Development of an in-situ K-Ar dating method toward understanding of the early evolution of the solar system bodies

• Project/Area Number: 26887040
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Rikkyo University
• Principal Investigator: CHO Yuichiro 立教大学, 理学部, ポストドクトラルフェロー (00737687)
• Project Period (FY): 2014-08-29 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: カリウム・アルゴン年代 / 惑星探査 / LIBS / 発光分光 / 定量分析

Outline of Final Research Achievements

We explored the capability of K measurements using a combination of a small, low-energy laser and a high-resolution spectrometer. We found that the K emission lines can be detected from a sample with 300 ppm K2O content when the laser pulse energy was >20 mJ. We obtained the calibration lines for the pulse energy of 20, 30, and 35 mJ. The corresponding detection limits were 2 wt%, 9300 ppm, and 5100 ppm, respectively. We also achieved the relative accuracy better than 20% for a sample with K2O > 1.8 wt%, when the laser pulse energy was > 20 mJ.

Research Products

• [Journal Article] High-precision potassium measurements using laser-induced breakdown spectroscopy under high vacuum conditions for in situ K-Ar dating of planetary surfaces (2015)
  • Author(s): Y. Cho, S. Sugita, S. Kameda, Y. N. Miura, K. Ishibashi, S. Ohno, S. Kamata, T. Arai, T. Morota, N. Namiki, T. Matsui
  • Journal Title: Spectrochimica Acta Part B Volume: 106 Pages: 28-35
  • DOI: 10.1016/j.sab.2015.02.002
  • Peer Reviewed / Open Access
• [Journal Article] An outlook of <i>in-situ</i> geochronology techniques for planetary explorations (2014)
  • Author(s): 長勇一郎, 三浦弥生, 亀田真吾, 岡崎隆司, 諸田智克, 杉田精司
  • Journal Title: Chikyukagaku Volume: 48 Issue: 4 Pages: 231-243
  • DOI: 10.14934/chikyukagaku.48.231
  • NAID: 130005057003
  • ISSN: 0386-4073, 2188-5923
  • Peer Reviewed / Open Access
• [Presentation] An In-situ Dating Instrument Package for a Future Mars Rover Mission (2015)
  • Author(s): Yuichiro Cho, Shingo Kameda, Yayoi N. Miura, Yoshifumi Saito, Shoichiro Yokota, Satoshi Kasahara, Ryuji Okazaki, Kazuo Yoshioka, Kazuo Shibasaki, Takahiro Oishi, Misako Umeyama, Seiji Sugita.
  • Organizer: 30th International Symposium on Space Technology and Science
  • Place of Presentation: Kobe International Conference Center, Kobe, Hyogo, Japan
  • Year and Date: 2015-07-09
• [Presentation] 月惑星探査における年代その場計測を目指した開発 (2015)
  • Author(s): 長 勇一郎, 芝崎 和夫, 梅山 未紗子, 大石 峻裕, 亀田 真吾, 三浦 弥生, 吉岡 和夫, 齋藤 義文, 横田 勝一郎, 笠原 慧, 吉光 徹雄, 岡崎 隆司, 大竹 真紀子, 諸田 智克, 古賀 すみれ, 杉田 精司
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県・千葉市)
  • Year and Date: 2015-05-25
• [Presentation] 年代計測装置CHRONICLEによる火星表面年代のその場計測 (2015)
  • Author(s): 長 勇一郎, 亀田真吾, 三浦弥生, 齋藤義文, 横田勝一郎, 笠原慧, 岡崎隆司, 吉岡和夫, 芝崎和夫, 梅山未紗子, 大石峻裕, 杉田精司
  • Organizer: 宇宙科学シンポジウム
  • Place of Presentation: 宇宙科学研究所（神奈川県・相模原市）
  • Year and Date: 2015-01-06
• [Presentation] 火星探査で岩石のK-Ar年代を測る (2014)
  • Author(s): 長勇一郎,三浦弥生,亀田真吾,岡崎隆司,杉田精司
  • Organizer: 質量分析学会同位体比部会
  • Place of Presentation: 彩香の宿 一望(茨城県・つくば市)
  • Year and Date: 2014-11-26
• [Presentation] An in-situ K-Ar isochron dating system for a Mars rover mission (2014)
  • Author(s): Y. Cho, S. Kameda, Y. N. Miura, H. Miyamoto, S. Sugita.
  • Organizer: International Workshop on Instrumentation for Planetary Missions
  • Place of Presentation: Goddard Space Flight Center, Maryland, USA
  • Year and Date: 2014-11-05