F. Moynier, W. Dai, T. Yokoyama, Y. Hu, M. Paquet, Y. Abe, J. Aléon, C. Alexander, S. Amari, Y. Amelin, K. Bajo, M. Bizzarro, A. Bouvier, R. Carlson, M. Chaussidon, B.-G. Choi, N. Dauphas, A. Davis, T. Di Rocco, W. Fujiya, R. Fukai, I. Gautam, M. Haba, Y. Hibiya, H. Hidaka, H. Homma, P. Hoppe, G. Huss, K. Ichida, T. Iizuka, T. Ireland, A. Ishikawa, M. Ito, S. Itoh, N. Kawasaki, N. Kita, K. Kitajima, T. Kleine, S. Komatani, A. Krot, M. Liu, Y. Masuda, K. McKeegan, M. Morita, K. Motomura, I. Nakai, K. Nagashima, D. Nesvorný, A. Nguyen, L. Nittler, M. Onose, A. Pack, C. Park, L. Piani, L. Qin, S. S. Russell, N. Sakamoto, M. Schönbächler, L. Tafla, H. Tang, K. Terada, Y. Terada, T. Usui, S. Wada, M. Wadhwa, R. Walker, K. Yamashita, Q. Yin, S. Yoneda, E. Young, H. Yui, Alvin Zhang, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, K. Sakamoto, H. Yabuta, M. Abe, A. Miyazaki, A. Nakato, M. Nishimura, T. Okada, T. Yada, K. Yogata, S. Nakazawa, T. Saiki, S. Tanaka, F. Terui, Y. Tsuda, S. Watanabe, M. Yoshikawa, S.
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Saiki, S. Tanaka, F. Terui, Y. Tsuda, S. Watanabe, M. Yoshikawa, S.","doi":"10.7185/geochemlet.2238","DOIUrl":null,"url":null,"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 δ 44/40 Ca SRM915a ) for returned Ryugu samples collected from two sites. We found that samples from both sites have similar δ 44/40 Ca SRM915a (0.58 ± 0.03 ‰ and 0.55 ± 0.08 ‰ , 2 s.d.) that fall within the range defined by CIs. 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Bouvier, R. Carlson, M. Chaussidon, B.-G. Choi, N. Dauphas, A. Davis, T. Di Rocco, W. Fujiya, R. Fukai, I. Gautam, M. Haba, Y. Hibiya, H. Hidaka, H. Homma, P. Hoppe, G. Huss, K. Ichida, T. Iizuka, T. Ireland, A. Ishikawa, M. Ito, S. Itoh, N. Kawasaki, N. Kita, K. Kitajima, T. Kleine, S. Komatani, A. Krot, M. Liu, Y. Masuda, K. McKeegan, M. Morita, K. Motomura, I. Nakai, K. Nagashima, D. Nesvorný, A. Nguyen, L. Nittler, M. Onose, A. Pack, C. Park, L. Piani, L. Qin, S. S. Russell, N. Sakamoto, M. Schönbächler, L. Tafla, H. Tang, K. Terada, Y. Terada, T. Usui, S. Wada, M. Wadhwa, R. Walker, K. Yamashita, Q. Yin, S. Yoneda, E. Young, H. Yui, Alvin Zhang, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, K. Sakamoto, H. Yabuta, M. Abe, A. Miyazaki, A. Nakato, M. Nishimura, T. Okada, T. Yada, K. Yogata, S. Nakazawa, T. Saiki, S. Tanaka, F. Terui, Y. Tsuda, S. Watanabe, M. 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引用次数: 12
摘要
隼鸟2号宇宙飞船已将cb型小行星(162173)龙宫的样本带回地球。先前的岩石学和化学分析支持了Ryugu和CI球粒陨石之间的密切联系，它们被认为是化学上最原始的陨石，具有类似太阳的成分。然而，与典型的CI球粒陨石相比，Ryugu样品富含Ca。为了确定这种差异的原因，我们报告了从两个地点收集的龙宫样品的稳定Ca同位素数据(表示为δ 44/40 Ca SRM915a)。我们发现两个地点的样品具有相似的δ 44/40 Ca SRM915a(0.58±0.03‰和0.55±0.08‰，2 s.d)，属于ci定义的范围。这种同位素相似性表明，CIs和琉球样品的Ca收支以碳酸盐为主，琉球样品中Ca含量的变化是由于丰富的碳酸盐所致。龙宫上碳酸盐的沉淀很可能与太阳系形成后约5 Myr发生的一次主要的水活动相吻合。根据原始龙宫样品，确定了太阳系δ 44/40 Ca SRM915a平均值为0.57±0.04‰(2
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, 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 δ 44/40 Ca SRM915a ) for returned Ryugu samples collected from two sites. We found that samples from both sites have similar δ 44/40 Ca SRM915a (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 δ 44/40 Ca SRM915a of the Solar System is defined to be 0.57 ± 0.04 ‰ (2
期刊介绍：
Geochemical Perspectives Letters is an open access, internationally peer-reviewed journal of the European Association of Geochemistry (EAG) that publishes short, highest-quality articles spanning geochemical sciences. The journal aims at rapid publication of the most novel research in geochemistry with a focus on outstanding quality, international importance, originality, and stimulating new developments across the vast array of geochemical disciplines.
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