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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 structureShock 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.
Document ID
19760032827
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Winzer, S. R.
(Martin Marietta Laboratories Baltimore, Md., United States)
Lum, R. K. L.
(Martin Marietta Labs. Baltimore, MD, United States)
Schuhmann, S.
(NASA Goddard Space Flight Center Astrochemistry Branch, Greenbelt, Md., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 40
Subject Category
Geophysics
Accession Number
76A15793
Distribution Limits
Public
Copyright
Other

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