Nonequilibrium spherulitic magnetite in the Ryugu samples

Elena Dobrică; Hope A. Ishii; John P. Bradley; Kenta Ohtaki; Adrian J. Brearley; Takaaki Noguchi; Toru Matsumoto; Akira Miyake; Yohei Igami; Mitsutaka Haruta; Hikaru Saito; Satoshi Hata; Yusuke Seto; Masaaki Miyahara; Naotaka Tomioka; Hugues Leroux; Corentin Le Guillou; Damien Jacob; Francisco de la Peña; Sylvain Laforet; Maya Marinova; Falko Langenhorst; Dennis Harries; Pierre Beck; Thi H.V. Phan; Rolando Rebois; Neyda M. Abreu; Jennifer Gray; Thomas Zega; Pierre M. Zanetta; Michelle S. Thompson; Rhonda Stroud; Kate Burgess; Brittany A. Cymes; John C. Bridges; Leon Hicks; Martin R. Lee; Luke Daly; Phil A. Bland; Michael E. Zolensky; David R. Frank; James Martinez; Akira Tsuchiyama; Masahiro Yasutake; Junya Matsuno; Shota Okumura; Itaru Mitsukawa; Kentaro Uesugi; Masayuki Uesugi; Akihisa Takeuchi; Mingqi Sun; Satomi Enju; Aki Takigawa; Tatsuhiro Michikami; Tomoki Nakamura; Megumi Matsumoto; Yusuke Nakauchi; Hisayoshi Yurimoto; Ryuji Okazaki; Hikaru Yabuta; Hiroshi Naraoka; Kanako Sakamoto; Shogo Tachibana; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tatsuaki Okada; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Sei ichiro Watanabe; Yuichi Tsuda

doi:10.1016/j.gca.2023.02.003

Nonequilibrium spherulitic magnetite in the Ryugu samples

Elena Dobrică, Hope A. Ishii, John P. Bradley, Kenta Ohtaki, Adrian J. Brearley, Takaaki Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta, Hikaru Saito, Satoshi Hata, Yusuke Seto, Masaaki Miyahara, Naotaka Tomioka, Hugues Leroux, Corentin Le Guillou, Damien Jacob, Francisco de la Peña, Sylvain LaforetMaya Marinova, Falko Langenhorst, Dennis Harries, Pierre Beck, Thi H.V. Phan, Rolando Rebois, Neyda M. Abreu, Jennifer Gray, Thomas Zega, Pierre M. Zanetta, Michelle S. Thompson, Rhonda Stroud, Kate Burgess, Brittany A. Cymes, John C. Bridges, Leon Hicks, Martin R. Lee, Luke Daly, Phil A. Bland, Michael E. Zolensky, David R. Frank, James Martinez, Akira Tsuchiyama, Masahiro Yasutake, Junya Matsuno, Shota Okumura, Itaru Mitsukawa, Kentaro Uesugi, Masayuki Uesugi, Akihisa Takeuchi, Mingqi Sun, Satomi Enju, Aki Takigawa, Tatsuhiro Michikami, Tomoki Nakamura, Megumi Matsumoto, Yusuke Nakauchi, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei ichiro Watanabe, Yuichi Tsuda

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

14 Scopus citations

Abstract

We have investigated several particles collected during each of two touchdowns of the Hayabusa2 spacecraft at the surface of the C-type asteroid 162173 Ryugu using various electron microscope techniques. Our detailed transmission electron microscopy study shows the presence of magnetite with various morphologies coexisting in close proximity. This is characteristic of CI chondrite-like materials and consistent with the mineral assemblages and compositions in the Ryugu parent body. We describe the microstructural characteristics of magnetite with different morphologies, which could have resulted from the chemical conditions (growth vs. diffusion rate) during their formation. Furthermore, we describe the presence of magnetites with a spherulitic structure composed of individual radiating fibers that are characterized by pervasive, homogeneously distributed euhedral to subhedral pores that have not been described in previous chondrite studies. This particular spherulitic structure is consistent with crystallization under nonequilibrium conditions. Additionally, the presence of a high density of defects within the magnetite fibers, the high surface/volume ratio of this morphology, and the presence of amorphous materials in several pores and at the edges of the acicular fibers further support their formation under nonequilibrium conditions. We suggest that the growth processes that lead to this structure result from the solution reaching a supersaturated state, resulting in an adjustment to a lower free energy condition via nucleation and rapid growth.

