The Solar System calcium isotopic composition inferred from Ryugu samples

• DOI: 10.7185/geochemlet.2238
• Publication Date: 2022-10-19T15:50:22Z
• Authors: F. Moynier; W. Dai; T. Yokoyama; Y. Hu; M. Paquet; Y. Abe; J. Aléon; C.M.O'D Alexander; S. Amari; Y. Amelin; K.-I. Bajo; M. Bizzarro; A. Bouvier; R.W. Carlson; M. Chaussidon; B.-G. Choi; N. Dauphas; A.M. Davis; T. Di Rocco; W. Fujiya; R. Fukai; I. Gautam; M.K. Haba; Y. Hibiya; H. Hidaka; H. Homma; P. Hoppe; G.R. Huss; K. Ichida; T. Iizuka; T.R. Ireland; A. Ishikawa; M. Ito; S. Itoh; N. Kawasaki; N.T. Kita; K. Kitajima; T. Kleine; S. Komatani; A.N. Krot; M.-C. Liu; Y. Masuda; K.D. 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.J. Walker; K. Yamashita; Q.-Z. Yin; S. Yoneda; E.D. Young; H. Yui; A.-C. 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.-I. Watanabe; M. Yoshikawa; S. Tachibana; H. Yurimoto
• Keywords: 440; METEORITES; MODAL MINERALOGY; FRACTIONATION; 500; CI; 01 natural sciences; CHONDRITES; ELEMENT ABUNDANCES; 13. Climate action; [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry; EARTH; REFRACTORY INCLUSIONS; 0105 earth and related environmental sciences

Ryugu C A CI CM CV CO 44/40 Ca SRM915a (age corrected)The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) to Earth.Previous petrological and chemical analyses support a close link between chondrites that are presumed be chemically most primitive meteorites with solar-like composition.However, highly enriched in compared typical chondrites.To identify cause of this discrepancy, here we report stable isotopic data (expressed as δ ) for collected two sites.We found both sites have similar (0.58 ± 0.03 ‰ 0.55 0.08 ‰, 2 s.d.) fall within range defined by CIs.This similarity suggests budget CIs is dominated carbonates, variably higher contents due abundant carbonates.Precipitation carbonates on likely coincided major episode aqueous activity dated occurred ∼5 Myr after Solar System formation.Based pristine samples, average 0.57 0.04 (2 s.d.).