ArticleNature geoscience2025
Mineralogical evidence for hydrothermal alteration of Bennu samples.
Article in Nature geoscience, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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14 citing papers in PubMed.
- Gradual Destruction of Refractory Stardust in Alkali Brines on Asteroid Bennu.Nature communications · 2026Article
- Ryugu and Bennu preserve primordial isotopic heterogeneity absent from the meteorite record.Nature communications · 2026Article
- Refractory inclusions in Bennu samples indicative of outer Solar System accretion.Nature communications · 2026Article
- Pyrrhotite-driven early-stage terrestrial alteration in Ryugu grains.Nature communications · 2026Article
- Nanoscale infrared spectroscopy reveals complex organic-mineral assemblages in asteroid Bennu.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Distribution of extraterrestrial nucleobases, other N-heterocycles, and their precursors in a sample from asteroid Bennu.Communications chemistry · 2026Article
- Low thermal inertia of carbonaceous asteroid Bennu driven by cracks observed in returned samples.Nature communications · 2026Article
- Multiple formation pathways for amino acids in the early Solar System based on carbon and nitrogen isotopes in asteroid Bennu samples.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Potential metabolic viability on asteroid chemistry.Communications chemistry · 2026Article
- Hydrothermal alteration of Ryugu from a disruptive impact recorded in a returned sample.Nature communications · 2025Article
- The variety and origin of materials accreted by Bennu's parent asteroid.Nature astronomy · 2025Article
- Nitrogen- and oxygen-rich organic material indicative of polymerization in pre-aqueous cryochemistry on Bennu's parent body.Nature astronomy · 2025Article
- Space weathering effects in Bennu asteroid samples.Nature geoscience · 2025Article
- Abundant supernova dust and heterogeneous aqueous alteration revealed by stardust in two lithologies of asteroid Bennu.Nature astronomy · 2025Article
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73 authors.
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Abstract
Samples of asteroid (101955) Bennu delivered by the OSIRIS-REx mission offer the opportunity to study pristine planetary materials unchanged by exposure to the terrestrial environment. Here we use a combination of X-ray diffraction and various electron microscopy techniques to explore the detailed mineralogy of Bennu samples and determine the alteration history of the planetesimal protolith from which they originated. The samples consist largely of hydrated sheet-silicate minerals, namely nanoscale serpentine and saponite of varied grain size, which are decorated with micro- to nanoscale Fe-sulfides, magnetite and carbonates. We observe sheet silicates parallel and normal to sulfide surfaces and as inclusions in sulfides; sulfur-rich veins transecting the sheet-silicate matrix; zoned carbonates and phosphates and sulfide and magnetite grains exhibiting embayment. The mineralogical evidence indicates alteration of accreted minerals by a fluid that evolved with time, leading to etching, dissolution and reprecipitation. Sulfide compositions indicate alteration at ~25 °C, similar to conditions inferred for asteroid (162173) Ryugu and Ivuna-type (CI) chondrite meteorites. The fluid probably evolved from neutral to alkaline, culminating with the precipitation of highly soluble salts. We conclude that Bennu's protolith comprised mainly nanometre to micrometre silicates, with fewer chondrules and calcium-aluminium-rich inclusions than those of most chondrite groups.
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