A new geochronometer using lanthanum-138

Details A new geochronometer using lanthanum-138 A new geochronometer using lanthanum-138

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..433n&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, April 3, 1986, p. 433-435.

Mathematics

Logic

4

Chronometers, Geochronology, Lanthanum Isotopes, Radioactive Decay, Barium Isotopes, Electron Capture, Gneiss, Neodymium Isotopes, Samarium Isotopes

Scientific paper

A new geochronometer, based on the decay of La-138 to Ba-138, has been applied to a sample of Amitsoq gneiss from West Greenland. Using a value for the electron-capture decay constant of 4.44 x 10 to the -12th/yr, the resulting age (2408 + or - 24 Myr) is in good agreement with that from Sm-Nd systematics (2410 + or - 54 Myr). Application of this geological clock is limited to REE (rare earth element)-rich minerals, but its merit is that, for Archaean rocks, the age can be evaluated from one specimen on the assumption that the initial Ba isotope ratios are effectively constant.

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