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Ar-39 - Ar-40 ages of acapulcoites and lodranites: Evidence for early parent body heatingNew age dating of acapulcoites (Acapulco, Monument Draw) and lodranites (Gibson) allow us to reconstruct the history of their parent body in a chronological framework. These meteorites originated on a common parent body -4.55 Ga ago. Non-collisional heating caused partial melting, with lodranites having been heated slightly higher than acapulcoites. This parent body cooled to the Ar closure temperature at -4.51 Ga for acapulcoites and -4.48 Ga for lodranites. The difference in ages is consistent with the higher temperature and longer cooling time for lodranites. Cooling probably occurred at a few to tens of deg C/Ma, with slower cooling rates at lower temperatures.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Bogard, D. D.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Garrison, D. H.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Mccoy, T. J.
(Hawaii Univ. Honolulu., United States)
Keil, K.
(Hawaii Univ. Honolulu., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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