Ar-40/Ar-39 dating, AR diffusion properties, and cooling rate determinations of severely shocked chondrites

Details Ar-40/Ar-39 dating, AR diffusion properties, and cooling rate determinations of severely shocked chondrites Ar-40/Ar-39 dating, AR diffusion properties, and cooling rate determinations of severely shocked chondrites

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1667b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Nov. 1980, p. 1667-1682.

Computer Science

28

Argon Isotopes, Chondrites, Meteoritic Composition, Shock Heating, Cooling, Ejecta, Gaseous Diffusion, Minerals, Temperature Effects, Meteorites, L Chondrites, H Chondrites, Argon, Isotopic Ratios, Shock, Diffusion, Properties, Cooling Rate, Ages, Dating Techniques, Phases, Shaw Meteorite, Louisville Meteorite, Farmington Meteorite, Comparisons, Wickenburg Meteorite, Orvinio Meteorite, Arapahoe Meteorite, Outgassing, Lubbock Meteorite, Minerals, Experiments, Temperatures, Nickel, Data, Procedure, Potassium,

Scientific paper

The ages of Ar-40/Ar-39 chondrites were computed to be 4.29 to 1.0 Gyr, with degassing times of 0.5 to 1.0 Gyr. The values of the diffusion parameter for Ar in Arrhenius plots show linear relationships which correspond to the degassing of different mineral phases with distinct K/Ca ratios and different average temperatures for Ar release. The experimental values of the diffusion parameter for the high-temperature phase of severely shocked chondrites are 10 to the -7th to 10 to the -5th/s for the shock-heating temperatures in the 950-1200 C range; the inferred reheating temperatures and the fraction of the Ar-40 loss during the reheating event suggest post-shock cooling rates and burial depths of 0.01-0.0001 C/s and 0.5-2m, respectively.

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