Blinova, A; Amelin, Yuri; Samson, C
To constrain the metamorphic history of the H-chondrite parent body, we dated phosphates and chondrules from four H6 chondritic meteorites using U-Pb systematics. Reconnaissance analyses revealed that only Estacado had a sufficiently high 206Pb/204Pb ratio suitable for our purposes. The Pb-Pb isochron date for Estacado phosphates is measured to be 4492 ± 15 Ma. The internal residue-second leachate isochron for Estacado chondrules yielded the chondrule date of 4546 ± 18 Ma. An alternative age...[Show more]
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