Incipient space weathering on asteroid 162173 Ryugu recorded by pyrrhotite [* Cross-Reference *]

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Harries, Dennis; Matsumoto, Toru; Langenhorst, Falko; Noguchi, Takaaki; Miyake, Akira; Igami, Yohei; Haruta, Mitsutaka; Seto, Yusuke; Miyahara, Masaaki; Tomioka, Naotaka; Saito, Hikaru; Hata, Satoshi; Takigawa, Aki; Nakauchi, Yusuke; Tachibana, Shogo; Nakamura, Tomoki; Matsumoto, Megumi; Ishii, Hope A.; Bradley, John P.; Ohtaki, Kenta; Dobrică, Elena; Leroux, Hugues; Le Guillou, Corentin; Jacob, Damien; de la Peña, Francisco; Laforet, Sylvain; Mouloud, Bahae eddine; Marinova, Maya; Beck, Pierre; Phan, Van T.H.; 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; Michikami, Tatsuhiro; Yurimoto, Hisayoshi; Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Yada, Toru; Nishimura, Masahiro; Nakato, Aiko; Miyazaki, Akiko; Yogata, Kasumi; Abe, Masanao; Okada, Tatsuaki; Usui, Tomohiro; Yoshikawa, Makoto; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Nakazawa, Satoru; Watanabe, Sei ichiro; Tsuda, Yuichi, 2024, "Incipient space weathering on asteroid 162173 Ryugu recorded by pyrrhotite [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.UP4UCO, LIST Open Repository, V1
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Description
Regolith samples returned from asteroid 162173 Ryugu by the Hayabusa2 mission provide direct means to study how space weathering operates on the surfaces of hydrous asteroids. The mechanisms of space weathering, its effects on mineral surfaces, and the characteristic time scales on which alteration occurs are central to understanding the spectroscopic properties and the taxonomy of asteroids in the solar system. Here, we investigate the behavior of the iron monosulfides mineral pyrrhotite (Fe1−xS) at the earliest stages of space weathering. Using electron microscopy methods, we identified a partially exposed pyrrhotite crystal that morphologically shows evidence for mass loss due to exposure to solar wind ion irradiation. We find that crystallographic changes to the pyrrhotite can be related to sulfur loss from its space-exposed surface and the diffusive redistribution of resulting excess iron into the interior of the crystal. Diffusion profiles allow us to estimate an order of magnitude of the exposure time of a few thousand years consistent with previous estimates of space exposure. During this interval, the adjacent phyllosilicates did not acquire discernable damage, suggesting that they are less susceptible to alteration by ion irradiation than pyrrhotite. (2024-06-06)
***This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1111/maps.14176 for the original and latest version of the dataset and data downloads*** (2025-09-03)
Subject Earth and Environmental Sciences
Keyword Regolith samples returned, mission provide direct, space weathering operates, space weathering, Regolith samples
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