Japan Geoscience Union Meeting 2015

Presentation information


Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS21] Planetary Sciences

Mon. May 25, 2015 11:00 AM - 12:45 PM A02 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Kosuke Kurosawa(Planetary Exploration Research Center, Chiba Institute of Technology), Keiko Hamano(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Chair:Shunichi Kamata(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Shintaro Azuma(Department of Earth and Planetary Sciences System,Hiroshima university)

11:45 AM - 12:00 PM

[PPS21-36] Development of an in-situ dating package for lunar/Mars missions

*Yuichiro CHO1, Kazuo SHIBASAKI1, Misako UMEYAMA1, Takahiro OISHI2, Shingo KAMEDA1, N., Yayoi MIURA3, Kazuo YOSHIOKA2, Yoshifumi SAITO2, Shoichiro YOKOTA2, Satoshi KASAHARA2, Tetsuo YOSHIMITSU2, Ryuji OKAZAKI4, Makiko OHTAKE2, Tomokatsu MOROTA5, Sumire KOGA6, Seiji SUGITA7 (1.Rikkyo University, 2.ISAS, 3.Earthquake Research Institute, University of Tokyo, 4.Kyushu University, 5.Nagoya University, 6.Dept. Complexity Science and Engineering, University of Tokyo, 7.Dept. Earth and Planetary Science, University of Tokyo)

Age data of geologic records on the Moon and Mars will significantly improve our understanding of their evolution. We have been developing an in-situ K-Ar dating instrument and conducted a series of experiments to demonstrate its principle. In this presentation, we report the recent progress in the engineering aspect of our instrument.
First, we have established the design of our instrument package and the procedure of age measurements. Second, we have designed a sample handling system using parallel link motion. Third, we conducted blank measurements using the noble-gas analysis system we built previously, in order to investigate the capability of O-rings as seal materials. We used Viton and Nexus-SLT O-rings instead of metal gaskets. Our results indicate that a metal seal can be replaced with sufficiently baked Viton O-rings in the lunar environment because there is no atmosphere permeating through the O-ring. Our experimental results also indicate that under the pressure of Martian atmosphere (i.e., 6 hPa), a sufficiently low blank level can be achieved by using a double O-ring evacuating system. Above-described developments enhance the technical feasibility of our in-situ geochronology instrument.