Asteroid collision history on the Moon based on silica high-pressure polymorph

• Project/Area Number: 26800277
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Hiroshima University
• Principal Investigator: Miyahara Masaaki 広島大学, 理学研究科, 准教授 (90400241)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 月 / 隕石 / 高圧相 / アポロ試料 / シリカ / 衝撃変成 / 放射年代 / インパクト / リングウッダイト

Outline of Final Research Achievements

Asteroid collision history on the Moon was investigated using lunar surface rock samples (lunar meteorite, Apollo and Runa return samples) based on high-pressure science, mineralogy and isotope chronology. Lunar meteorite, Apollo and Runa return samples include several kinds of a high-pressure mineral besides shock-induced melting texture. Considering the stable pressure field of high-pressure minerals, shock pressure and impact speed were estimated 3-23 GPa and several km/second, respectively. We also tried to determine the impact ages using radio-isotopes.

Research Products

• [Journal Article] シリカ高圧相から探る月の天体衝突史 (2016)
  • Author(s): 宮原正明
  • Journal Title: ISOTOPE NEWS Volume: 742 Pages: 33-37
• [Journal Article] Discovery of stishovite in Apollo 15299 sample (2015)
  • Author(s): Kaneko S., Miyahara M., Ohtani E., Arai T., Hirao N,, Sato K.
  • Journal Title: American Mineralogist Volume: 100 Issue: 5-6 Pages: 1308-1311
  • DOI: 10.2138/am-2015-5290
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 赤外吸収分光法により検出される月隕石の水 (2016)
  • Author(s): 鹿山雅裕，中嶋悟，富岡尚敬，大谷栄治，瀬戸雄介，長岡央，三宅亮，小澤信，関根利守，宮原正明，留岡和重
  • Organizer: 日本惑星科学会
  • Place of Presentation: 岡山
  • Year and Date: 2016-09-12
• [Presentation] 危難の海から回収されたルナ24号レゴリス試料のキャラクタリゼーション (2016)
  • Author(s): 寺田健太郎, 橋口友実, 河井洋輔, 宮原正明
  • Organizer: 2016年日本地球科学連合大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2016-05-22
• [Presentation] 月面における水の起源と水源地: 物質科学的見地からの検討 (2016)
  • Author(s): 鹿山雅裕, 富岡尚敬, 大谷栄治, 中嶋 悟, 瀬戸雄介, 長岡央, Fagan Timothy, Gotze Jens, 三宅 亮, 小澤信, 関根利守, 宮原正明, 松本恵, 庄田直起, 留岡和重
  • Organizer: 2016年日本地球科学連合大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2016-05-22
• [Presentation] 月隕石に記録された水に富む月の上部マントル (2016)
  • Author(s): 鹿山雅裕, 中嶋悟, 富岡尚敬, 瀬戸雄介,大谷栄治, Fagan Timothy, 長岡央, 小澤 信, 関根利守, 宮原正明, 三宅亮, 福田 惇一, 留岡和重, 市村隼, 松本恵, 鈴木 康太, Gotze Jens
  • Organizer: 2016年日本地球科学連合大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2016-05-22
• [Presentation] 衝撃を受けた隕石からのコーザイト，スティショバイト及びザイファルタイトの発見 (2016)
  • Author(s): 宮原正明, 大谷栄治, 山口亮, 小澤信
  • Organizer: 隕石学会
  • Place of Presentation: ベルリン・ドイツ
  • Int'l Joint Research / Invited
• [Presentation] 衝撃を受けた天然のシリカ高圧相, (2016)
  • Author(s): 宮原正明, 大谷栄治
  • Organizer: 東北大学知のフォーラム
  • Place of Presentation: 仙台
  • Int'l Joint Research / Invited
• [Presentation] 高圧相から探る月起源隕石に記録された衝突史の解明 (2015)
  • Author(s): 宮原正明，大谷栄治，金子詳平．
  • Organizer: 第56回高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] High-pressure polymorphs of silica in shocked meteorites and their implications (2015)
  • Author(s): Miyahara M.
  • Organizer: Japan Geoscience Union Meeting 2015
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2015-05-24 – 2015-05-28
• [Presentation] High-pressure polymorphs of silica in shocked meteorites and their implications. (2015)
  • Author(s): Miyahara M
  • Organizer: Japan Geoscience Union meeting 2015
  • Place of Presentation: 幕張
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] Application of a FIB system to ultra-high-pressure Earth and planetary sciences (2015)
  • Author(s): Miyahara M., Ohtani E.
  • Organizer: New Frontier in Studying Chemistry under Extreme Conditions: Applications of FIB Technology
  • Place of Presentation: HPSTAR, 上海
  • Year and Date: 2015-05-21 – 2015-05-22
  • Invited
• [Presentation] Application of a FIB system to ultra-high-pressure Earth and planetary sciences (2015)
  • Author(s): Miyahara M. and Ohtani E.
  • Organizer: The 2015 “New Frontier in Studying Chemistry under Extreme Conditions: Applications of FIB (Focused ion beam) Technology” workshop
  • Place of Presentation: Shanghai, China
  • Year and Date: 2015-05-21
  • Int'l Joint Research / Invited