Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials

Daisuke Nakashima; Tomoki Nakamura; Mingming Zhang; Noriko T. Kita; Takashi Mikouchi; Hideto Yoshida; Yuma Enokido; Tomoyo Morita; Mizuha Kikuiri; Kana Amano; Eiichi Kagawa; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tatsuaki Okada; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Satoru Nakazawa; Fuyuto Terui; Hisayoshi Yurimoto; Takaaki Noguchi; Hikaru Yabuta; Hiroshi Naraoka; Ryuji Okazaki; Kanako Sakamoto; Sei ichiro Watanabe; Shogo Tachibana; Yuichi Tsuda

doi:10.1038/s41467-023-36268-8

Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials

Daisuke Nakashima, Tomoki Nakamura, Mingming Zhang, Noriko T. Kita, Takashi Mikouchi, Hideto Yoshida, Yuma Enokido, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto YoshikawaTakanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Hisayoshi Yurimoto, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Sei ichiro Watanabe, Shogo Tachibana, Yuichi Tsuda

Material Science of Solar Planets

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and CAIs. Three chondrule-like objects dominated by Mg-rich olivine are ¹⁶O-rich and -poor with Δ¹⁷O (=δ¹⁷O – 0.52 × δ¹⁸O) values of ~ –23‰ and ~ –3‰, resembling what has been proposed as early generations of chondrules. The ¹⁶O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into ¹⁶O-poor chondrule precursor dust. Two CAIs composed of refractory minerals are ¹⁶O-rich with Δ¹⁷O of ~ –23‰ and possibly as old as the oldest CAIs. The discovered objects (<30 µm) are as small as those from comets, suggesting radial transport favoring smaller objects from the inner solar nebula to the formation location of the Ryugu original parent body, which is farther from the Sun and scarce in chondrules. The transported objects may have been mostly destroyed during aqueous alteration in the Ryugu parent body.

Original language	English
Article number	532
Journal	Nature communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-36268-8
Publication status	Published - Dec 2023

All Science Journal Classification (ASJC) codes

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

Access to Document

10.1038/s41467-023-36268-8

Cite this

Nakashima, D., Nakamura, T., Zhang, M., Kita, N. T., Mikouchi, T., Yoshida, H., Enokido, Y., Morita, T., Kikuiri, M., Amano, K., Kagawa, E., Yada, T., Nishimura, M., Nakato, A., Miyazaki, A., Yogata, K., Abe, M., Okada, T., Usui, T., ... Tsuda, Y. (2023). Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials. Nature communications, 14(1), Article 532. https://doi.org/10.1038/s41467-023-36268-8

Nakashima, D, Nakamura, T, Zhang, M, Kita, NT, Mikouchi, T, Yoshida, H, Enokido, Y, Morita, T, Kikuiri, M, Amano, K, Kagawa, E, Yada, T, Nishimura, M, Nakato, A, Miyazaki, A, Yogata, K, Abe, M, Okada, T, Usui, T, Yoshikawa, M, Saiki, T, Tanaka, S, Nakazawa, S, Terui, F, Yurimoto, H, Noguchi, T, Yabuta, H, Naraoka, H , Okazaki, R, Sakamoto, K, Watanabe, SI, Tachibana, S & Tsuda, Y 2023, 'Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials', Nature communications, vol. 14, no. 1, 532. https://doi.org/10.1038/s41467-023-36268-8

@article{1df55f17b790403881b58f526cfe67b2,

title = "Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials",

abstract = "Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and CAIs. Three chondrule-like objects dominated by Mg-rich olivine are 16O-rich and -poor with Δ17O (=δ17O – 0.52 × δ18O) values of ~ –23‰ and ~ –3‰, resembling what has been proposed as early generations of chondrules. The 16O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into 16O-poor chondrule precursor dust. Two CAIs composed of refractory minerals are 16O-rich with Δ17O of ~ –23‰ and possibly as old as the oldest CAIs. The discovered objects (<30 µm) are as small as those from comets, suggesting radial transport favoring smaller objects from the inner solar nebula to the formation location of the Ryugu original parent body, which is farther from the Sun and scarce in chondrules. The transported objects may have been mostly destroyed during aqueous alteration in the Ryugu parent body.",

