Physics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37....1u&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 1, p. 1-12.
Physics
13
Scientific paper
The Rb-Sr, Sm-Nd, and U-Pb 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 Rb-Sr and 238U-206Pb data of mineral separates do not define an isochron but the Sm-Nd data define an internal isochron which corresponds to the formation age of 4.58 +/- 0.12 b.y. (109 years). The 207Pb-206Pb data of mineral separates define an apparent age of 4.53 +/- 0.03 b.y., however we conclude that this age, while in agreement with the Sm-Nd age, is not strictly valid since the U-Pb data indicate at least three stages of evolution. The U-Pb data indicate that the parent body of the meteorite experienced brecciation shortly after the formation of the parent body surface (~4.2-4.45 b.y. ago) and a recent disturbance (collision?) 6 +/- 30 m.y. ago. The latter age is within the range of cosmic ray exposure ages for achondrites.
Nakamura Noboru
Tatsumoto Mitsunobu
Unruh Daniel M.
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