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Problems Related to Interplanetary Matter (1961) / Chapter Skim
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STRONTIUM AND RUBIDIUM IN STONE METEORITES
Pages 85-89

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From page 85...
... Most of the measurements reported here were done on the same mass spectrometer, under closely similar conditions, in order to minimize any errors arising from varying mass discrimination effects. Much of this data has been reported previously and requires little comment.
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From page 86...
... (2) The ages given are model ages in the sense that they date the hypothetical differentiation of calcium-rich achondrites from chondritic material.
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From page 87...
... Powder photographs of the residues afforded several weak lines corresponding to plagioclase feldspar, as might be expected from the inferred high K and Rb content. Perhaps the sampling problem is due to the presence of large grains of plagioclase, inhomogeneously distributed, in which most of the K and Rb is situated.
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From page 88...
... The results on perchloric acid digestion were cited as an objection to a large effect by leaching. Gast indicated that he intended to test this hypothesis experimentally, by attempting to leach out Rb and Sr87 artificially.]
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From page 89...
... Eighteen and 55 per cent of TABLE 4 Per Cent Extractable Alkalies in Beards ley II K Rb Cs A 3.5% 12.6% 35% B 1.8% 5.7% 20% the Rb and Cs respectively were removed in these experiments. The results support the hypothesis that rubidium and radiogenic strontium were removed from the first Beardsley sample while it was in the ground.
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Key Terms

  • perchloric acid
  • beardsley sample
  • density similar
  • age obtained
  • beardsley samples

  • presumed primordial
  • definite birefringence
  • content measured
  • negligible increment
  • little comment

  • optical criteria
  • radiogenic strontium
  • forest city
  • grains displayed
  • discrimination effects

  • extractable alkalies
  • silicate glasses
  • model age
  • plagioclase feldspar
  • increment added

  • thetical differentiation
  • similar conditions
  • acid digestion
  • weak lines
  • experiments attempting

  • lines corresponding
  • model ages
  • chondritic material
  • performed subsequent
  • requires little


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