Development of a method for quantitatively constraining the thermal history of meteorites using silica minerals

• Project/Area Number: 20K22370
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0204:Astronomy, earth and planetary science, and related fields
• Research Institution: Chiba Institute of Technology
• Principal Investigator: Ono Haruka 千葉工業大学, 附属研究所, 研究員 (10880320)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 隕石 / シリカ鉱物 / メソシデライト / 冷却速度 / 熱史 / 熱史推定 / 新しい指標

Outline of Research at the Start

近年、シリカ鉱物は様々な隕石中で発見され、熱史の推定に用いられようとしている。しかし、形成条件や相転移条件、相転移速度など、未だ定量的に明らかになっていないことが多く、議論は難化している。そこで、本研究では、シリカ鉱物の多形と低温の冷却速度が定量的に見積もることができるFe-Niメタルが共存するメソシデライト隕石を用いて、シリカ鉱物多形間の相転移速度を定量的に制約する。これにより、シリカ鉱物を熱史推定の新たな指標として確立し、これまで議論が困難であった石質隕石の低温熱史を明らかにすることができる。

Outline of Final Research Achievements

In this study, we attempted to establish a new estimation method using silica minerals by analyzing silica minerals in the stony-iron meteorite mesosiderite in detail to determine the cooling rate in the low-temperature region, which had previously been estimated only using iron-nickel zoning. The analysis results suggest that the cooling rate of the phase transition from cristobalite to tridymite is less than 0.003-0.01°C/day. Continuation of this study is expected to provide a detailed thermal history of stony meteorites that do not contain much metal, for which low-temperature cooling rates have not been estimated.

Academic Significance and Societal Importance of the Research Achievements

隕石の冷却速度などの熱史は、これまで輝石や金属鉄などを用いて見積もられてきた。しかし、それらが示す熱史は限られた温度領域に限定されている。本研究では、高温から低温まで幅広い温度領域において、数多くの多形（形態）を持つシリカ鉱物に着目した。輝石と金属鉄両方を含むメソシデライト隕石中のシリカ鉱物を詳細に分析することで、シリカ鉱物が850-400℃以下までの冷却速度を示す新しい指標になりうることを明らかにした。

