26Al records in chondrules from unequilibrated ordinary chondrites: II. Duration of chondrule formation and parent body thermal metamorphism

²⁶Al in chondrules from CR2 chondrites

“…3, together with the observed ranges (average ± 2SD) of ( 26 Al/ 27 Al) 0 in chondrules from the least metamorphosed chondrites, LL3.0 Semarkona, CO3.0 Yamato 81020, and ungrouped type 3 chondrite Acfer 094 (from Hutcheon and Hutchison, 1989;Kita et al, 2000;Kunihiro et al, 2004;Kurahashi et al, 2008a;Rudraswami et al, 2008;Villeneuve et al, 2009;Ushikubo et al, 2013 Hutcheon and Hutchison (1989), Kita et al (2000), Kunihiro et al (2004), Kurahashi et al (2008a), Rudraswami et al (2008), Villeneuve et al (2009), and Ushikubo et al (2013).…”

Short-Lived Radionuclides and Early Solar System Chronology

“…The CAI wholerock curve is based on the data of Jacobsen et al (2008). Data sources are as follows: CAIs (Bouvier and Wadhwa, 2010;Jacobsen et al, 2008;Kita et al, 2012;MacPherson et al, 2010MacPherson et al, , 2012Makide et al, 2009), carbonaceous chondrite chondrules (Hsu et al, 2003;Hutcheon et al, 2009;Kunihiro et al, 2004;Kurahashi et al, 2008;Sugiura and Krot, 2007;Yurimoto and Wasson, 2002), and ordinary chondrite chondrules (Hutcheon and Hutchison, 1989;Kita et al, 2000;Mishra et al, 2010;Mostefaoui et al, 2002;Rudraswami and Goswami, 2007;Rudraswami et al, 2008;Villeneuve et al, 2009). The tail of the CAI curve extends to values above the canonical initial 26 Al/ 27 Al ratio $5.2 Â 10 À5 , but this only reflects uncertainties in individual internal isochrons.…”

An Fe isotope study of ordinary chondrites

“…Also, if the timing and duration of chondrule formation differed between or within chondrite groups (e.g. Amelin et al, 2002;Rudraswami et al, 2008), and chondrule formation was not wholly contemporaneous with the accretion of the earliest planetesimals (e.g. Markowski et al, 2006), then different precursor Fe isotope compositions for chondrites and planets are quite plausible.…”