Understanding through Discussion


Welcome! You are not logged in. [ Login ]
EvC Forum active members: 64 (9023 total)
52 online now:
jar, PaulK, Tangle (3 members, 49 visitors)
Newest Member: Ashles
Post Volume: Total: 882,685 Year: 331/14,102 Month: 331/294 Week: 87/136 Day: 6/33 Hour: 0/3


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
Author Topic:   Your First Ever EVC Post
Coragyps
Member
Posts: 5548
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.


Newer Topic | Older Topic
Jump to:


Copyright 2001-2018 by EvC Forum, All Rights Reserved

™ Version 4.0 Beta
Innovative software from Qwixotic © 2021