R5: Extraterrestrial materials

[R5-05] An Antarctic micrometeorirte as a microbreccia of CP IDP and CS IDP-like material

*Takaaki Noguchi¹, Rikako Matsumoto^2,3, Hikaru Yabuta⁴, Hanae Kobayashi⁹, Akira Miyake¹, Hiroshi Naraoka², Ryuji Okazaki², Naoya Imae⁵, Akira Yamaguchi⁵, David Kylcoyne⁶, Shohei Yamashita⁷, Yoshio Takahashi⁸ (1. Kyoto Univ. Sci., 2. Kyushu Univ. Sci., 3. Ine Town Hall, 4. Hiroshima Univ. Sci., 5. NIPR, 6. ALS, 7. KEK, 8. Univ. Tokyo Sci., 9. Nihon Therm. Consult.)

Keywords:CP IDP, CS IDP, AMM

We report on an Antarctic micrometeorite (AMM) with lithologies comparable to the CP and CS IDPs (hereafter porous and compact lithologies). Both lithologies contact with sharp boundaries. The SFT number density of olivine is in the range of IDPs from trans-Neptunian objects. The similarity of the structure of the organic matter in them suggests that the compact lithology was formed from porous lithology. The AMM is most likely a microbreccia formed in the regolith composed of both lithologies.