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Message from discussion Reliability of Radiometric Dating
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Chris Stassen  
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 More options Jan 9 1998, 3:00 am
Newsgroups: talk.origins
From: occup...@stassen.com (Chris Stassen)
Date: 1998/01/09
Subject: Re: Reliability of Radiometric Dating
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[Posted and E-mailed]

David Plaisted wrote:
> The reason that this is relevant is that it states that in nearly
> every case, recent lava flows give very old radiometric ages.  

If it makes that claim, it tells a lie.  See for example
Dalrymple (1969), a comprehensive survey of the argon content
of "historic" (observed in modern times) lava flows.  Of
samples from 26 different sources, 25 of them gave results
less than 250,000 years (which is essentially zero to
within measurement accuracy, because it represents an error
of less than 0.0002 half-lives).

The 26th was the oft-misused-by-creationists Hualalei flow,
which is not suitable for K-Ar dating in the first place
because it contains ultramafic inclusions (which were solid
before the flow reached the surface) that carry excess argon.

REFERENCE:

Dalrymple, G.B., 1969.  "40Ar/36Ar Analyses of Historic Lava
Flows" in _Earth and Planetary Science Letters_ vol. 6, pp. 47-55.

--
Chris Stassen                          http://www.stassen.com/chris/
NOTE:  The "Reply-To" address of this message is an auto-bounce.
Use "http://www.stassen.com/chris/feedback/submit.html" for private
or offline responses, if you don't know my real E-mail address.


 
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