Research Products

• [Journal Article] Measuring the shock stage of Itokawa and asteroid regolith grains by electron backscattered diffraction, optical petrography, and synchrotron X‐ray diffraction (2022)
  • Author(s): Zolensky Michael、Martinez James、Sitzman Scott、Mikouchi Takashi、Hagiya Kenji、Ohsumi Kazumasa、Komatsu Mutsumi、Nakamura Tomoki、Takenouchi Atsushi、Ono Haruka、et al.
  • Journal Title: Meteoritics & Planetary Science Volume: 57 Issue: 5 Pages: 1060-1078
  • DOI: 10.1111/maps.13808
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Association of silica phases as geothermobarometer for eucrites: Implication for two‐stage thermal metamorphism in the eucritic crust (2021)
  • Author(s): Ono Haruka、Takenouchi Atsushi、Mikouchi Takashi、Yamaguchi Akira、Yasutake Masahiro、Miyake Akira、Tsuchiyama Akira、Righter Kevin
  • Journal Title: Meteoritics & Planetary Science Volume: 56 Issue: 6 Pages: 1086-1108
  • DOI: 10.1111/maps.13664
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evidence for early asteroidal collisions prior to 4.15 Ga from basaltic eucrite phosphate U-Pb chronology (2020)
  • Author(s): Koike Mizuho、Sano Yuji、Takahata Naoto、Iizuka Tsuyoshi、Ono Haruka、Mikouchi Takashi
  • Journal Title: Earth and Planetary Science Letters Volume: 549 Pages: 116497-116497
  • DOI: 10.1016/j.epsl.2020.116497
  • Peer Reviewed / Open Access
• [Presentation] Shock Recovery of Granite with a Decaying Shock Wave: Fragmentation, Formation of Stishovite, and Onset of Melting at Low (< 20 GPa) Shock Pressure (2022)
  • Author(s): C Hamann, K Kurosawa, FED Kaufmann, H Ono, T Tada, T Niihara, T Okamoto, T Matsui
  • Organizer: 53rd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Shock Effects in Pre-Heated Basalt: Search for the Criteria for Producing Mosaicism (2022)
  • Author(s): H Ono, K Kurosawa, T Niihara, T Mikouchi, N Tomioka, T Okamoto, T Matsui
  • Organizer: 53rd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Shock Recovery of Granite with a Decaying Shock Wave: Feather Features Formation in Quartz (2022)
  • Author(s): T Tada, K Kurosawa, H Ono, C Hamann, T Okamoto, T Niihara, T Matsui
  • Organizer: 53rd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Shock recovery of rocks with a variety of shock-induced pressure at a single shot (2022)
  • Author(s): Haruka Ono, Kousuke Kurosawa, Takafumi Niihara, Takashi Mikouchi, Hidenori Genda, Naotaka Tomioka, Tatsuhiro Sakaiya, Tadashi Koundo, Masahiro Kayama, Mizuho Koike, Yuji Sano, Wataru Satake, Takafumi Matsui
  • Organizer: Europlanet Science Congress 2021
  • Int'l Joint Research
• [Presentation] Silica Minerals in Northwest Africa 1878 Mesosiderite (2021)
  • Author(s): H Ono, A Takenouchi, T Mikouchi, A Yamaguchi, N Sugiura
  • Organizer: 84th Annual Meeting of The Meteoritical Society 2021
  • Int'l Joint Research
• [Presentation] Shock Recovery of Macro Blocks of Rocky Materials with Decaying Shock Waves (2021)
  • Author(s): K Kurosawa, H Ono, T Niihara, T Mikouchi, T Sakaiya, T Kondo, N Tomioka, H Genda, T Tada, R Tada, M Kayama, M Koike, Y Sano, T Matsuzaki, M Murayama, W Satake, T Okamoto, T Matsui
  • Organizer: 84th Annual Meeting of The Meteoritical Society 2021
  • Int'l Joint Research
• [Presentation] 数値衝突計算を用いた3次元衝撃回収実験試料の経験温度圧力推定 (2021)
  • Author(s): 大野遼, 黒澤耕介, 新原隆史, 三河内岳, 玄田英典, 富岡尚敬, 鹿山雅弘, 小池みずほ, 佐野有司, 佐竹渉, 松井孝典
  • Organizer: CfCA users meeting
• [Presentation] Shock Metamorphism in a Quasi-Open System I: Undulatory Extinction in Calcite (CaCO3) (2021)
  • Author(s): Kurosawa K., Ono H., Niihara T., Mikouchi T., Tomioka N., Genda H., Sakaiya T., Kondo T., Kayama M., Koike M., Sano Y., Satake W. and Matsui T.
  • Organizer: Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Shock Metamorphism in a Quasi-Open System II: Melt Veins in Basalt at Shock Stage 2 (2021)
  • Author(s): Ono H., Kurosawa K., Niihara T., Mikouchi T., Genda H., Tomioka N., Kayama M., Koike M., Sano Y., Satake W. and Matsui T.
  • Organizer: Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Argon-Argon Chronology of Two Shocked Eucrites, Northwest Africa 1000 and Yamato 980433 (2021)
  • Author(s): Takenouchi A., Sumino H., Mikouchi T., Ono H. and Yamaguchi A.
  • Organizer: Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] ユークライト隕石中シリカ鉱物が示すユークライト質地殻の2段階熱変成履歴 (2020)
  • Author(s): 大野遼, 三河内, 岳, 山口亮
  • Organizer: 日本鉱物科学会
• [Presentation] 衝撃変成時の塑性変形加熱効果の実証に向けた3次元衝突回収実験 (2020)
  • Author(s): 新原隆史, 黒澤耕介, 大野遼, 佐竹渉, 鹿山雅裕, 小池みずほ, 玄田英典, 三河内岳, 佐野有司, 松井孝典
  • Organizer: 日本鉱物科学会
• [Presentation] 3次元衝撃回収実験によるコンドライト隕石の衝撃変成度の見直しに向けて (2020)
  • Author(s): 大野遼, 黒澤耕介, 新原隆史, 三河内岳, 玄田英典, 鹿山雅裕, 小池みずほ, 富岡尚敬, 佐野有司, 佐竹渉, 松井孝典
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] 粉体衝突実験における衝突直下点物質の回収 (2020)
  • Author(s): 黒澤耕介, 大野遼, 佐藤雅彦, 新原隆史, 長谷川直, 佐竹渉, 松井孝典
  • Organizer: 日本惑星科学会秋季講演会