Episodic formation of refractory inclusions in the Solar System and their presolar heritage.

ABSTRACT: Refractory inclusions [Ca-Al-rich Inclusions (CAIs) and Amoeboid Olivine Aggregates (AOAs)] in primitive meteorites are the oldest Solar System solids. They formed in the hot inner protoplanetary disk and, as such, provide insights into the earliest disk dynamics and physicochemical processing of the dust and gas that accreted to form the Sun and its planetary system. Using the short-lived ²⁶Al to ²⁶Mg decay system, we show that bulk refractory inclusions in CV (Vigarano-type) and CR (Renazzo-type) carbonaceous chondrites captured at least two distinct ²⁶Al-rich (²⁶Al/²⁷Al ratios of ~5 × 10^-5) populations of refractory inclusions characterized by different initial ²⁶Mg/²⁴Mg isotope compositions (μ²

SUBMITTER: Larsen KK 

PROVIDER: S-EPMC7611424 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature