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Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

MPG-Autoren
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Kleine,  Thorsten
Planetary Science Department, Max Planck Institute for Solar System Research, Max Planck Society;

Externe Ressourcen

https://ui.adsabs.harvard.edu/abs/2022SciA....8E2067K
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Kawasaki, N., Nagashima, K., Sakamoto, N., Matsumoto, T., Bajo, K.-i., Wada, S., et al. (2022). Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2. Science Advances, 8, eade2067. doi:10.1126/sciadv.ade2067.


Zitierlink: https://hdl.handle.net/21.11116/0000-000D-B883-F
Zusammenfassung
The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically and mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. Here, we show that high-temperature anhydrous primary minerals in Ryugu and CI chondrites exhibit a bimodal distribution of oxygen isotopic compositions: 16 O-rich (associated with refractory inclusions) and 16 O-poor (associated with chondrules). Both the 16 O-rich and 16 O-poor minerals probably formed in the inner solar protoplanetary disk and were subsequently transported outward. The abundance ratios of the 16 O-rich to 16 O-poor minerals in Ryugu and CI chondrites are higher than in other carbonaceous chondrite groups but are similar to that of comet 81P/Wild2, suggesting that Ryugu and CI chondrites accreted in the outer Solar System closer to the accretion region of comets. C-type asteroid Ryugu formed in the outer Solar System close to the accretion region of 81P/Wild2 comet.