Original language	English (US)
Pages (from-to)	65-75
Number of pages	11
Journal	Geochimica et Cosmochimica Acta
Volume	346
DOIs	https://doi.org/10.1016/j.gca.2023.02.003
State	Published - Apr 1 2023

Keywords

Aqueous alteration
Magnetite
Nonequilibrium
Return samples
Ryugu

ASJC Scopus subject areas

Geochemistry and Petrology

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10.1016/j.gca.2023.02.003

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Dobrică, E., Ishii, H. A., Bradley, J. P., Ohtaki, K., Brearley, A. J., Noguchi, T., Matsumoto, T., Miyake, A., Igami, Y., Haruta, M., Saito, H., Hata, S., Seto, Y., Miyahara, M., Tomioka, N., Leroux, H., Le Guillou, C., Jacob, D., de la Peña, F., ... Tsuda, Y. (2023). Nonequilibrium spherulitic magnetite in the Ryugu samples. Geochimica et Cosmochimica Acta, 346, 65-75. https://doi.org/10.1016/j.gca.2023.02.003

Dobrică, E, Ishii, HA, Bradley, JP, Ohtaki, K, Brearley, AJ, Noguchi, T, Matsumoto, T, Miyake, A, Igami, Y, Haruta, M, Saito, H, Hata, S, Seto, Y, Miyahara, M, Tomioka, N, Leroux, H, Le Guillou, C, Jacob, D, de la Peña, F, Laforet, S, Marinova, M, Langenhorst, F, Harries, D, Beck, P, Phan, THV, Rebois, R, Abreu, NM, Gray, J, Zega, T, Zanetta, PM, Thompson, MS, Stroud, R, Burgess, K, Cymes, BA, Bridges, JC, Hicks, L, Lee, MR, Daly, L, Bland, PA, Zolensky, ME, Frank, DR, Martinez, J, Tsuchiyama, A, Yasutake, M, Matsuno, J, Okumura, S, Mitsukawa, I, Uesugi, K, Uesugi, M, Takeuchi, A, Sun, M, Enju, S, Takigawa, A, Michikami, T, Nakamura, T, Matsumoto, M, Nakauchi, Y, Yurimoto, H, Okazaki, R, Yabuta, H, Naraoka, H, Sakamoto, K, Tachibana, S, Yada, T, Nishimura, M, Nakato, A, Miyazaki, A, Yogata, K, Abe, M, Okada, T, Usui, T, Yoshikawa, M, Saiki, T, Tanaka, S, Terui, F, Nakazawa, S, Watanabe, SI & Tsuda, Y 2023, 'Nonequilibrium spherulitic magnetite in the Ryugu samples', Geochimica et Cosmochimica Acta, vol. 346, pp. 65-75. https://doi.org/10.1016/j.gca.2023.02.003

@article{2efa6bce9a3a412ab4b7c3246a6bdf99,

title = "Nonequilibrium spherulitic magnetite in the Ryugu samples",

abstract = "We have investigated several particles collected during each of two touchdowns of the Hayabusa2 spacecraft at the surface of the C-type asteroid 162173 Ryugu using various electron microscope techniques. Our detailed transmission electron microscopy study shows the presence of magnetite with various morphologies coexisting in close proximity. This is characteristic of CI chondrite-like materials and consistent with the mineral assemblages and compositions in the Ryugu parent body. We describe the microstructural characteristics of magnetite with different morphologies, which could have resulted from the chemical conditions (growth vs. diffusion rate) during their formation. Furthermore, we describe the presence of magnetites with a spherulitic structure composed of individual radiating fibers that are characterized by pervasive, homogeneously distributed euhedral to subhedral pores that have not been described in previous chondrite studies. This particular spherulitic structure is consistent with crystallization under nonequilibrium conditions. Additionally, the presence of a high density of defects within the magnetite fibers, the high surface/volume ratio of this morphology, and the presence of amorphous materials in several pores and at the edges of the acicular fibers further support their formation under nonequilibrium conditions. We suggest that the growth processes that lead to this structure result from the solution reaching a supersaturated state, resulting in an adjustment to a lower free energy condition via nucleation and rapid growth.",

