The Solar System calcium isotopic composition inferred from Ryugu samples

The Solar System calcium isotopic composition inferred from Ryugu samples

The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) Ryugu to Earth. Previous petrological and chemical analyses support a close link between Ryugu and CI chondrites that are presumed to be chemically the most primitive meteorites with a solar-like composition. However, R...

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Published in:Geochemical perspectives letters Vol. 24; no. N/A
Main Authors: Moynier, F., Dai, W., Yokoyama, T., Hu, Y., Paquet, M., Abe, Y., Aléon, J., Alexander, C. M.O'D, Amari, S., Amelin, Y., Bajo, K. -I., Bizzarro, M., Bouvier, A., Carlson, R. W., Chaussidon, M., Choi, B. -G., Dauphas, N., Davis, A. M., Di Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M. K., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G. R., Ichida, K., Iizuka, T., Ireland, T. R., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N. T., Kitajima, K., Kleine, T., Komatani, S., Krot, A. N., Liu, M. -C., Masuda, Y., McKeegan, K. D., Morita, M., Motomura, K., Nakai, I., Nagashima, K., Nesvorný, D., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S. S., Sakamoto, N., Schönbächler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R. J., Yamashita, K., Yin, Q. -Z., Yoneda, S., Young, E. D., Yui, H., Zhang, A. -C., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Abe, M., Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Yada, T., Yogata, K., Nakazawa, S., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S. -I., Yoshikawa, M., Tachibana, S., Yurimoto, H.
Format: Journal Article
Language:English
Published: United States European Association of Geochemistry 01-10-2022
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ASTRONOMY AND ASTROPHYSICS
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Abstract The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) Ryugu to Earth. Previous petrological and chemical analyses support a close link between Ryugu and CI chondrites that are presumed to be chemically the most primitive meteorites with a solar-like composition. However, Ryugu samples are highly enriched in Ca compared to typical CI chondrites. To identify the cause of this discrepancy, here we report stable Ca isotopic data (expressed as δ44/40CaSRM915a) for returned Ryugu samples collected from two sites. We found that samples from both sites have similar δ44/40CaSRM915a (0.58 ± 0.03 ‰ and 0.55 ± 0.08 ‰, 2 s.d.) that fall within the range defined by CIs. This isotopic similarity suggests that the Ca budget of CIs and Ryugu samples is dominated by carbonates, and the variably higher Ca contents in Ryugu samples are due to the abundant carbonates. Precipitation of carbonates on Ryugu likely coincided with a major episode of aqueous activity dated to have occurred ~5 Myr after Solar System formation. Based on the pristine Ryugu samples, the average δ44/40CaSRM915a of the Solar System is defined to be 0.57 ± 0.04 ‰ (2 s.d.).
AbstractList The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) Ryugu to Earth. Previous petrological and chemical analyses support a close link between Ryugu and CI chondrites that are presumed to be chemically the most primitive meteorites with a solar-like composition. However, Ryugu samples are highly enriched in Ca compared to typical CI chondrites. To identify the cause of this discrepancy, here we report stable Ca isotopic data (expressed as δ44/40CaSRM915a) for returned Ryugu samples collected from two sites. We found that samples from both sites have similar δ44/40CaSRM915a (0.58 ± 0.03 ‰ and 0.55 ± 0.08 ‰, 2 s.d.) that fall within the range defined by CIs. This isotopic similarity suggests that the Ca budget of CIs and Ryugu samples is dominated by carbonates, and the variably higher Ca contents in Ryugu samples are due to the abundant carbonates. Precipitation of carbonates on Ryugu likely coincided with a major episode of aqueous activity dated to have occurred ~5 Myr after Solar System formation. Based on the pristine Ryugu samples, the average δ44/40CaSRM915a of the Solar System is defined to be 0.57 ± 0.04 ‰ (2 s.d.).
Author Aléon, J.
Yoneda, S.
McKeegan, K. D.
Onose, M.
Tanaka, S.
Nguyen, A.
Yamashita, K.
Okazaki, R.
Masuda, Y.
Nesvorný, D.
Yui, H.
Walker, R. J.
Yurimoto, H.
Kitajima, K.
Komatani, S.
Usui, T.
Paquet, M.
Nagashima, K.
Kita, N. T.
Ireland, T. R.
Kawasaki, N.
Haba, M. K.
Zhang, A. -C.
Dai, W.
Terada, K.
Qin, L.
Terui, F.
Watanabe, S. -I.
Fukai, R.
Kleine, T.
Sakamoto, K.
Ito, M.
Alexander, C. M.O'D
Pack, A.
Nakazawa, S.
Tafla, L.
Nishimura, M.
Homma, H.
Bizzarro, M.
Sakamoto, N.
Yabuta, H.
Wada, S.
Yin, Q. -Z.
Saiki, T.
Di Rocco, T.
Huss, G. R.
Liu, M. -C.
Bouvier, A.
Krot, A. N.
Fujiya, W.
Terada, Y.
Ishikawa, A.
Morita, M.
Ichida, K.
Amelin, Y.
Choi, B. -G.
Nakai, I.
Iizuka, T.
Park, C.
Itoh, S.
Motomura, K.
Yogata, K.
Carlson, R. W.
Miyazaki, A.
Noguchi, T.
Hibiya, Y.
Nittler, L.
Amari, S.
Gautam, I.
Yoshikawa, M.
Dauphas, N.
Hidaka, H.
Yokoyama, T.
Moynier, F.
Chaussidon, M.
Yada, T.
Abe, M.
Russell, S. S.
Hoppe, P.
Nakato, A.
Tachibana, S.
Schönbächler, M.
Wadhwa, M.
Piani, L.
Hu, Y.
Tang, H.
Okada, T.
Tsuda, Y.
Young, E. D.
Bajo, K. -I.
Nakamura, T.
Davis, A. M.
Abe, Y.
Naraok
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Snippet The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) Ryugu to Earth. Previous petrological and chemical analyses support a close...
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Title The Solar System calcium isotopic composition inferred from Ryugu samples
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