Rb, Sr and strontium isotopic composition, K/Ar age and large ion lithophile trace element abundances in rocks and glasses from the Wanapitei Lake impact structure

Details Rb, Sr and strontium isotopic composition, K/Ar age and large ion lithophile trace element abundances in rocks and glasses from the Wanapitei Lake impact structure Rb, Sr and strontium isotopic composition, K/Ar age and large ion lithophile trace element abundances in rocks and glasses from the Wanapitei Lake impact structure

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40...51w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Jan. 1976, p. 51-57.

Computer Science

7

Meteorite Craters, Petrography, Radioactive Age Determination, Rubidium Isotopes, Strontium Isotopes, Abundance, Argon Isotopes, Canada, Chemical Composition, Electron Microscopes, Glass, Impact Damage, Metamorphic Rocks, Potassium Isotopes, Rocks, Trace Elements

Scientific paper

Shock metamorphosed rocks and shock-produced melt glasses from the Wanapitei Lake impact structure have been examined petrographically and by electron microprobe. Eleven clasts exhibiting varying degrees of shock metamorphism and eight impact-produced glasses have been analyzed for Rb, Sr and Sr isotopic composition. Five clasts and one glass have also been analyzed for large ion lithophile (LIL) trace element abundances including Li, Rb, Sr, and Ba and the REE's. The impact event forming the Wanapitei Lake structure occurred 37 m.y. ago based on K/Ar dating of glass and glassy whole-rock samples. Rb/Sr isotopic dating failed to provide a meaningful whole-rock or internal isochron. The isotopic composition of the glasses can be explained by impact-produced mixing and melting of metasediments.

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