New constraints on the 138La β-decay constant based on a geochronological study of granites from the Yilgarn Block, Western Australia

Akio Makishima, Eizo Nakamura, Syun iti Akimoto, Ian H. Campbell, Robert I. Hill

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The β-decay constant of 138La has been geochronologically determined using Archean granites from the Yilgarn Block, Western Australia. RbSr and SmNd mineral isochron ages were obtained for the two granite samples, which are nearly identical with the ion microprobe UPb zircon ages. This agreement indicates that the closure date for these samples is the same, within analytical error, making them suitable for geochronological estimation of the β-decay constant for 138La. Applying a new method of Ce isotope analysis, with analytical reproducibility of ±0.008%, LaCe isotope data for the studied samples resulted in precise mineral isochrons. Based on these internal mineral isochrons and ages determined by other geological clocks, the β-decay constant for 138La was estimated to be (2.33 ± 0.24)·10-12a-1 (2σ).

Original languageEnglish
Pages (from-to)293-300
Number of pages8
JournalChemical Geology
Volume104
Issue number1-4
DOIs
Publication statusPublished - Feb 10 1993

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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