I'm interested in seeing a cross-section of the
sequence--including ground water conditions) above the granite (also
known to have radiation levels above EPA MCLs).
Gill's prompts me to ask: anybody know where in hell the uranium and radon in
Houston's water comes from? We aren't exactly known for our igneous (or any
other) rock exposures.
Roger again.
-----Original Message-----
From: Gill Edigar <[email protected]>
To: Aimee Beveridge <[email protected]>
Cc: Cavers Texas <[email protected]>
Sent: Wed, Dec 22, 2010 1:48 pm
Subject: Re: [Texascavers] San Saba County/CO2/radon
OK. But I'm interested in seeing a cross-section of the
sequence--including ground water conditions) above the granite (also
known to have radiation levels above EPA MCLs). That granite is pretty
hot, as I understand it, and decomposition of it could be producing a
lot of CO2 & radon. I don't think there would be much geothermal
influence left in the pluton but don't really know that and is one of
the questions I'm looking for somebody to answer. Also, was that area
not part of the Llano Uplift? If not, it is very near it. The caves of
that area have always had a CO2 content higher than other Texas caves
and which would seem to me to be unjustified by the decay of organic
surface material--especially since some caves don't take run off but
still have a lot of CO2.
