138La β-decay constant estimated from geochronological studies

Details 138La β-decay constant estimated from geochronological studies 138La β-decay constant estimated from geochronological studies

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89..316m&link_type=abstract

Earth and Planetary Science Letters, Volume 89, Issue 3-4, p. 316-322.

Mathematics

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Scientific paper

La-Ce ages are reported for two sets of Finnish pegmatites, Lövböle and Mustikkamäki, and for an Amîtsoq gneiss, Greenland. When λβ 138La value (2.29 × 10-12 yr-1) obtained by radioactivity measurement [1] is used for the chronological calculation, the La-Ce ages (2129, 2325, 3271 Myr) evaluated for these rocks are 18-35% older than the Sm-Nd ages for the same samples. To make the La-Ce age fit to the Sm-Nd age for the same sample, a new value of (2.77 +/- 0.21) × 10-12 yr-1 is evaluated for λβ 138La. In this calculation, the La-Ce and Sm-Nd ages reported for a Bushveld gabbro [2] have been also taken into account together with those for the Lövböle pegmatite and the Mustikkamäki pegmatite, while the Amîtsoq gneiss (GGU110999) has been omitted because of the complicated thermal history of this sample.

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