Computer Science
Scientific paper
Jun 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..24...70s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 24, Issue 1-2, pp.70-82
Computer Science
13
Scientific paper
The abundance and isotopic composition of argon and neon in five carbonaceous chondrites and in two ureilites have been measured. The results show that these meteorites contain large amounts of trapped primordial gases. Heating experiments with only partial extraction of the rare gases have been carried out, showing that at 950°K the radiogenic argon diffuses out more readily than the primordial argon, and cosmogonic neon at about the same rate as primordial neon. From that it is concluded that the primordial gases are enclosed within the matrix of the crystal lattice. Argon-potassium ages and Ne 21 exposure ages have been calculated. Both are affected by diffusive losses. Only Felix has an A/K age of 4.5 AE (billion years). A large loss of primordial argon and neon as compared to the silicon is observed. The loss of primordial argon is constant within a factor 10 for all samples, and about ten to a hundred times smaller than the loss observed for the earth. The ratios of primordial Ne 20 to primordial A 36 have values between 0.005 and 22, indicating large fractionation between argon and neon as compared to the corresponding cosmic ratio. Fractionation by diffusive losses is discussed. Some deviations of the isotopic ratios of primordial argon and neon from the atmospheric ratios are observed.
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