TY - JOUR
T1 - Development of preparation methods of polished sections of returned samples from asteroid Ryugu by the Hayabusa2 spacecraft
AU - Nakashima, Daisuke
AU - Fujioka, Yuri
AU - Katayama, Kanchi
AU - Morita, Tomoyo
AU - Kikuiri, Mizuha
AU - Amano, Kana
AU - Kagawa, Eiichi
AU - Nakamura, Tomoki
N1 - Publisher Copyright:
© 2023 The Meteoritical Society.
PY - 2024/8
Y1 - 2024/8
N2 - Preparation procedures of polished sections of the Ryugu samples returned by the Hayabusa2 spacecraft were established through tests using CI and CM chondrites as analog materials of the Ryugu samples and processing of the Ryugu samples. The procedures consisted of four steps: epoxy-coating, embedding in epoxy cylinders, cutting with a wire saw, and dry polish by hand. There are three key points for successful preparation of the polished sections: (1) ethanol-mixed epoxy with low viscosity for reinforcing the fragile samples, (2) handling under dry conditions to avoid breakup of the samples on contact with liquids due to their highly porous nature, and (3) X-ray computed tomography data for exposing maximum surface areas of target mineral phases and clasts. These key points may also be important for processing of samples returned from asteroid Bennu and the Martian Moon Phobos, as those samples are likely to be hydrous carbonaceous chondrite-like materials. The established procedures induce two side effects: zoning of the polished surface of the Ryugu samples in scanning electron microscope images reflecting differences in carbon contents due to permeation of low viscosity epoxy resin into the sample surface and fractures in anhydrous minerals possibly due to shear stress during dry polishing.
AB - Preparation procedures of polished sections of the Ryugu samples returned by the Hayabusa2 spacecraft were established through tests using CI and CM chondrites as analog materials of the Ryugu samples and processing of the Ryugu samples. The procedures consisted of four steps: epoxy-coating, embedding in epoxy cylinders, cutting with a wire saw, and dry polish by hand. There are three key points for successful preparation of the polished sections: (1) ethanol-mixed epoxy with low viscosity for reinforcing the fragile samples, (2) handling under dry conditions to avoid breakup of the samples on contact with liquids due to their highly porous nature, and (3) X-ray computed tomography data for exposing maximum surface areas of target mineral phases and clasts. These key points may also be important for processing of samples returned from asteroid Bennu and the Martian Moon Phobos, as those samples are likely to be hydrous carbonaceous chondrite-like materials. The established procedures induce two side effects: zoning of the polished surface of the Ryugu samples in scanning electron microscope images reflecting differences in carbon contents due to permeation of low viscosity epoxy resin into the sample surface and fractures in anhydrous minerals possibly due to shear stress during dry polishing.
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U2 - 10.1111/maps.14036
DO - 10.1111/maps.14036
M3 - Article
AN - SCOPUS:85164106205
SN - 1086-9379
VL - 59
SP - 1829
EP - 1844
JO - Meteoritics and Planetary Science
JF - Meteoritics and Planetary Science
IS - 8
ER -