Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..59...21m&link_type=abstract
Earth and Planetary Science Letters, Volume 59, Issue 1, p. 21-27.
Other
10
Scientific paper
We have shown that for metamorphosed granites, as well as for metamorphosed sediments, it is possible to obtain a reliable K-Ar age from a sample as small as 0.2 μg. Samples with ages as young as 40 m.y. are easily studied. There is no reason to believe that the method could not be used for samples considerably younger. The main application of the laser will probably be for cases where the same mineral species has been formed during two distinct metamorphic events in the same rock. In this case, it is difficult, if not impossible, to make a mineral separate suitable for a 39Ar-40Ar study. We have shown that in the case of an old granite the biotite in one sample distinctly shows thermal events at 1600 m.y. while its primary cooling age is 2100 m.y. The thermal release study yields a good plateau age, roughly an average age of the two thermal events.
An other interest of this method is demonstrated by argon dating of two different kinds of glaucophane, only one of these showing argon in excess.
Deceased.
Maluski Henri
Schaeffer Oliver A.
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