Abstract
anoa, 0 ) in these chondrules range from ~1 × 10 -6 to ~6 × 10 -6 . The other eight chondrules show no detectable 26 Mg excesses and have upper limits of ( 26 Al/ 27 Al)0 ~(2-3) × 10 -6 . Most CR chondrules have ( 26 Al/ 27 Al)0 significantly lower than those in the other least metamorphosed primitive chondrites, LL3.0, CO3.0, and Acfer 094 (ungrouped). Assuming uniform distri- bution of 26 Al in the protoplanetary disk, these observations suggest that majority of CR chondrules formed >1 Myr later than those in LL3.0, CO3.0, and Acfer 094.
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