Diana,
As John suggests, the best way to calculate P-T is from solid-solid
reactions involving common minerals such as gt-plg-qz-hb-opx-cpx (+-
bt-sill-ilm-rt-titanite). Once you have a well-defined P-T, you can use
other equilibria to define fluid component activities if you're
interested.....Rob
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From: Diana Maria Jimenez [SMTP:[log in to unmask]]
Sent: Monday, June 24, 2002 11:23 AM
To: [log in to unmask]
Subject: H2O/CO2 activity in Amphibolite-granulite interphase
I'am working with rocks on the granulite-amphibolite interphase,
closely
associated with migmatites. I am trying to calculated the P-T
conditions
using multi-equilibrium analisys, using the TWQEEU. As I don't have
direct
information on the H2O and CO2 activities, I have some doubts on
have to
proceed, and wich criterias can be usefult to correcly select this
activities. If you can help me with references or some useful
criterias, I
will be really greatful.
Thanks
Diana
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