Ar-39 - Ar-40 ages of acapulcoites and lodranites: Evidence for early parent body heating

Details Ar-39 - Ar-40 ages of acapulcoites and lodranites: Evidence for early parent body heating Ar-39 - Ar-40 ages of acapulcoites and lodranites: Evidence for early parent body heating

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..141b&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 141-142 (SEE N94-12015 01-91)

Mathematics

Logic

2

Achondrites, Aging, Argon Isotopes, Chondrites, Heating, Meteoritic Composition, Cooling, Melting, Mineralogy

Scientific paper

New 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.

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