Other
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42..380j&link_type=abstract
Icarus, vol. 42, June 1980, p. 380-405.
Other
17
Argon Isotopes, Carbonaceous Chondrites, Chemical Composition, Meteoritic Composition, Radioactive Age Determination, Data Reduction, Electron Microscopy, Mass Spectroscopy, Microanalysis, Mineralogy, Potassium Isotopes, Tables (Data), X Ray Diffraction, Meteorites, Allende Meteorite, Ages, Isotopic Ratios, Dating Techniques, Chronology, Samples, Meteorite, Potassium/Argon, Argon/Argon, Rocks, Matrix, Comparisons, Chondrules, Inclusions, Grain, Aggregates, Mineralogy, Chemistry, Electron Microprobe, Analysi
Scientific paper
K-Ar and/or Ar-40-Ar-39 plateau ages of Allende samples - whole rock, matrix, chondrules, white inclusions - range from 3.8 AE for matrix to greater than approximately 5 AE for some white inclusions, but cluster strongly near 4.53 AE. This age marks the dominant K-Ar resetting of Allende materials. Age spectra show disturbances due to Ar-39 recoil or some other argon redistribution processes. Possible explanations for the apparent presolar ages (greater than 4.6 AE) include: greater than approximately 20% loss of AR-39, greater than approximately 40% loss of K-40 approximately 3.8 AE ago with no loss of Ar-40, trapped argon of unique AR-40/AR-36 isotopic composition, admixture of very old presolar grains.
Dominik B.
Herzog Gregory F.
Jessberger Elmar K.
Staudacher Thomas
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