Fig. 3: Oxygen isotope composition of the samples analysed in this study.
From: Oxygen isotope evidence from Ryugu samples for early water delivery to Earth by CI chondrites
Ryugu particles (green squares) show a wide variation in δ18O values, which reflects intrinsic isotopic heterogeneity at the sampling scale involved (see text for further discussion). CI chondrites (coloured diamonds) and CY chondrites (coloured triangles) were analysed for comparison purposes with the Ryugu particles. In terms of their δ18O values, the weighted average value for the Ryugu particles and the mean value for the CIs (Alais, Ivuna and Orgueil) are very close in composition (Table 1). In contrast, the mean value for the CY chondrite Y-82162 is substantialy displaced to higher δ18O values compared to either the Ryugu particles or CIs. CM2 Line is the extension of the best fit line through CM2 falls and finds shown in Fig. 2. Error bars ±2 s.d.
