Isotope systematics and shock-wave metamorphism. III - K-Ar in experimentally and naturally shocked rocks; the Haughton impact structure, Canada

Details Isotope systematics and shock-wave metamorphism. III - K-Ar in experimentally and naturally shocked rocks; the Haughton impact structure, Canada Isotope systematics and shock-wave metamorphism. III - K-Ar in experimentally and naturally shocked rocks; the Haughton impact structure, Canada

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1591s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, April 1992, p. 1591-1605.

Mathematics

Logic

5

Argon Isotopes, Hypersonic Shock, Hypervelocity Impact, Metamorphic Rocks, Meteorite Craters, Potassium Compounds, Canada, Lunar Craters, Lunar Evolution, Mineralogy, Solar System Evolution

Scientific paper

This is a report on the first comparative study of the effects of experimental and natural shock on the K-Ar system. First, mineral separates from a 451 +/- 1 Ma old gneiss, experimentally shocked up to 60 GPa, were investigated by stepwise heating Ar-40/Ar-39 technique. Compared with an unshocked sample, the shocked samples have lower Ar-40/Ar-39 ages, and the diffusion properties have changed depending on peak shock pressure and mineralogic composition. Total resetting of the K-Ar clock did not occur. Secondly, to compare these results with the effects of natural shock, samples from the about 23 Ma old Haughton impact crater, Devon Island, Canada, with different shock stages were investigated. Up to shock stage III, no total resetting of the K-Ar clock was observed, but severe argon losses, depending on shock pressure, result in Ar-40/Ar-39 plateau ages which are incorrect in terms of the true crater age, yet they provide an upper limit to the time of the cratering event.

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