The ²⁶Al-²⁶Mg systematics of FeO-rich chondrules from Acfer 094: two chondrule generations distinct in age and oxygen isotope ratios.

ABSTRACT: The ²⁶Al-²⁶Mg ages of FeO-rich (type II) chondrules from Acfer 094, one of the least thermally metamorphosed carbonaceous chondrites, were determined by SIMS analysis of plagioclase and olivine/pyroxene using a radio frequency (RF) plasma oxygen ion source. In combination with preexisting ²⁶Al-²⁶Mg ages of FeO-poor (type I) chondrules, the maximum range of formation ages recorded in chondrules from a single meteorite is determined to help provide constraints on models of material transport in the proto-planetary disk. We also report new SIMS oxygen three-isotope analyses of type II chondrules in Acfer 094. All but one of the plagioclase analyses show resolvable excesses in ²⁶Mg and isochron regressions yield initial ²⁶Al/

SUBMITTER: Hertwig AT 

PROVIDER: S-EPMC7094794 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature