Insights into pyroxene-dominated surfaces and implications for ongoing space exploration missions

Rider-Stokes, B.G.; Branagan-Harris, E.; Markus, K.; Snape, J.F.; Jackson, S.L.; Russell, S.S.; Greenwood, R.C.; Burbine, T.H.; Whitehouse, M.J.; Rothery, D.A.; White, L.F.; Grady, M.M.

Research article (journal) | Peer reviewed

Abstract

Ungrouped achondrites are differentiated (melted) meteorites that do not fit into any known meteorite group because of their unusual mineralogies and/or oxygen isotopic compositions; their asteroidal or planetary origins are unknown. Two recently discovered samples, Northwest Africa 15915 (NWA 15915) and Ksar Ghilane 022 (KG 022), have mineral assemblages not previously identified in meteorites, consisting of iron-free silicates (including augite, enstatite, and olivine) and unusual sulphides (such as oldhamite). These samples offer the opportunity to probe the spectral properties of mineralogically distinct surfaces. NWA 15915 and KG 022 have oxygen isotopic compositions in the field of enstatite chondrites and aubrites, a near absence of spectral features in the visible and near-infrared, and a similar mineralogy to that which is expected for the surface of Mercury. While it is unlikely that the two meteorites are fragments of Mercury, they may be good analogs for Mercury's surface on a regional scale. ESA/JAXA's BepiColombo will provide an exceptional opportunity to compare the composition of differing mineralogical units on Mercury with samples such as NWA 15915 and KG 022.

Details about the publication

JournalIcarus
Volume441
Article number116713
StatusPublished
Release year2025 (15/11/2025)
Language in which the publication is writtenEnglish
DOI10.1016/j.icarus.2025.116713
Link to the full texthttps://www.sciencedirect.com/science/article/pii/S0019103525002611
KeywordsAsteroids composition; Asteroids surfaces; Mercury surface; Meteorites; Spectrophotometry

Authors from the University of Münster

Markus, Kathrin
Professorship for geological planetology (Prof. Hiesinger)