High-velocity impact of micrometeorites: implication for evolution of asteroid regolith

• Project/Area Number: 26800235
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Okayama University
• Principal Investigator: Shimaki Yuri 岡山大学, 惑星物質研究所, 助手 (60710548)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 衝撃変成 / クレーター / 普通コンドライト / 小惑星 / 二段式軽ガス銃 / 衝突クレーター

Outline of Final Research Achievements

We carried out high-velocity impact-experiments of metal and silicate projectile into regolith of silicates including ordinary chondrites by vertical and horizontal two-stage light-gas-gun in the Institute of Space and Astronautical Science to examine crater formation process and physicochemical evolution of regolith on asteroid surface. A new vacuum impregnation system for embedding crater on regolith was developed. Impact products distribute at depth of two times of projectile diameter from surface. Impact melt consists of sub-micron silicates and metal spherules with trace-element abundance similar to bulk composition.

Research Products

• [Presentation] 衝突による普通コンドライトの物理化学進化に関する研究 (2017)
  • Author(s): 嶌生有理
  • Organizer: 平成 28 年度宇宙科学に関する室内実験シンポジウム
  • Place of Presentation: 宇宙科学研究所 (神奈川)
  • Year and Date: 2017-02-27
• [Presentation] Shock Metamorphism of Olivine Monolith and Regolith Impacted by Steel (2016)
  • Author(s): Shimaki, Y., Kunihiro, T., Suzuki, A. I., Hasegawa, S., and Nakamura, E.
  • Organizer: 47th Lunar and Planetary Science Conference
  • Place of Presentation: The Woodlands, Texas, USA
  • Year and Date: 2016-03-21
  • Int'l Joint Research
• [Presentation] Experimental study on shock metamorphism of silicate regolith (2016)
  • Author(s): Shimaki, Y., Kunihiro, T., Suzuki, A. I., Hasegawa, S., and Nakamura, E.
  • Organizer: Misasa International Symposium 2016 (Misasa VI)
  • Place of Presentation: BlancArt Misasa, Tottori, Japan
  • Year and Date: 2016-03-08
  • Int'l Joint Research
• [Presentation] Voyage of the Chelyabinsk meteorite aboard an icy comet host, from the asteroid belt to near-Earth orbit (2016)
  • Author(s): Nakamura, E., Kunihiro, T., Kitagawa, H., Kobayashi, K., Ota, T., Sakaguchi, C., Shimaki, Y., Tanaka, R., Tsujimori, T., Yamanaka, M., Bebout, G. E., Grokhovsky, V. I., Koroleva, O. N., Litasov, K. D., and Malkovets, V.
  • Organizer: Misasa International Symposium 2016 (Misasa VI)
  • Place of Presentation: BlancArt Misasa, Tottori, Japan
  • Year and Date: 2016-03-08
  • Int'l Joint Research
• [Presentation] The mineralogy of the Chelyabinsk meteorite ~ Implication from micro to nano-scale geochemical reservoirs ~ (2016)
  • Author(s): Kobayashi, K., Ota, T., Shimaki, Y., Tsujimori, T., Kunihiro, T., Kitagawa, H., Sakaguchi, C., Tanaka, R., Yamanaka, M., Bebout, G. E., Grokhovsky, V. I., Koroleva, O. N., Litasov, K. D., Malkovets, V., and Nakamura, E.
  • Organizer: Misasa International Symposium 2016 (Misasa VI)
  • Place of Presentation: BlancArt Misasa, Tottori, Japan
  • Year and Date: 2016-03-08
  • Int'l Joint Research
• [Presentation] 衝突による普通コンドライトの物理化学進化に関する研究 (2016)
  • Author(s): 嶌生有理，国広卓也，長谷川直，鈴木絢子，中村栄三
  • Organizer: 平成 27 年宇宙科学に関する室内実験シンポジウム
  • Place of Presentation: 宇宙科学研究所，神奈川
  • Year and Date: 2016-02-23
• [Presentation] Lithium in UHP Metasedimentary Garnets from Lago di Cignana, Italy: Coupled Substitutions and the Role of Accessory Phases (2015)
  • Author(s): Bebout, G. E., Tsujimori, T., Ota, T., Shimaki, Y., Kunihiro, T., Carlson, W. D., and Nakamura, E.
  • Organizer: Geological Society of America Annual Meeting
  • Place of Presentation: Baltimore, Maryland, USA
  • Year and Date: 2015-11-01
  • Int'l Joint Research
• [Presentation] Experimental Study on Physicochemichal Evolution of Olivine by High-Velocity Impact (2015)
  • Author(s): 嶌生有理
  • Organizer: 国際シンポジウム Misasa V
  • Place of Presentation: プランナール三朝 (鳥取県)
  • Year and Date: 2015-03-06 – 2015-03-08
• [Presentation] 衝突による普通コンドライトの物理化学進化に関する研究 (2015)
  • Author(s): 嶌生有理
  • Organizer: 宇宙科学に関する室内実験シンポジウム
  • Place of Presentation: 宇宙科学研究所 (神奈川県)
  • Year and Date: 2015-02-23 – 2015-02-24