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History of the Pasamonte achondrite: Relative susceptibility of the SmNd, RbSr, and UPb systems to metamorphic events

Earth and Planetary Science Letters
By: , , and 
https://doi.org/10.1016/0012-821X(77)90141-8

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Abstract

The Rbsingle bondSr, Smsingle bondNd, and Usingle bondPb systematics of the eucrite Pasamonte have been studied in order to investigate the relative susceptibility of the different systems to post-crystallization events and to determine the age and history of the meteorite. The Rbsingle bondSr and238U-206Pb data of mineral separates do not define an isochron but the Smsingle bondNd data define an internal isochron which corresponds to the formation age of4.58 ± 0.12b.y. (109 years). The207Pb-206Pb data of mineral separates define an apparent age of4.53 ± 0.03b.y., however we conclude that this age, while in agreement with the Smsingle bondNd age, is not strictly valid since the Usingle bondPb data indicate at least three stages of evolution. The Usingle bondPb data indicate that the parent body of the meteorite experienced brecciation shortly after the formation of the parent body surface (∼4.2–4.45b.y. ago) and a recent disturbance (collision?)6 ± 30m.y. ago. The latter age is within the range of cosmic ray exposure ages for achondrites.

    Publication type Article
    Publication Subtype Journal Article
    Title History of the Pasamonte achondrite: Relative susceptibility of the SmNd, RbSr, and UPb systems to metamorphic events
    Series title Earth and Planetary Science Letters
    DOI 10.1016/0012-821X(77)90141-8
    Volume 37
    Issue 1
    Year Published 1977
    Language English
    Publisher Elsevier
    Description 12 p.
    First page 1
    Last page 12
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