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Carbonaceous achondrites Northwest Africa 6704/6693: Milestones for early Solar System chronology and genealogy

Sanborn, Matthew E.; Wimpenny, Josh B; Williams, Curtis D.; Yamakawa, Akane; Amelin, Yuri; Irving, Anthony; Yin, Qing-zhu


Northwest Africa (NWA) 6704/6693 are medium- to coarse-grained achondrites with unique petrologic and geochemical traits that are distinct from the currently established meteorite groups. Here, we report on the extinct 26Al-26Mg and 53Mn-53Cr systems to establish fine-scale chronology of its formation and Cr and Ti isotopic anomalies to constrain the composition of the source reservoir of NWA 6704/6693. Excesses in the neutron-rich 54Cr and 50Ti isotopes, due to nucleosynthetic anomalies,...[Show more]

CollectionsANU Research Publications
Date published: 2019
Type: Journal article
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/j.gca.2018.10.004


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