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Author Topic:   Your First Ever EVC Post
Coragyps
Member
Posts: 5399
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 23 of 140 (529794)
10-10-2009 2:48 PM


Whew! Memory lane.....

I'm not positive exactly how this factors in, but it's well established in the oilfield industry that pressure can have a very dramatic influence on "permeability" (approximately rate of diffusion) of gases in whole rocks. Measured perms in "tight gas sands" are frequently lower by a factor of 1000 at realistic native confining pressures than at atmospheric pressure. I would think that there should be some sort of analogy between this inter-grain permeability and the diffusivity along crystal defects that would control helium flow out of zircons. I'm not too sure I have the perseverance to look for documentation, though.

I got here from 1) a local letter-to-the-editor debate with a YEC physician, which led to 2) a search for online resources 3) then to Internet Infidels and on to 4) here.


  
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