author = "Daisuke Nakashima and Tomoki Nakamura and Mingming Zhang and Kita, {Noriko T.} and Takashi Mikouchi and Hideto Yoshida and Yuma Enokido and Tomoyo Morita and Mizuha Kikuiri and Kana Amano and Eiichi Kagawa and Toru Yada and Masahiro Nishimura and Aiko Nakato and Akiko Miyazaki and Kasumi Yogata and Masanao Abe and Tatsuaki Okada and Tomohiro Usui and Makoto Yoshikawa and Takanao Saiki and Satoshi Tanaka and Satoru Nakazawa and Fuyuto Terui and Hisayoshi Yurimoto and Takaaki Noguchi and Hikaru Yabuta and Hiroshi Naraoka and Ryuji Okazaki and Kanako Sakamoto and Watanabe, {Sei ichiro} and Shogo Tachibana and Yuichi Tsuda",

note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",

year = "2023",

month = dec,

doi = "10.1038/s41467-023-36268-8",

language = "English",

volume = "14",

journal = "Nature communications",

issn = "2041-1723",

publisher = "Nature Research",

number = "1",

}

TY - JOUR

T1 - Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials

AU - Nakashima, Daisuke

AU - Nakamura, Tomoki

AU - Zhang, Mingming

AU - Kita, Noriko T.

AU - Mikouchi, Takashi

AU - Yoshida, Hideto

AU - Enokido, Yuma

AU - Morita, Tomoyo

AU - Kikuiri, Mizuha

AU - Amano, Kana

AU - Kagawa, Eiichi

AU - Yada, Toru

AU - Nishimura, Masahiro

AU - Nakato, Aiko

AU - Miyazaki, Akiko

AU - Yogata, Kasumi

AU - Abe, Masanao

AU - Okada, Tatsuaki

AU - Usui, Tomohiro

AU - Yoshikawa, Makoto

AU - Saiki, Takanao

AU - Tanaka, Satoshi

AU - Nakazawa, Satoru

AU - Terui, Fuyuto

AU - Yurimoto, Hisayoshi

AU - Noguchi, Takaaki

AU - Yabuta, Hikaru

AU - Naraoka, Hiroshi

AU - Okazaki, Ryuji

AU - Sakamoto, Kanako

AU - Watanabe, Sei ichiro

AU - Tachibana, Shogo

AU - Tsuda, Yuichi

PY - 2023/12

Y1 - 2023/12

N2 - Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and CAIs. Three chondrule-like objects dominated by Mg-rich olivine are 16O-rich and -poor with Δ17O (=δ17O – 0.52 × δ18O) values of ~ –23‰ and ~ –3‰, resembling what has been proposed as early generations of chondrules. The 16O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into 16O-poor chondrule precursor dust. Two CAIs composed of refractory minerals are 16O-rich with Δ17O of ~ –23‰ and possibly as old as the oldest CAIs. The discovered objects (<30 µm) are as small as those from comets, suggesting radial transport favoring smaller objects from the inner solar nebula to the formation location of the Ryugu original parent body, which is farther from the Sun and scarce in chondrules. The transported objects may have been mostly destroyed during aqueous alteration in the Ryugu parent body.

AB - Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and CAIs. Three chondrule-like objects dominated by Mg-rich olivine are 16O-rich and -poor with Δ17O (=δ17O – 0.52 × δ18O) values of ~ –23‰ and ~ –3‰, resembling what has been proposed as early generations of chondrules. The 16O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into 16O-poor chondrule precursor dust. Two CAIs composed of refractory minerals are 16O-rich with Δ17O of ~ –23‰ and possibly as old as the oldest CAIs. The discovered objects (<30 µm) are as small as those from comets, suggesting radial transport favoring smaller objects from the inner solar nebula to the formation location of the Ryugu original parent body, which is farther from the Sun and scarce in chondrules. The transported objects may have been mostly destroyed during aqueous alteration in the Ryugu parent body.

UR - http://www.scopus.com/inward/record.url?scp=85148263249&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85148263249&partnerID=8YFLogxK

U2 - 10.1038/s41467-023-36268-8

DO - 10.1038/s41467-023-36268-8

M3 - Article

C2 - 36797235

AN - SCOPUS:85148263249

SN - 2041-1723

VL - 14

JO - Nature communications

JF - Nature communications

IS - 1

M1 - 532

ER -

Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this