Fig. 4.

(A) ε⁵⁰Ti versus ε⁵⁴Cr for bulk carbonaceous chondrites reported in the literature prior to this study (black and white symbols). These literature data points represent the average (±2SD) values of ε⁵⁰Ti and ε⁵⁴Cr of individual meteorites belonging to the CI (Ivuna-like), CB (Bencubbin-like), CR (Renazzo-like), CM, CO, CV, and CK (Karoonda-like) chondrite groups; note that both ε⁵⁰Ti and ε⁵⁴Cr data have been previously reported for only one to three meteorites from each carbonaceous chondrite group. Shaded and labeled regions represent the ranges for each of these carbonaceous chondrite groups in ε⁵⁰Ti versus ε⁵⁴Cr space; the pink region represents CO chondrites, the blue region represents CM chondrites, and all other chondrite groups are indicated by gray regions. Literature data, as denoted by corresponding numbers in parentheses in the legend, are from: (1) Shukolyukov and Lugmair (2006); (2) Trinquier et al. (2007); (3) Trinquier et al. (2009); (4) Qin et al. (2010); (5) Yamashita et al. (2010); (6) Zhang et al. (2011); (7) Zhang et al. (2012); (8) Sanborn et al. (2019); and (9) Williams et al. (2020). (B) ε⁵⁰Ti versus ε⁵⁴Cr for the bulk carbonaceous chondrites studied here (colored symbols). Error bars are internal 2SE or external 2SD, whichever is larger. As shown in (A) above, the gray regions are the ranges of literature data for CI, CB, CR, CV, and CK chondrites; the regions for the CM (blue) and CO (pink) chondrites are expanded as a result of the data reported in the present study.