keywords = "Aqueous alteration, Magnetite, Nonequilibrium, Return samples, Ryugu",

author = "Elena Dobric{\u a} and Ishii, {Hope A.} and Bradley, {John P.} and Kenta Ohtaki and Brearley, {Adrian J.} and Takaaki Noguchi and Toru Matsumoto and Akira Miyake and Yohei Igami and Mitsutaka Haruta and Hikaru Saito and Satoshi Hata and Yusuke Seto and Masaaki Miyahara and Naotaka Tomioka and Hugues Leroux and {Le Guillou}, Corentin and Damien Jacob and {de la Pe{\~n}a}, Francisco and Sylvain Laforet and Maya Marinova and Falko Langenhorst and Dennis Harries and Pierre Beck and Phan, {Thi H.V.} and Rolando Rebois and Abreu, {Neyda M.} and Jennifer Gray and Thomas Zega and Zanetta, {Pierre M.} and Thompson, {Michelle S.} and Rhonda Stroud and Kate Burgess and Cymes, {Brittany A.} and Bridges, {John C.} and Leon Hicks and Lee, {Martin R.} and Luke Daly and Bland, {Phil A.} and Zolensky, {Michael E.} and Frank, {David R.} and James Martinez and Akira Tsuchiyama and Masahiro Yasutake and Junya Matsuno and Shota Okumura and Itaru Mitsukawa and Kentaro Uesugi and Masayuki Uesugi and Akihisa Takeuchi and Mingqi Sun and Satomi Enju and Aki Takigawa and Tatsuhiro Michikami and Tomoki Nakamura and Megumi Matsumoto and Yusuke Nakauchi and Hisayoshi Yurimoto and Ryuji Okazaki and Hikaru Yabuta and Hiroshi Naraoka and Kanako Sakamoto and Shogo Tachibana 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 Fuyuto Terui and Satoru Nakazawa and Watanabe, {Sei ichiro} and Yuichi Tsuda",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2023",

month = apr,

day = "1",

doi = "10.1016/j.gca.2023.02.003",

language = "English (US)",

volume = "346",

pages = "65--75",

journal = "Geochimica et Cosmochimica Acta",

issn = "0016-7037",

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TY - JOUR

T1 - Nonequilibrium spherulitic magnetite in the Ryugu samples

AU - Dobrică, Elena

AU - Ishii, Hope A.

AU - Bradley, John P.

AU - Ohtaki, Kenta

AU - Brearley, Adrian J.

AU - Noguchi, Takaaki

AU - Matsumoto, Toru

AU - Miyake, Akira

AU - Igami, Yohei

AU - Haruta, Mitsutaka

AU - Saito, Hikaru

AU - Hata, Satoshi

AU - Seto, Yusuke

AU - Miyahara, Masaaki

AU - Tomioka, Naotaka

AU - Leroux, Hugues

AU - Le Guillou, Corentin

AU - Jacob, Damien

AU - de la Peña, Francisco

AU - Laforet, Sylvain

AU - Marinova, Maya

AU - Langenhorst, Falko

AU - Harries, Dennis

AU - Beck, Pierre

AU - Phan, Thi H.V.

AU - Rebois, Rolando

AU - Abreu, Neyda M.

AU - Gray, Jennifer

AU - Zega, Thomas

AU - Zanetta, Pierre M.

AU - Thompson, Michelle S.

AU - Stroud, Rhonda

AU - Burgess, Kate

AU - Cymes, Brittany A.

AU - Bridges, John C.

AU - Hicks, Leon

AU - Lee, Martin R.

AU - Daly, Luke

AU - Bland, Phil A.

