Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2
2022 | journal article. A publication with affiliation to the University of Göttingen.
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Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2
Kawasaki, N.; Nagashima, K.; Sakamoto, N.; Matsumoto, T.; Bajo, K.-i.; Wada, S. & Igami, Y. et al. (2022)
Science Advances, 8(50) art. eade2067. DOI: https://doi.org/10.1126/sciadv.ade2067
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Details
- Authors
- Kawasaki, Noriyuki; Nagashima, Kazuhide; Sakamoto, Naoya; Matsumoto, Toru; Bajo, Ken-ichi; Wada, Sohei; Igami, Yohei; Miyake, Akira; Noguchi, Takaaki; Yamamoto, Daiki; Yurimoto, Hisayoshi
- Abstract
- 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. - Issue Date
- 2022
- Journal
- Science Advances
- eISSN
- 2375-2548
- Language
- English
