Fig. 9.

Δ¹⁷O values of individual host chondrules in the CM chondrites Paris (this work) and Murchison (Chaumard et al., 2018) and Mg#s superimposed by oxygen isotope mixing curves of constant dust enrichment and ice enhancement from Tenner at el. (2015) and Hertwig et al. (2018). In this model, the anhydrous silicate dust, Solar gas, water ice, and organics in the dust are considered to have Δ¹⁷O values of −8.0‰, −28.4‰, +2.0‰, and +11.3‰, respectively (Hertwig et al., 2018). Chondrule Mg# uncertainties correspond to the range of measured values, while uncertainties in Δ¹⁷O are the propagated 2SE.