AU - Zolensky, Michael E.

AU - Frank, David R.

AU - Martinez, James

AU - Tsuchiyama, Akira

AU - Yasutake, Masahiro

AU - Matsuno, Junya

AU - Okumura, Shota

AU - Mitsukawa, Itaru

AU - Uesugi, Kentaro

AU - Uesugi, Masayuki

AU - Takeuchi, Akihisa

AU - Sun, Mingqi

AU - Enju, Satomi

AU - Takigawa, Aki

AU - Michikami, Tatsuhiro

AU - Nakamura, Tomoki

AU - Matsumoto, Megumi

AU - Nakauchi, Yusuke

AU - Yurimoto, Hisayoshi

AU - Okazaki, Ryuji

AU - Yabuta, Hikaru

AU - Naraoka, Hiroshi

AU - Sakamoto, Kanako

AU - Tachibana, Shogo

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 - Terui, Fuyuto

AU - Nakazawa, Satoru

AU - Watanabe, Sei ichiro

AU - Tsuda, Yuichi

PY - 2023/4/1

Y1 - 2023/4/1

N2 - We have investigated several particles collected during each of two touchdowns of the Hayabusa2 spacecraft at the surface of the C-type asteroid 162173 Ryugu using various electron microscope techniques. Our detailed transmission electron microscopy study shows the presence of magnetite with various morphologies coexisting in close proximity. This is characteristic of CI chondrite-like materials and consistent with the mineral assemblages and compositions in the Ryugu parent body. We describe the microstructural characteristics of magnetite with different morphologies, which could have resulted from the chemical conditions (growth vs. diffusion rate) during their formation. Furthermore, we describe the presence of magnetites with a spherulitic structure composed of individual radiating fibers that are characterized by pervasive, homogeneously distributed euhedral to subhedral pores that have not been described in previous chondrite studies. This particular spherulitic structure is consistent with crystallization under nonequilibrium conditions. Additionally, the presence of a high density of defects within the magnetite fibers, the high surface/volume ratio of this morphology, and the presence of amorphous materials in several pores and at the edges of the acicular fibers further support their formation under nonequilibrium conditions. We suggest that the growth processes that lead to this structure result from the solution reaching a supersaturated state, resulting in an adjustment to a lower free energy condition via nucleation and rapid growth.

AB - We have investigated several particles collected during each of two touchdowns of the Hayabusa2 spacecraft at the surface of the C-type asteroid 162173 Ryugu using various electron microscope techniques. Our detailed transmission electron microscopy study shows the presence of magnetite with various morphologies coexisting in close proximity. This is characteristic of CI chondrite-like materials and consistent with the mineral assemblages and compositions in the Ryugu parent body. We describe the microstructural characteristics of magnetite with different morphologies, which could have resulted from the chemical conditions (growth vs. diffusion rate) during their formation. Furthermore, we describe the presence of magnetites with a spherulitic structure composed of individual radiating fibers that are characterized by pervasive, homogeneously distributed euhedral to subhedral pores that have not been described in previous chondrite studies. This particular spherulitic structure is consistent with crystallization under nonequilibrium conditions. Additionally, the presence of a high density of defects within the magnetite fibers, the high surface/volume ratio of this morphology, and the presence of amorphous materials in several pores and at the edges of the acicular fibers further support their formation under nonequilibrium conditions. We suggest that the growth processes that lead to this structure result from the solution reaching a supersaturated state, resulting in an adjustment to a lower free energy condition via nucleation and rapid growth.

KW - Aqueous alteration

KW - Magnetite

KW - Nonequilibrium

KW - Return samples

KW - Ryugu

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UR - http://www.scopus.com/inward/citedby.url?scp=85147935804&partnerID=8YFLogxK

U2 - 10.1016/j.gca.2023.02.003

DO - 10.1016/j.gca.2023.02.003

M3 - Article

AN - SCOPUS:85147935804

SN - 0016-7037

VL - 346

SP - 65

EP - 75

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

ER -

Nonequilibrium spherulitic magnetite in the Ryugu samples

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