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Problems Related to Interplanetary Matter (1961) / Chapter Skim
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PRIMORDIAL ARGON AND NEON IN STONE METEORITES
Pages 15-21

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From page 15...
... However, for the carbonaceous chondrites atmospheric contamination can be excluded by comparing the observed Ar40/Ne20 ratios with the corresponding atmospheric ratio, and therefore the excess neon is considered to be primordial. Table 2 shows the effect of adsorbed atmospheric argon.
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From page 16...
... f> ro CO rt rt CO Cxi cO CO rt g eiH O ^ 1^3 in in in in in in m m CO !
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From page 17...
... All samples listed in Table 1 have been predegassed. Therefore, the Ar abundances given in Table 1 are equal to the abundances of radiogenic Ar40, except for the sample Goalpara, where a considerable fraction of the adsorbed argon survives the predegassing.
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From page 18...
... 1-4 >o ro -H oo in in m xO o in S CO i -- i ^-i ^H T^ in oo •xf >o ^ a^ ^ bo ^ o o rM •vf rr-H (M Pu ' i -- 1 i -- t i -- 1 1 -- 4 -- H CO o o O O O O O O O o O xO xO CJ ^i IM in -H oo m •-" xO p.H in ro r00 B (4 ro ^H o ^" 00 ro O "^ r^ t -- 1 in i C <3 ro ro -- i ro ra o 9 -- t c •f.H •i-, C W
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From page 19...
... The high Ar/K age of Felix shows that no loss of radiogenic argon and -- because of the difference in diffusion coefficients -- no loss of primordial argon occurred since the formation of this meteorite. Only minor losses of primordial neon could have occurred.
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From page 20...
... ca co cu cu JS XI U TJ "O cu cu c .
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From page 21...
... It can be seen from Table 5 that in some cases the primordial isotopic ratios differ from the atmospheric values. The errors are rather high, due to the uncertainty in the correction for the cosmogenic rare gases.
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Key Terms

  • primordial argon
  • radiogenic argon
  • carbonaceous chondrites
  • diffusion coefficients
  • adsorbed atmospheric

  • atmospheric argon
  • cosmogenic neon
  • primordial neon
  • rror rror
  • stone meteorites

  • isotopic composition
  • adsorbed argon
  • primordial rare
  • cosmogenic rare
  • corresponding atmospheric

  • chondrites atmospheric
  • goalpara sample
  • ferent amounts
  • potassium analyses
  • gases occur

  • pumping releases
  • mathematical model
  • accurate value
  • isotopic ratios
  • measured isotopic

  • continuous pumping
  • argon survives
  • argon diffuses
  • samples mokoia
  • atmospheric ratio


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