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Some conventional potassium–argon and 40Ar/39Ar age studies of glauconite

Published online by Cambridge University Press:  01 May 2009

N. R. Brereton ,
P. J. Hooker  and
J. A. Miller
N. R. Brereton
Affiliation:
Department of Geodesy and Geophysics, University of Cambridge, Cambridge CB3 0EZ
P. J. Hooker
Affiliation:
Department of Geodesy and Geophysics, University of Cambridge, Cambridge CB3 0EZ
J. A. Miller
Affiliation:
Department of Geodesy and Geophysics, University of Cambridge, Cambridge CB3 0EZ
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Summary

40Ar/39Ar age studies of some glauconites from well-known stratigraphical horizons reveal unexpectedly high ages compared with the conventional K–Ar age determinations. These have been interpreted in terms of nuclear and physico-chemical reactions sustained by the glauconites in the reactor. These impose severe limitations on the use of glauconite in the 40Ar/39Ar irradiation technique.

Type
Research Article
Information
Geological Magazine , Volume 113 , Issue 4 , July 1976 , pp. 329 - 340
Copyright
Copyright © Cambridge University Press 1976

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