Microscopic slickenside as a record of weak shock metamorphism in the surface layer of asteroid Ryugu [* Cross-Reference *]

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Miyahara, Masaaki; Noguchi, Takaaki; Matsumoto, Toru; Tomioka, Naotaka; Miyake, Akira; Igami, Yohei; Seto, Yusuke; Haruta, Mitsutaka; Saito, Hikaru; Hata, Satoshi; Ishii, Hope A.; Bradley, John P.; Ohtaki, Kenta K.; Dobrică, Elena; Leroux, Hugues; Le Guillou, Corentin; Jacob, Damien; de la Peña, Francisco; Laforet, Sylvain; Mouloud, Bahae Eddine; Marinova, Maya; Langenhorst, Falko; Harries, Dennis; Beck, Pierre; Phan, Thi H.V.; Rebois, Rolando; Abreu, Neyda M.; Gray, Jennifer; Zega, Thomas; Zanetta, Pierre M.; Thompson, Michelle S.; Stroud, Rhonda; Burgess, Kate; Cymes, Brittany A.; Bridges, John C.; Hicks, Leon; Lee, Martin R.; Daly, Luke; Bland, Phil A.; Zolensky, Michael E.; Frank, David R.; Martinez, James; Tsuchiyama, Akira; Yasutake, Masahiro; Matsuno, Junya; Okumura, Shota; Mitsukawa, Itaru; Uesugi, Kentaro; Uesugi, Masayuki; Takeuchi, Akihisa; Sun, Mingqi; Enju, Satomi; Takigawa, Aki; Michikami, Tatsuhiro; Nakamura, Tomoki; Matsumoto, Megumi; Nakauchi, Yusuke; Abe, Masanao; Nakazawa, Satoru; Okada, Tatsuaki; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Yoshikawa, Makoto; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Usui, Tomohiro; Yada, Toru; Yurimoto, Hisayoshi; Nagashima, Kazuhide; Kawasaki, Noriyuki; Sakamotoa, Naoya; Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Tachibana, Shogo; Watanabe, Sei ichiro; Tsuda, Yuichi, 2025, "Microscopic slickenside as a record of weak shock metamorphism in the surface layer of asteroid Ryugu [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.Z13YDN, LIST Open Repository, V1
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The surface morphology of regolith grains from the C-type asteroid Ryugu was studied in search of evidence of impact events on the asteroid. Scanning electron microscopy revealed that ~8% of C0105-042 Ryugu grains have a smooth surface on one side of the grains. One of these grains has striated linear grooves (striations) on its smooth surface. Transmission electron microscopy of the grain showed that a porous fine-grained Mg-Fe phyllosilicate assemblage, which is the main component of Ryugu grains, is compacted near the smooth surface. The smooth surface with striations closely resembles a slickenside, a characteristic texture found in terrestrial fault rocks formed by shear deformation. There is no evidence of melting/decomposition in the Mg-Fe phyllosilicates near the smooth surface, indicating that the shear heating temperature is less than ~1100 K. Assuming that the average length of the striations corresponds to the minimum displacement of the micro-fault, the shock pressure recorded in the C0105-042 Ryugu grain is estimated to be <~4.5 GPa by a fault mechanics calculation. The shock pressures of C0105-042, together with those of C0014 (~2 GPa) and C0055 (>~3.9 GPa) in previous studies suggest that the impact velocities recorded in these grains are < ~0.89–1.63 km s−1. Based on the impact velocities, these grains may record an impact event that occurred when asteroid Ryugu was in the orbit in Main Belt. (2024-12-01)
***This publication has been automatically imported via Elsevier by LIST harvest scripts. Please refer to https://doi.org/10.1111/maps.14271 *** (2025-05-06)
Subject Earth and Environmental Sciences
Keyword Shock metamorphism, Asteroid Ryugu, Slickenside
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