expected to contain a small amount of materials delivered from Mars, which may be physically and chemically different from any Martian meteorites in our collection and thus are particularly precious. The analysis plan will be designed to detect such Martian materials, if any, from the returned samples dominated by the endogenous Phobos materials in curation procedures at JAXA before they are processed for further analyses.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03589774
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Saturday, February 26, 2022 - 7:55:36 AM
Last modification on : Friday, August 5, 2022 - 12:01:21 PM
Long-term archiving on: : Friday, May 27, 2022 - 6:06:19 PM

File

s40623-021-01438-9.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Wataru Fujiya, Yoshihiro Furukawa, Haruna Sugahara, Mizuho Koike, Ken-Ichi Bajo, et al.. Analytical protocols for Phobos regolith samples returned by the Martian Moons eXploration (MMX) mission. Earth Planets and Space, Springer/Terra Scientific Publishing Company, 2021, 73, pp.7477-7495. ⟨10.1186/s40623-021-01438-9⟩. ⟨insu-03589774⟩

Share

Metrics

Record views

40

Files downloads

5