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Tim Thompson: Harland et al. (1990, p. 76) further state that the
errors in the decay constants associated with K/Ar dating are on the
order of 0.5%.

 -Once 40Ar is produced by the decay of 40K within a mineral, the
ability of the mineral to retain the argon would depend on the
identity of the mineral and its thermal environment (e.g., Hyndman,
1985, p. 675-676).

 -One of Dr. Plaisted's friends complains (p.11) that rocks in areas
with complex geologic histories tend to have large discordances in
K/Ar dates. This is not unexpected, because rocks with complex
metamorphic and igneous histories could have experienced a number of
heating events. Such events would have released at least some of the
argon from the rocks, which would have produced discordances (see
Dalrymple, 1991, p. 93-94).

J.G. Meert, "More Faulty Creation Science from The Insitutute for Creation
Research, 2000; <http://www.clas.ufl.edu/users/jmeert/index2.html>

-  Although olivine
   may entrap a small amount of excess argon, the structure of the
   mineral makes it useless for conventional K-Ar dating.  It is no
   mystery that minerals such as olivine and pyroxene contain excess
   argon and for this reason, the minerals are avoided by conventional
   scientists.



Chris Stassen

   Copyright C 1994-2003

A Criticism of the
ICR's Grand Canyon Dating Project (talk.origins archive)

RE:    Dr. Steven Austin, chairman of the Geology Department at the
Institute
   for Creation Research, claimed (1992) that he had derived an Rb/Sr
   isochron for the plateau flows, which indicates an age of about 1.3
   billion years.

-    In other words, Austin claims that he has produced a seemingly
   reliable isochron age which must necessarily be wrong, and therefore
   the Rb-Sr isochron dating method, which is considered to be among the
   more reliable of radiometric dating methods, must be considered
   suspect.

(failed to recognize the falicy in this)