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Nakanishi, N. ; Yokoyama, T. ; Ishikawa, A. ; Walker, R. J. ; Abe, Y. ; Aléon, J. ; Alexander, C. M. O'D ; Amari, S. ; Amelin, Y. ; Bajo, K.-I. ; Bizzarro, M. ; Bouvier, Audrey ; 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. ; Itoh, S. ; Kawasaki, N. ; Kita, N. T. ; Kitajima, K. ; Kleine, T. ; Komatani, S. ; Krot, A. N. ; Liu, M.-C. ; Masuda, Y. ; Morita, M. ; Motomura, K. ; Moynier, F. ; Nakai, I. ; Nagashima, K. ; 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. ; 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.:
Nucleosynthetic s-Process Depletion in Mo from Ryugu samples returned by Hayabusa2.
In: Geochemical Perspectives Letters.
Bd. 28
(2023)
.
- S. 31-36.
ISSN 2410-3403
DOI: https://doi.org/10.7185/geochemlet.2341
Abstract
Initial analyses of samples collected from two locations on the asteroid Ryugu indicated that the mineralogical, chemical, and isotopic characteristics of the Ryugu samples show similarities to carbonaceous chondrites, particularly the Ivuna-type (CI) group. In this study, we analysed a composite sample of four bulk Ryugu samples (A0106, A0106-A0107, C0107, and C0108) collected from both sampling locations that were combined in order to determine its mass independent Mo isotopic composition and reveal contributions from diverse nucleosynthetic sources. The ɛ94Mo and ɛ95Mo values for the Ryugu sample are characterised by the carbonaceous chondrite (CC)-type, which is consistent with the nucleosynthetic isotope compositions observed for other elements (Cr, Ti, Fe, and Zn). The Ryugu composite sample, however, is characterised by greater s-process depletion of Mo isotopes compared with any known bulk carbonaceous chondrite, even including CI chondrites. The observed Mo isotopic signature in the Ryugu composite was most likely caused by either incomplete digestion of s-process-rich presolar SiC, or biased sampling of materials enriched in aqueously-formed secondary minerals characterised by s-process-poor Mo isotopes, resulting from the physicochemical separation between s-process-rich presolar grains and a complementary s-process-poor aqueous fluid in the Ryugu parent body.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik - BGI |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
| Eingestellt am: | 12 Nov 2024 06:45 |
| Letzte Änderung: | 12 Nov 2024 06:45 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/91012 |