Allende meteorite - Old age but normal isotopic composition of potassium

Details Allende meteorite - Old age but normal isotopic composition of potassium Allende meteorite - Old age but normal isotopic composition of potassium

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..290s&link_type=abstract

Nature, vol. 282, Nov. 15, 1979, p. 290, 291.

Computer Science

4

Mass Spectroscopy, Meteoritic Composition, Potassium Isotopes, Surface Ionization, Time Measurement, Chronology, Ion Exchanging, Solar System, Tables (Data)

Scientific paper

The isotopic composition of potassium in the Allende meteorite is investigated in an attempt to verify the assumption of Jessberger and Dominik (1979) of normal potassium isotope composition used in the identification of Allende inclusions predating the solar system. Samples of Allende inclusion 18 were decomposed in acid, and potassium was separated by ion exchange and analyzed by mass spectrometry by surface ionization using a secondary electron multiplier on a Faraday cup. It is found that neither the K-39/K-41 nor the K-41/K-40 ratio shows any evidence for an anomaly with respect to terrestrial samples of more than 1%. Results indicate that the apparent old age of this inclusion cannot be due to an anomalous enrichment of K-40, thus supporting its presolar characterization.

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