TY - JOUR
T1 - Iron and copper sulfides in asteroid (162173) Ryugu
T2 - Formation conditions and a comparison to the CI and CY chondrites
AU - Harrison, C. S.
AU - King, A. J.
AU - Jones, R. H.
AU - Russell, S. S.
AU - Nakamura, T.
AU - Yurimoto, H.
AU - Noguchi, Takaaki
AU - Okazaki, R.
AU - Yabuta, H.
AU - Naraoka, H.
AU - Sakamoto, K.
AU - Tachibana, S.
AU - Yada, T.
AU - Nishimura, M.
AU - Nakato, A.
AU - Miyazaki, A.
AU - Yogata, K.
AU - Abe, M.
AU - Okada, T.
AU - Usui, T.
AU - Yoshikawa, M.
AU - Saiki, T.
AU - Tanaka, S.
AU - Terui, F.
AU - Nakazawa, S.
AU - Watanabe, S.
AU - Tsuda, Y.
N1 - Publisher Copyright:
© 2025 The Author(s). Meteoritics & Planetary Science published by Wiley Periodicals LLC on behalf of The Meteoritical Society.
PY - 2025/3
Y1 - 2025/3
N2 - JAXA's Hayabusa2 sample return mission visited the volatile-rich carbonaceous (C-type) asteroid (162173) Ryugu with the aim of ground-truthing remote observations, returning a pristine sample from a C-type asteroid, and strengthening links between asteroids and the meteorite collection. Here, we have conducted a systematic study of coarse (>10 μm) sulfide grains in Ryugu particles C0025-01 and C0103-02, the CI chondrites Orgueil and Ivuna, and the CY chondrites Y-86029 (Stage III, heated to 500–750°C) and Y-86720 (Stage IV, >750°C), using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Sulfides are sensitive tracers of secondary alteration conditions, and we find that Ryugu and the CI chondrites share a distinct sulfide assemblage that includes the iron sulfides pyrrhotite and pentlandite, and the copper sulfide cubanite, that equilibrated during periods of low temperature (~25°C) aqueous alteration. Sulfides in the CY chondrites are compositionally distinct from Ryugu and the CI chondrites as a result of post-hydration heating. However, the occurrence of Cu-rich sulfides in Ryugu, the CIs, and the CYs suggests a genetic relationship between these samples.
AB - JAXA's Hayabusa2 sample return mission visited the volatile-rich carbonaceous (C-type) asteroid (162173) Ryugu with the aim of ground-truthing remote observations, returning a pristine sample from a C-type asteroid, and strengthening links between asteroids and the meteorite collection. Here, we have conducted a systematic study of coarse (>10 μm) sulfide grains in Ryugu particles C0025-01 and C0103-02, the CI chondrites Orgueil and Ivuna, and the CY chondrites Y-86029 (Stage III, heated to 500–750°C) and Y-86720 (Stage IV, >750°C), using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Sulfides are sensitive tracers of secondary alteration conditions, and we find that Ryugu and the CI chondrites share a distinct sulfide assemblage that includes the iron sulfides pyrrhotite and pentlandite, and the copper sulfide cubanite, that equilibrated during periods of low temperature (~25°C) aqueous alteration. Sulfides in the CY chondrites are compositionally distinct from Ryugu and the CI chondrites as a result of post-hydration heating. However, the occurrence of Cu-rich sulfides in Ryugu, the CIs, and the CYs suggests a genetic relationship between these samples.
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U2 - 10.1111/maps.14312
DO - 10.1111/maps.14312
M3 - Article
AN - SCOPUS:105001059170
SN - 1086-9379
VL - 60
SP - 506
EP - 528
JO - Meteoritics and Planetary Science
JF - Meteoritics and Planetary Science
IS - 3
ER -