138La β-decay constant estimated from geochronological studies

A. Masuda, H. Shimizu, S. Nakai, Akio Makishima, S. Lahti

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

LaCe 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 LaCe ages (2129, 2325, 3271 Myr) evaluated for these rocks are 18-35% older than the SmNd ages for the same samples. To make the LaCe age fit to the SmNd 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 LaCe and SmNd 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.

Original languageEnglish
Pages (from-to)316-322
Number of pages7
JournalEarth and Planetary Science Letters
Volume89
Issue number3-4
DOIs
Publication statusPublished - 1988
Externally publishedYes

Fingerprint

gneiss
Radioactivity measurement
decay
gabbro
Greenland
Rocks
pegmatite
radioactivity
histories
rocks
history
rock
Hot Temperature
calculation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

138La β-decay constant estimated from geochronological studies. / Masuda, A.; Shimizu, H.; Nakai, S.; Makishima, Akio; Lahti, S.

In: Earth and Planetary Science Letters, Vol. 89, No. 3-4, 1988, p. 316-322.

Research output: Contribution to journalArticle

Masuda, A. ; Shimizu, H. ; Nakai, S. ; Makishima, Akio ; Lahti, S. / 138La β-decay constant estimated from geochronological studies. In: Earth and Planetary Science Letters. 1988 ; Vol. 89, No. 3-4. pp. 316-322.
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AU - Nakai, S.

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AU - Lahti, S.

PY - 1988

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N2 - LaCe 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 LaCe ages (2129, 2325, 3271 Myr) evaluated for these rocks are 18-35% older than the SmNd ages for the same samples. To make the LaCe age fit to the SmNd 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 LaCe and SmNd 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.

AB - LaCe 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 LaCe ages (2129, 2325, 3271 Myr) evaluated for these rocks are 18-35% older than the SmNd ages for the same samples. To make the LaCe age fit to the SmNd 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 LaCe and SmNd 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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