Affiliation:
1. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada.
Abstract
The use of radioactive decay of
176
Lu to
176
Hf to study the evolution of the Earth requires a precise and accurate value for the
176
Lu decay constant. Recent determinations of this decay constant by age comparison to the more precisely calibrated U-Pb isotopic system produced internally consistent but discrepant values between terrestrial minerals and meteorites. New highly radiogenic Lu-Hf data for phosphate minerals from Richardton (ordinary chondrite) and Acapulco (primitive achondrite) yield decay constant values of 1.864 × 10
–11
± 0.016 × 10
–11
and 1.832 × 10
–11
± 0.029 × 10
–11
year
–1
, respectively, identical to the value determined from terrestrial minerals.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
88 articles.
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