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Constraints on the cooling history of the H-chondrite parent body from phosphate and chondrule Pb-isotopic dates from Estacado

Blinova, A; Amelin, Yuri; Samson, C

Description

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]

CollectionsANU Research Publications
Date published: 2007
Type: Journal article
URI: http://hdl.handle.net/1885/37128
Source: Meteoritics and Planetary Science

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