Physics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.271..338j&link_type=abstract
Nature, vol. 271, Jan. 26, 1978, p. 338, 339. Research supported by the Gesellschaft für Kernforschung.
Physics
7
Argon Isotopes, Meteorites, Potassium Isotopes, Radioactive Age Determination, Meteorite Collisions, West Germany
Scientific paper
Information concerning the processes which are able to reset radioactive clocks is important for the proper interpretation of radiometric rock ages. An investigation was conducted regarding the K-Ar system. The investigation involved the dating of variously shocked samples from ejecta and from a drill core through one of the best documented terrestrial meteorite craters, the Noerdlinger Ries in Germany. In an application of the modern version of K-Ar dating (Ar-39-Ar-40 technique) it was found that with the exception of the impact glass and the moldavite, both of which gave the impact age, 14.7 Myr, all samples yield plateau ages of approximately 313 Myr. It is concluded that shock pressure per se even as high as 400 kbar does not cause any significant argon loss. Consequently, any eventual age changes caused by meteorite impacts must be related to the temperature elevations associated with the impact and the rate of heat dissipation afterwards.
Dominik B.
Jessberger Elmar K.
Kirsten Toralf
Schaeffer Oliver A.
Staudacher Thomas
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