Science· 2026Q1
The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites
- 2citations
- Q1SCImago
- 2026year
Short summary
The parent bodies of the Ryugu asteroid and Ivuna-type carbonaceous chondrites (CIs) formed less than 2 million years after the Solar System's start, predating most other carbonaceous chondrites.
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Key points
- Ryugu asteroid and Ivuna-type carbonaceous chondrites (CIs) lack chondrules, unlike most other carbonaceous chondrites.
- Ryugu and CIs share distinct isotopic properties, suggesting different formation times or locations.
- Manganese-chromium dating and oxygen isotope thermometry were applied to Ryugu and Ivuna samples.
- Their parent bodies formed <2 million years after Solar System formation, before most other CCs.
AI-generated from the title and abstract; the full text is not read.
Abstract
Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share isotopic properties distinct from those of other CCs, implying that their parent bodies formed at a different time or place than those of other CCs. We applied manganese-chromium dating and oxygen isotope thermometry to Ryugu and Ivuna samples. The results indicate that the parent bodies of Ryugu and Ivuna formed less than 2 million years after the beginning of Solar System formation-before the majority of chondrules in CCs and the parent bodies of other CCs formed. This implies that Ryugu and CIs are remnants of an earlier generation of carbonaceous planetesimals.
The authors' abstract, as published at the source. Science, 2026 · DOI ↗
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Field: Astronomy and Astrophysics
Astronomy and AstrophysicsPhysics and Astronomy