Evolution of protoplanetary disk inferred from 26Al chronology of individual chondrules

Abstract

We review the 26Al ages of chondrules in various type 3.0 chondrites. The 26Al ages of chondrules are 1-3Myr after calcium-aluminum-rich inclusion (CAI) for LL3.0, CO3.0, and Acfer 094 (Ungrouped C 3.0). Available data for chondrules in CR chondrites indicate that many chondrules are relatively younger (≥3Myr), although data from chondrules in CR3.0 are not yet available to confirm their younger ages. The total ranges for the 26Al ages of chondrules in a single chondrite group are more than 0.5-1Myr. However, most chondrules show relatively narrow range of ages in a single chondrite group (0.2-0.4Myr, 1 SD), which might be short enough to preserve the group-specific chemical and isotope signatures against radial diffusion of solid in the disk. Distinct oxygen isotope reservoirs might exist in the protoplanetary disk simultaneously, which could be spatially separated. © 2011 The Meteoritical Society.