Fig. 18.

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Schematic representation of formation of type I and II chondrules in CC. Previously condensed 16O-rich AOAs, mixed with other precursor material, experienced melting and gas–melt interactions that led to the formation of olivine-rich type I chondrules characterized by 50Ti-54Cr anomalies and the presence of 16O-rich olivine grains with Δ17O= ∼ −6‰. In CR chondrites, these type I chondrules mix with solar-like dust and experienced another melting episode. This results in the formation of larger chondrules with Δ17O= ∼ −2‰. Both types of type I chondrules were then recycled into type II chondrules with Mg-rich relic grains having Δ17O characteristics of the two generations of type I chondrules. This implies that the origin of chondrules must be extremely localized for producing type II chondrules without recycling all type I chondrules.
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