2026 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
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Session Details

Oral presentationR5: Extraterrestrial materials

R5: Extraterrestrial materials

Thu. Sep 24, 2026 9:30 AM - 11:45 AM JST
Thu. Sep 24, 2026 12:30 AM - 2:45 AM UTC
Room C (287)
Chairperson:Megumi Matsumoto, Toru Matsumoto(Kyoto University), Daiki Yamamoto(Kyushu University)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[R5-01]Redox conditions during the early formation of the Moon as revealed by plagioclase in anorthositic lunar meteorites

*Takashi MIKOUCHI1, Wataru Satake2, Haruto Sasaki3, Sojiro Yamazaki3, Rikuto Honda3, Akiko Ishii3, Ryo Machida3, Yokoi Nina3, Atsushi Takenouchi4 (1. Univ. Tokyo, Univ. Museum , 2. Chiba Tech., Inst. Geo-Cos., 3. Univ. Tokyo, Sci., 4. Kyoto Univ., Univ. Museum)
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)Student Presentation Award Entry

[R5-02]Constraints on the Moon’s Early Internal Structure and Evolution Timescale Based on a Lunar Magma Ocean Crystallization Model Incorporating Fractional Crystallization and the 146,147Sm–142,143Nd Isotopic Systems

*Sojiro YAMAZAKI1, Takashi Mikouchi1,2 (1. Fac. Sci., Univ. Tokyo, 2. Univ. Museum, Univ. Tokyo)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[R5-03]High-pressure decomposition textures of fayalite in the lunar meteorite Asuka 881757

*Masaaki MIYAHARA1, Akira Yamaguchi2, Naotaka Tomioka3, Takaaki Kawazoe1 (1. Hiroshima University, 2. NIPR, 3. JAMSTEC)
10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[R5-04]Evaluation of Structural Models for Monoclinic Tridymite for Structural Analysis of Tridymite in Meteorites

*Haruka OONO1, Takahiro Kuribayashi2, Jo Tsuzuki1, Yohei Igami1, Akira Miyake1 (1. Kyoto Univ., 2. Tohoku Univ.)
10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[R5-05]Stability of chenmingite lamellae in Martian meteorites during post-shock heating

*Atsushi TAKENOUCHI1, Yohei Igami2, Akira Miyake2, Takashi Mikouchi3, Akira Yamaguchi4 (1. Kyoto Univ. Mus., 2. Kyoto Univ. Sci., 3. Tokyo Univ. Mus., 4. NIPR)
10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)Student Presentation Award Entry

[R5-06]Petrological and Mineralogical Study of the Martian Meteorite Northeast Africa 053: Insights into Its Crystallization Process from Multiple Lithologies

*Ryo Machida1, Takashi Mikouchi2 (1. Univ. Tokyo Sci., 2. Univ. Tokyo Univ. Muse.)
11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)Student Presentation Award Entry

[R5-07]Diversity of Formation Processes in Nakhlite Martian Meteorites: Insights from Petrographic and Mineralogical Characteristics

*Akiko Ishii1, Takashi Mikouchi1,2, Ryo Yamaguchi3 (1. Tokyo Univ. Sci., 2. Tokyo Univ. Mus., 3. NIPR)
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)Student Presentation Award Entry

[R5-08]Petrogenesis of spinel xenocrysts in quenched angrites: Implications for the mantle of the angrite parent body

*Rikuto Honda1, Hideyuki Hayashi2, Atsushi Takenouchi3, Akira Yamaguchi4, Takashi Mikouchi5 (1. Fac. Sci., Univ. Tokyo, 2. Natl. Museum of Nature and Sci., 3. The Kyoto Univ. Museum, 4. Natl. Inst. of Polar Res., 5. Univ. Museum, Univ. Tokyo)
11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[R5-09]Unique petrology of the quenched angrite NWA 18087

*Hideyuki HAYASHI1, Rikuto HONDA2, Takashi Mikouchi3 (1. Natl. Museum of Nature and Sci., 2. Fac. Sci., Univ. Tokyo, 3. Univ. Museum, Univ. Tokyo)
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